From: hypo <hyp...@gm...> - 2009-10-11 06:57:12
|
hi experts, I want to control power to my living room lamp (runs on 110V AC mains) with a verdex xlp. has someone tried something like this before? if so, i'd appreciate any tips and suggestions. here's what i'm thinking of doing: 1. connect one of the GPIO ports to an opto-coupler 2. connect the isolated output of the opto-coupler to driver circuit 3. the driver circuit drives the gate of a power MOSFET that controls the lamp. is this feasible? if so, does anyone have suggestions on any specific parts i could use? esp for the opto-coupler and power MOSFETs? i'm think it has to be able to handle 110V and ~ 2A for continuous operation for at least a few hours at a time. is there a better (= easier, cheaper and safer) approach to doing the same thing? if so, what hardware would i need for that? any guidance on any related topic is more than welcome! thanks a ton! hypo -- View this message in context: http://www.nabble.com/controlling-120v-AC-power-with-gumstix-tp25841120p25841120.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: bahnfire <bah...@ho...> - 2009-10-11 07:17:58
|
I would connect a GPIO to an optocoupler and then a relay. If you have >5 outputs then use a ULN2803. If the load is inductive make sure you use a flyback diode across the load terminals. I used a PCJ-105D3MH SPST-NO relay before for a 1-2A load and it was fine (contact rated to 5A @ 240VAC) and it has a 5VDC coil (needs 40mA, so you will need a mosfet or transistor to switch). Cheers, Paul hypo wrote: > > hi experts, > > I want to control power to my living room lamp (runs on 110V AC mains) > with a verdex xlp. has someone tried something like this before? if so, > i'd appreciate any tips and suggestions. > > here's what i'm thinking of doing: > 1. connect one of the GPIO ports to an opto-coupler > 2. connect the isolated output of the opto-coupler to driver circuit > 3. the driver circuit drives the gate of a power MOSFET that controls the > lamp. > > is this feasible? if so, does anyone have suggestions on any specific > parts i could use? esp for the opto-coupler and power MOSFETs? i'm think > it has to be able to handle 110V and ~ 2A for continuous operation for at > least a few hours at a time. > > is there a better (= easier, cheaper and safer) approach to doing the same > thing? if so, what hardware would i need for that? > > any guidance on any related topic is more than welcome! > > thanks a ton! > hypo > -- View this message in context: http://www.nabble.com/controlling-120v-AC-power-with-gumstix-tp25841120p25841215.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: Benny B. S. <bb...@se...> - 2009-10-11 09:59:43
|
Omit the optocoupler (the relay should be chosen so that it has sufficient isolation voltage between coil and contacts). Connect a GPIO to a driver (e.g. a MOSFET or ULNxxxx) that is able to drive tho coil on the relay (and remember flyback diode on the coil if the driver can't cope with the voltage spike from the coil when switching off) The relay is the simple solution. A single MOSFET won't go on the ac side (a MOSFET has a diode from source to drain) BR Benny bahnfire skrev: > I would connect a GPIO to an optocoupler and then a relay. If you have >5 > outputs then use a ULN2803. If the load is inductive make sure you use a > flyback diode across the load terminals. I used a PCJ-105D3MH SPST-NO relay > before for a 1-2A load and it was fine (contact rated to 5A @ 240VAC) and it > has a 5VDC coil (needs 40mA, so you will need a mosfet or transistor to > switch). > > Cheers, > Paul > > > hypo wrote: > >> hi experts, >> >> I want to control power to my living room lamp (runs on 110V AC mains) >> with a verdex xlp. has someone tried something like this before? if so, >> i'd appreciate any tips and suggestions. >> >> here's what i'm thinking of doing: >> 1. connect one of the GPIO ports to an opto-coupler >> 2. connect the isolated output of the opto-coupler to driver circuit >> 3. the driver circuit drives the gate of a power MOSFET that controls the >> lamp. >> >> is this feasible? if so, does anyone have suggestions on any specific >> parts i could use? esp for the opto-coupler and power MOSFETs? i'm think >> it has to be able to handle 110V and ~ 2A for continuous operation for at >> least a few hours at a time. >> >> is there a better (= easier, cheaper and safer) approach to doing the same >> thing? if so, what hardware would i need for that? >> >> any guidance on any related topic is more than welcome! >> >> thanks a ton! >> hypo >> >> > > |
From: Ryan <gu...@ra...> - 2009-10-11 21:12:33
|
The relay is definitely the simple way to go for on/off. If you want to get 'fancy' look at some simple triac circuits...the software will require a bit more than simple GPIO toggling, but you can implement dimming which is always fun. Regards, Ryan -----Original Message----- From: Benny B. Simonsen [mailto:bb...@se...] Sent: Sunday, October 11, 2009 5:31 AM To: General mailing list for gumstix users. Subject: Re: [Gumstix-users] controlling 120v AC power with gumstix Omit the optocoupler (the relay should be chosen so that it has sufficient isolation voltage between coil and contacts). Connect a GPIO to a driver (e.g. a MOSFET or ULNxxxx) that is able to drive tho coil on the relay (and remember flyback diode on the coil if the driver can't cope with the voltage spike from the coil when switching off) The relay is the simple solution. A single MOSFET won't go on the ac side (a MOSFET has a diode from source to drain) BR Benny bahnfire skrev: > I would connect a GPIO to an optocoupler and then a relay. If you have >5 > outputs then use a ULN2803. If the load is inductive make sure you use a > flyback diode across the load terminals. I used a PCJ-105D3MH SPST-NO relay > before for a 1-2A load and it was fine (contact rated to 5A @ 240VAC) and it > has a 5VDC coil (needs 40mA, so you will need a mosfet or transistor to > switch). > > Cheers, > Paul > > > hypo wrote: > >> hi experts, >> >> I want to control power to my living room lamp (runs on 110V AC mains) >> with a verdex xlp. has someone tried something like this before? if so, >> i'd appreciate any tips and suggestions. >> >> here's what i'm thinking of doing: >> 1. connect one of the GPIO ports to an opto-coupler >> 2. connect the isolated output of the opto-coupler to driver circuit >> 3. the driver circuit drives the gate of a power MOSFET that controls the >> lamp. >> >> is this feasible? if so, does anyone have suggestions on any specific >> parts i could use? esp for the opto-coupler and power MOSFETs? i'm think >> it has to be able to handle 110V and ~ 2A for continuous operation for at >> least a few hours at a time. >> >> is there a better (= easier, cheaper and safer) approach to doing the same >> thing? if so, what hardware would i need for that? >> >> any guidance on any related topic is more than welcome! >> >> thanks a ton! >> hypo >> >> > > ---------------------------------------------------------------------------- -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: hypo <hyp...@gm...> - 2009-10-13 05:35:44
|
thanks for the tips, Paul! very helpful indeed and gives me interesting ideas :) quick q: for > 5 outputs, a single GPIO line won't be able to select a particular output, right? as i understand, they'd all be on or off together. if i wanted to control each of the 5 outputs independently, how would i do that? i know this is different from my original idea, but reading all these replies makes me want to go creative :) thanks! bahnfire wrote: > > I would connect a GPIO to an optocoupler and then a relay. If you have >5 > outputs then use a ULN2803. If the load is inductive make sure you use a > flyback diode across the load terminals. I used a PCJ-105D3MH SPST-NO > relay before for a 1-2A load and it was fine (contact rated to 5A @ > 240VAC) and it has a 5VDC coil (needs 40mA, so you will need a mosfet or > transistor to switch). > > Cheers, > Paul > > > hypo wrote: >> >> hi experts, >> >> I want to control power to my living room lamp (runs on 110V AC mains) >> with a verdex xlp. has someone tried something like this before? if so, >> i'd appreciate any tips and suggestions. >> >> here's what i'm thinking of doing: >> 1. connect one of the GPIO ports to an opto-coupler >> 2. connect the isolated output of the opto-coupler to driver circuit >> 3. the driver circuit drives the gate of a power MOSFET that controls the >> lamp. >> >> is this feasible? if so, does anyone have suggestions on any specific >> parts i could use? esp for the opto-coupler and power MOSFETs? i'm think >> it has to be able to handle 110V and ~ 2A for continuous operation for at >> least a few hours at a time. >> >> is there a better (= easier, cheaper and safer) approach to doing the >> same thing? if so, what hardware would i need for that? >> >> any guidance on any related topic is more than welcome! >> >> thanks a ton! >> hypo >> > > -- View this message in context: http://www.nabble.com/controlling-120v-AC-power-with-gumstix-tp25841120p25867401.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: Matthew B. <ma...@aw...> - 2009-10-13 06:07:59
|
hi hypo what makes you think they would all switch together? perhaps you misread a previous comment or something. the main concept of having separate IO is to have separate states on them all. You can most definitely control them independently. (I hope I'm not patronising you but) You address them by name as GPIO20, GPIO21, etc in the /proc/GPIO/* file structure. I haven't read this whole thread in detail to know how you are planning on setting the control lines, but the guys here can help you with whatever method you prefer. I recently got some very good help with driving them from a user-space application written in C. works great! hope that helps you out Best regards Matt Bowles Embedded Systems Engineer aWma Pty Ltd -----Original Message----- From: hypo [mailto:hyp...@gm...] Sent: Tuesday, 13 October 2009 4:36 PM To: gum...@li... Subject: Re: [Gumstix-users] controlling 120v AC power with gumstix thanks for the tips, Paul! very helpful indeed and gives me interesting ideas :) quick q: for > 5 outputs, a single GPIO line won't be able to select a particular output, right? as i understand, they'd all be on or off together. if i wanted to control each of the 5 outputs independently, how would i do that? i know this is different from my original idea, but reading all these replies makes me want to go creative :) thanks! bahnfire wrote: > > I would connect a GPIO to an optocoupler and then a relay. If you have > >5 outputs then use a ULN2803. If the load is inductive make sure you > use a flyback diode across the load terminals. I used a PCJ-105D3MH > SPST-NO relay before for a 1-2A load and it was fine (contact rated to > 5A @ > 240VAC) and it has a 5VDC coil (needs 40mA, so you will need a mosfet > or transistor to switch). > > Cheers, > Paul > > > hypo wrote: >> >> hi experts, >> >> I want to control power to my living room lamp (runs on 110V AC >> mains) with a verdex xlp. has someone tried something like this >> before? if so, i'd appreciate any tips and suggestions. >> >> here's what i'm thinking of doing: >> 1. connect one of the GPIO ports to an opto-coupler 2. connect the >> isolated output of the opto-coupler to driver circuit 3. the driver >> circuit drives the gate of a power MOSFET that controls the lamp. >> >> is this feasible? if so, does anyone have suggestions on any specific >> parts i could use? esp for the opto-coupler and power MOSFETs? i'm >> think it has to be able to handle 110V and ~ 2A for continuous >> operation for at least a few hours at a time. >> >> is there a better (= easier, cheaper and safer) approach to doing the >> same thing? if so, what hardware would i need for that? >> >> any guidance on any related topic is more than welcome! >> >> thanks a ton! >> hypo >> > > -- View this message in context: http://www.nabble.com/controlling-120v-AC-power-with-gumstix-tp25841120p2586 7401.html Sent from the Gumstix mailing list archive at Nabble.com. ---------------------------------------------------------------------------- -- Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.421 / Virus Database: 270.13.112/2392 - Release Date: 10/12/09 13:01:00 |
From: hypo <hyp...@gm...> - 2009-10-14 08:40:27
|
hi Matthew, no worries and i don't feel patronized because all this is new to me :) i have never used GPIO so any information is really useful. so please don't hold back at all... thanks! hypo Matthew Bowles-2 wrote: > > hi hypo > > what makes you think they would all switch together? perhaps you misread a > previous comment or something. > > the main concept of having separate IO is to have separate states on them > all. You can most definitely control them independently. > (I hope I'm not patronising you but) You address them by name as GPIO20, > GPIO21, etc in the /proc/GPIO/* file structure. > > I haven't read this whole thread in detail to know how you are planning on > setting the control lines, but the guys here can help you with whatever > method you prefer. I recently got some very good help with driving them > from > a user-space application written in C. works great! > > hope that helps you out > > > Best regards > > Matt Bowles > Embedded Systems Engineer > aWma Pty Ltd > > > -----Original Message----- > From: hypo [mailto:hyp...@gm...] > Sent: Tuesday, 13 October 2009 4:36 PM > To: gum...@li... > Subject: Re: [Gumstix-users] controlling 120v AC power with gumstix > > > thanks for the tips, Paul! very helpful indeed and gives me interesting > ideas > :) > > quick q: for > 5 outputs, a single GPIO line won't be able to select a > particular output, right? as i understand, they'd all be on or off > together. > if i wanted to control each of the 5 outputs independently, how would i do > that? i know this is different from my original idea, but reading all > these > replies makes me want to go creative :) > > thanks! > > > > bahnfire wrote: >> >> I would connect a GPIO to an optocoupler and then a relay. If you have >> >5 outputs then use a ULN2803. If the load is inductive make sure you >> use a flyback diode across the load terminals. I used a PCJ-105D3MH >> SPST-NO relay before for a 1-2A load and it was fine (contact rated to >> 5A @ >> 240VAC) and it has a 5VDC coil (needs 40mA, so you will need a mosfet >> or transistor to switch). >> >> Cheers, >> Paul >> >> >> hypo wrote: >>> >>> hi experts, >>> >>> I want to control power to my living room lamp (runs on 110V AC >>> mains) with a verdex xlp. has someone tried something like this >>> before? if so, i'd appreciate any tips and suggestions. >>> >>> here's what i'm thinking of doing: >>> 1. connect one of the GPIO ports to an opto-coupler 2. connect the >>> isolated output of the opto-coupler to driver circuit 3. the driver >>> circuit drives the gate of a power MOSFET that controls the lamp. >>> >>> is this feasible? if so, does anyone have suggestions on any specific >>> parts i could use? esp for the opto-coupler and power MOSFETs? i'm >>> think it has to be able to handle 110V and ~ 2A for continuous >>> operation for at least a few hours at a time. >>> >>> is there a better (= easier, cheaper and safer) approach to doing the >>> same thing? if so, what hardware would i need for that? >>> >>> any guidance on any related topic is more than welcome! >>> >>> thanks a ton! >>> hypo >>> >> >> > > -- > View this message in context: > http://www.nabble.com/controlling-120v-AC-power-with-gumstix-tp25841120p2586 > 7401.html > Sent from the Gumstix mailing list archive at Nabble.com. > > > ---------------------------------------------------------------------------- > -- > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.421 / Virus Database: 270.13.112/2392 - Release Date: > 10/12/09 > 13:01:00 > > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > -- View this message in context: http://www.nabble.com/controlling-120v-AC-power-with-gumstix-tp25841120p25887341.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: bahnfire <bah...@ho...> - 2009-10-14 22:55:39
|
Yes, you would need 1x GPIO line per relay that will need independent triggering. The ULN part can handle up to 8 lines. Cheers! Paul Matthew Bowles-2 wrote: > > hi hypo > > what makes you think they would all switch together? perhaps you misread a > previous comment or something. > > the main concept of having separate IO is to have separate states on them > all. You can most definitely control them independently. > (I hope I'm not patronising you but) You address them by name as GPIO20, > GPIO21, etc in the /proc/GPIO/* file structure. > > I haven't read this whole thread in detail to know how you are planning on > setting the control lines, but the guys here can help you with whatever > method you prefer. I recently got some very good help with driving them > from > a user-space application written in C. works great! > > hope that helps you out > > > Best regards > > Matt Bowles > Embedded Systems Engineer > aWma Pty Ltd > > > -----Original Message----- > From: hypo [mailto:hyp...@gm...] > Sent: Tuesday, 13 October 2009 4:36 PM > To: gum...@li... > Subject: Re: [Gumstix-users] controlling 120v AC power with gumstix > > > thanks for the tips, Paul! very helpful indeed and gives me interesting > ideas > :) > > quick q: for > 5 outputs, a single GPIO line won't be able to select a > particular output, right? as i understand, they'd all be on or off > together. > if i wanted to control each of the 5 outputs independently, how would i do > that? i know this is different from my original idea, but reading all > these > replies makes me want to go creative :) > > thanks! > > > > bahnfire wrote: >> >> I would connect a GPIO to an optocoupler and then a relay. If you have >> >5 outputs then use a ULN2803. If the load is inductive make sure you >> use a flyback diode across the load terminals. I used a PCJ-105D3MH >> SPST-NO relay before for a 1-2A load and it was fine (contact rated to >> 5A @ >> 240VAC) and it has a 5VDC coil (needs 40mA, so you will need a mosfet >> or transistor to switch). >> >> Cheers, >> Paul >> >> >> hypo wrote: >>> >>> hi experts, >>> >>> I want to control power to my living room lamp (runs on 110V AC >>> mains) with a verdex xlp. has someone tried something like this >>> before? if so, i'd appreciate any tips and suggestions. >>> >>> here's what i'm thinking of doing: >>> 1. connect one of the GPIO ports to an opto-coupler 2. connect the >>> isolated output of the opto-coupler to driver circuit 3. the driver >>> circuit drives the gate of a power MOSFET that controls the lamp. >>> >>> is this feasible? if so, does anyone have suggestions on any specific >>> parts i could use? esp for the opto-coupler and power MOSFETs? i'm >>> think it has to be able to handle 110V and ~ 2A for continuous >>> operation for at least a few hours at a time. >>> >>> is there a better (= easier, cheaper and safer) approach to doing the >>> same thing? if so, what hardware would i need for that? >>> >>> any guidance on any related topic is more than welcome! >>> >>> thanks a ton! >>> hypo >>> >> >> > > -- > View this message in context: > http://www.nabble.com/controlling-120v-AC-power-with-gumstix-tp25841120p2586 > 7401.html > Sent from the Gumstix mailing list archive at Nabble.com. > > > ---------------------------------------------------------------------------- > -- > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.421 / Virus Database: 270.13.112/2392 - Release Date: > 10/12/09 > 13:01:00 > > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > -- View this message in context: http://www.nabble.com/controlling-120v-AC-power-with-gumstix-tp25841120p25900246.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: hypo <hyp...@gm...> - 2009-10-13 05:44:43
|
Benny, good point about the MOSFET and AC. Ryan, the dimming is definitely interesting! but not what i want to do right now... though now i'm going to itch till i find something where i can use the dimming / triac ckts. :) any ideas on how i can use the gumstix to control about 5 relays independently? this is a little different from my original idea, but i thought of it while replying to Pete. thanks! hypo gumstick wrote: > > The relay is definitely the simple way to go for on/off. If you want to > get > 'fancy' look at some simple triac circuits...the software will require a > bit > more than simple GPIO toggling, but you can implement dimming which is > always fun. > > Regards, > Ryan > > -----Original Message----- > From: Benny B. Simonsen [mailto:bb...@se...] > Sent: Sunday, October 11, 2009 5:31 AM > To: General mailing list for gumstix users. > Subject: Re: [Gumstix-users] controlling 120v AC power with gumstix > > Omit the optocoupler (the relay should be chosen so that it has > sufficient isolation voltage between coil and contacts). Connect a GPIO > to a driver (e.g. a MOSFET or ULNxxxx) that is able to drive tho coil on > the relay (and remember flyback diode on the coil if the driver can't > cope with the voltage spike from the coil when switching off) > The relay is the simple solution. A single MOSFET won't go on the ac > side (a MOSFET has a diode from source to drain) > > BR > Benny > > > > bahnfire skrev: >> I would connect a GPIO to an optocoupler and then a relay. If you have >5 >> outputs then use a ULN2803. If the load is inductive make sure you use a >> flyback diode across the load terminals. I used a PCJ-105D3MH SPST-NO > relay >> before for a 1-2A load and it was fine (contact rated to 5A @ 240VAC) and > it >> has a 5VDC coil (needs 40mA, so you will need a mosfet or transistor to >> switch). >> >> Cheers, >> Paul >> >> >> hypo wrote: >> >>> hi experts, >>> >>> I want to control power to my living room lamp (runs on 110V AC mains) >>> with a verdex xlp. has someone tried something like this before? if so, >>> i'd appreciate any tips and suggestions. >>> >>> here's what i'm thinking of doing: >>> 1. connect one of the GPIO ports to an opto-coupler >>> 2. connect the isolated output of the opto-coupler to driver circuit >>> 3. the driver circuit drives the gate of a power MOSFET that controls >>> the >>> lamp. >>> >>> is this feasible? if so, does anyone have suggestions on any specific >>> parts i could use? esp for the opto-coupler and power MOSFETs? i'm think >>> it has to be able to handle 110V and ~ 2A for continuous operation for >>> at >>> least a few hours at a time. >>> >>> is there a better (= easier, cheaper and safer) approach to doing the > same >>> thing? if so, what hardware would i need for that? >>> >>> any guidance on any related topic is more than welcome! >>> >>> thanks a ton! >>> hypo >>> >>> >> >> > > > ---------------------------------------------------------------------------- > -- > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > -- View this message in context: http://www.nabble.com/controlling-120v-AC-power-with-gumstix-tp25841120p25867464.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: Mark A. <m_a...@co...> - 2009-10-13 12:42:50
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Just a thought about this Hypo, but SparkFun Electronics makes some pretty nice looking relay boards which you could then attach to a Gumstix. They should have the drivers and all - or you could just roll your own. best, 'mark hypo wrote: > Benny, > > good point about the MOSFET and AC. > > Ryan, > > the dimming is definitely interesting! but not what i want to do right > now... though now i'm going to itch till i find something where i can use > the dimming / triac ckts. :) > > any ideas on how i can use the gumstix to control about 5 relays > independently? this is a little different from my original idea, but i > thought of it while replying to Pete. > > thanks! > hypo > > > gumstick wrote: > >> The relay is definitely the simple way to go for on/off. If you want to >> get >> 'fancy' look at some simple triac circuits...the software will require a >> bit >> more than simple GPIO toggling, but you can implement dimming which is >> always fun. >> >> Regards, >> Ryan >> >> -----Original Message----- >> From: Benny B. Simonsen [mailto:bb...@se...] >> Sent: Sunday, October 11, 2009 5:31 AM >> To: General mailing list for gumstix users. >> Subject: Re: [Gumstix-users] controlling 120v AC power with gumstix >> >> Omit the optocoupler (the relay should be chosen so that it has >> sufficient isolation voltage between coil and contacts). Connect a GPIO >> to a driver (e.g. a MOSFET or ULNxxxx) that is able to drive tho coil on >> the relay (and remember flyback diode on the coil if the driver can't >> cope with the voltage spike from the coil when switching off) >> The relay is the simple solution. A single MOSFET won't go on the ac >> side (a MOSFET has a diode from source to drain) >> >> BR >> Benny >> >> >> >> bahnfire skrev: >> >>> I would connect a GPIO to an optocoupler and then a relay. If you have >5 >>> outputs then use a ULN2803. If the load is inductive make sure you use a >>> flyback diode across the load terminals. I used a PCJ-105D3MH SPST-NO >>> >> relay >> >>> before for a 1-2A load and it was fine (contact rated to 5A @ 240VAC) and >>> >> it >> >>> has a 5VDC coil (needs 40mA, so you will need a mosfet or transistor to >>> switch). >>> >>> Cheers, >>> Paul >>> >>> >>> hypo wrote: >>> >>> >>>> hi experts, >>>> >>>> I want to control power to my living room lamp (runs on 110V AC mains) >>>> with a verdex xlp. has someone tried something like this before? if so, >>>> i'd appreciate any tips and suggestions. >>>> >>>> here's what i'm thinking of doing: >>>> 1. connect one of the GPIO ports to an opto-coupler >>>> 2. connect the isolated output of the opto-coupler to driver circuit >>>> 3. the driver circuit drives the gate of a power MOSFET that controls >>>> the >>>> lamp. >>>> >>>> is this feasible? if so, does anyone have suggestions on any specific >>>> parts i could use? esp for the opto-coupler and power MOSFETs? i'm think >>>> it has to be able to handle 110V and ~ 2A for continuous operation for >>>> at >>>> least a few hours at a time. >>>> >>>> is there a better (= easier, cheaper and safer) approach to doing the >>>> >> same >> >>>> thing? if so, what hardware would i need for that? >>>> >>>> any guidance on any related topic is more than welcome! >>>> >>>> thanks a ton! >>>> hypo >>>> >>>> >>>> >>> >>> >> ---------------------------------------------------------------------------- >> -- >> Come build with us! The BlackBerry(R) Developer Conference in SF, CA >> is the only developer event you need to attend this year. Jumpstart your >> developing skills, take BlackBerry mobile applications to market and stay >> ahead of the curve. Join us from November 9 - 12, 2009. Register now! >> http://p.sf.net/sfu/devconference >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> >> >> >> ------------------------------------------------------------------------------ >> Come build with us! The BlackBerry(R) Developer Conference in SF, CA >> is the only developer event you need to attend this year. Jumpstart your >> developing skills, take BlackBerry mobile applications to market and stay >> ahead of the curve. Join us from November 9 - 12, 2009. Register now! >> http://p.sf.net/sfu/devconference >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> >> >> > > |