-- but is there a trick to ensure that the temperature probe is reliable recognised ?
I ask, as I've just updated my 5 boards, all ok (DRV88252HW203_303 with Arduino 1.8.19 and supplied libraries) and with a basic config (TempProbe, PB_Steps, in/out leds, buzzer)
But on bench testing, with 2.5.1.1 etc., the basic functionality works as expected, even temperature changes are displayed in the Temperature tab, BUT, its very hit and miss whether the "Probe found" has a tick or not.
When it does, then Temperature compensation works as expected, else not.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
-- but is there a trick to ensure that the temperature probe is reliable recognised ?
If there is, I would like to know also, just curious, I do not have any issues though. Focuser unit still going strong since 2016.
I have added the myFP2 FAQ which does list some info on temperature probes.
the connector that is used for the temp probe is often the cause of problems., under no circumstances use a 3p audio type connector, not only can a short occur when removing or inserting the connector with power on. The minute contact for the 3p connector (surface area) means that the contacts can weld together over time. And then the contacts will break when the probe is removed.
I prefer the 3p 12mm aviation connector which is waterproof and works very well.
Cable length is important - 1m is good, 2m is probably the maximum, have never tried above 2m in length.
I never swap probes around between focusers. Each probe has a unique number tp address that identifies the probe. So when the probe is swapped out for another, that can cause issues (hence the rule in using the myDewController and probes).
Not sure about the cold weather, I have had the problems working when below 0 celcius - the specs say It has an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C
In general I have never seen a probe go bad. The connection of the probe to focuser is where the highest number of reported issues occur. As well as the soldering of the wires to the connector.
In these projects you will see that the probe is never operated in non-parasitic mode. The 3 wires VCC, GND and Sig are used. In parasitic mode, VCC and SIG are combined. make sure that the connection you use is the 3 wire non-parasitic is used, with SIG has a 4.7K pullup resistor to VCC.
make sure that you are using the latest one wire library (2.3.7 I am using) https://github.com/PaulStoffregen/OneWire
You can also use the DS18x20_Temperature example to extract some good info
Thanks for the update, I'll start working my way through your suggestions...
But just for your info, I'm using the same version OneWire library, the connectors I use are all the better quality gold plated versions, ensureing good connectivity etc. and I've also married up the probes to driver modules, and none of the cable lengths are over 1.5m, and I never connect power/USB until the probe/motor are connected...
Yours
Julian
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
-- but is there a trick to ensure that the temperature probe is reliable recognised ?
I ask, as I've just updated my 5 boards, all ok (DRV88252HW203_303 with Arduino 1.8.19 and supplied libraries) and with a basic config (TempProbe, PB_Steps, in/out leds, buzzer)
But on bench testing, with 2.5.1.1 etc., the basic functionality works as expected, even temperature changes are displayed in the Temperature tab, BUT, its very hit and miss whether the "Probe found" has a tick or not.
When it does, then Temperature compensation works as expected, else not.
Hi
If there is, I would like to know also, just curious, I do not have any issues though. Focuser unit still going strong since 2016.
I have added the myFP2 FAQ which does list some info on temperature probes.
the connector that is used for the temp probe is often the cause of problems., under no circumstances use a 3p audio type connector, not only can a short occur when removing or inserting the connector with power on. The minute contact for the 3p connector (surface area) means that the contacts can weld together over time. And then the contacts will break when the probe is removed.
I prefer the 3p 12mm aviation connector which is waterproof and works very well.
Cable length is important - 1m is good, 2m is probably the maximum, have never tried above 2m in length.
I never swap probes around between focusers. Each probe has a unique number tp address that identifies the probe. So when the probe is swapped out for another, that can cause issues (hence the rule in using the myDewController and probes).
Not sure about the cold weather, I have had the problems working when below 0 celcius - the specs say
It has an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C
In general I have never seen a probe go bad. The connection of the probe to focuser is where the highest number of reported issues occur. As well as the soldering of the wires to the connector.
In these projects you will see that the probe is never operated in non-parasitic mode. The 3 wires VCC, GND and Sig are used. In parasitic mode, VCC and SIG are combined. make sure that the connection you use is the 3 wire non-parasitic is used, with SIG has a 4.7K pullup resistor to VCC.
make sure that you are using the latest one wire library (2.3.7 I am using)
https://github.com/PaulStoffregen/OneWire
You can also use the DS18x20_Temperature example to extract some good info
Hope that some of the above helps
Regards
Robert
Hi Robert,
Thanks for the update, I'll start working my way through your suggestions...
But just for your info, I'm using the same version OneWire library, the connectors I use are all the better quality gold plated versions, ensureing good connectivity etc. and I've also married up the probes to driver modules, and none of the cable lengths are over 1.5m, and I never connect power/USB until the probe/motor are connected...
Yours
Julian