Schematic about Nano+DRV8825_hw203

Arduino Focuser, fully ASCOM complaint

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Schematic about Nano+DRV8825_hw203

Forum: General Discussion

Creator: bj jones

Created: 2016-01-13

Updated: 2016-05-22

bj jones - 2016-01-13

im building the Nano+DRV8825_hw203
i have a question about diagram what is the unit that is marked with a "K"
its in the lower left corner of the DIAGRAM showing parts loction
it connect to the VIN of the NANO TO GROUND by the 1.2k resitors
i dont see it on the parts list
thanks
bj

Last edit: bj jones 2016-01-13

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bj jones - 2016-01-13

Here is pic im pointing at the area and the schmatic im using im building fullversion less BT IR

Last edit: bj jones 2016-01-13

image.jpeg

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bj jones - 2016-01-13

this is the schematic im using

image.jpeg

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brownrb - 2016-01-14

It is the 9.1v zener diode. The K stands for cathode end (meaning the bar), so tells you how to connect it (which way round).

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bj jones - 2016-01-14

THANK YOU
i have another question about
schematic
RESETSWITCH- SW1/jp12 parts list calls for SPDT switch but there is only 2pins..?
also am i Blind or are the 470 ohm resitors for the LEDs missing from the list ?
THANKS again

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brownrb - 2016-01-14

The reset switch is like this one
Use the center pin and one of the outside pins.
http://www.ebay.com/itm/NEW-20pcs-5V-0-3A-Black-Mini-Size-SPDT-Slide-Switch-On-Off-3-Pin-PCB-for-DIY-/131425000522?hash=item1e998a5c4a:g:yTkAAOSwZjJU2G4d

the 470ohm only if your eleds do not have a pre-wired resistor, so I used these and no need for a 470ohm resistor as the led is prewired
http://www.ebay.com/itm/6V-12V-pre-wired-LED-light-round-top-colorful-RGB-20cm-line-bright-DIY-Model-toy-/161623462632?var=&hash=item25a18252e8:m:mKS-YaDyVwPUisj87Vx4rKA

get the 5-6V ones

To mount the LED on the case, the LED pushes into one of these plastic bezels.
http://www.ebay.com/itm/20-x-3mm-Bezel-LED-Panel-Mounting-Clip-FREE-SHIPPING-/280930962566?hash=item4168ca4c86:g:t6UAAMXQdGJRzJ-B

Note led size and bezel size is 3mm. Drill a hole in the case for the bezel (nice tight fit), push the bezel in place, then push the LED into the bezel, it should stay locked in place, if not, use a hot glue gun to glue it in place and hold it there

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bj jones - 2016-01-15

Thanks again
do i need to jump the pins where the 470 Resistor goes or do i just leave it open ?
If i use the prewires resistors

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brownrb - 2016-01-15

No problem. If using prewired leds, you use a jumoer across the pins -
http://www.ebay.com/itm/50-New-Jumpers-2-54mm-Shunts-CD-DVD-Rom-Hard-Drive-Motherboard-Shunt-1025K-/380837482170?hash=item58abaeceba:m:mP9X6iGXqieUX50YKzsvpLw

ReadMe.txt

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bj jones - 2016-01-19

thanks again
i have question about SW1/JP12 reset
do use a switch or jumper? on the jp12
i see the on/off switch but not sure about the reset switch
how will it be used?

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brownrb - 2016-01-20

The reset switch is the same as the power switch.
You could use a motherboard shunt jumper - closed would mean normal operation, open means you can reprogram with new firmware

When closed it prevents the Arduino from resetting/rebooting when a connect() occurs, this means it can respond quickly.to any serial requests. It is mainly there if you are using a moolite driver to connect (such as under Linux or a Mac)

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brownrb - 2016-01-20

The reset switch is the same as the power switch.
You could use a motherboard shunt jumper - closed would mean normal operation, open means you can reprogram with new firmware

When closed it prevents the Arduino from resetting/rebooting when a connect() occurs, this means it can respond quickly.to any serial requests. It is mainly there if you are using a moolite driver to connect (such as under Linux or a Mac)

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Jamie - 2016-05-22

G'day all,

I am just wondering if the schematic file file for the Nano and DRV8825 is available?
I may have missed it when looking through the various download files.
Just wanting a clearer schematic than what is shown in the pdf description document.

Thanks in advance.

Regards,

Jamie

Found what I was looking for in an updated version; thanks.

Last edit: Jamie 2016-05-22

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