I've just finished building the solderless version with the same specs as the pdf using a NEMA17-PG27 and IR remote, and all seems to be working well as intended with the myFP2_DRV8825HW203_299 firmware.
Is it possible to add a second temperature probe and also offset it? I'm not familiar with Arduino coding however I wouldn't mind delving into it if it is in fact possible to do in the first place.
The aim of the first temperature probe in this build is to measure the temperature of my Dobs mirror, whilst the aim of a second temperature probe (if possible) would be to measure the atmospheric temperature somewhere away from the mirror. Ideally, both temperatures and a delta T would be displayed on the OLED so that I would know when to turn down/off the cooling fan behind the mirror. This setup is purely for visual use and temperature compensation will not be required.
I could just use an external thermometer and manually place it somewhere outside the scope of course, but I like the idea of having an all in one solution, plus the DS18B20 are well priced.
Cheers,
James
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Hi James
Technically possible but I think its a bad idea for a number of reasons
1. The code itself managing two probes in not trivial. It is easier if the probes are never unplugged or swapped. Each probe is referenced by an ID, and if perhaps you swapped for another probe then it can stop working. To overcome all of that is moderately difficult
2. ASCOM only supports 1 probe. You could not see the 2nd probe in ASCOM, The purpose of the probe in ASCOM is to do temperature compensation
3. The code my myFP2 is pretty much at its limit right now, there is little hope of adding something new
why not just build a nano and mosfet and ds18b20 to control the fan behind the mirror. That would be simpler than trying to modify myp2.
The dew controller project does fan control and well as automatic dew control using dew straps.
Regards
Robert
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi Robert,
I've just finished building the solderless version with the same specs as the pdf using a NEMA17-PG27 and IR remote, and all seems to be working well as intended with the myFP2_DRV8825HW203_299 firmware.
Is it possible to add a second temperature probe and also offset it? I'm not familiar with Arduino coding however I wouldn't mind delving into it if it is in fact possible to do in the first place.
The aim of the first temperature probe in this build is to measure the temperature of my Dobs mirror, whilst the aim of a second temperature probe (if possible) would be to measure the atmospheric temperature somewhere away from the mirror. Ideally, both temperatures and a delta T would be displayed on the OLED so that I would know when to turn down/off the cooling fan behind the mirror. This setup is purely for visual use and temperature compensation will not be required.
I could just use an external thermometer and manually place it somewhere outside the scope of course, but I like the idea of having an all in one solution, plus the DS18B20 are well priced.
Cheers,
James
Hi James
Technically possible but I think its a bad idea for a number of reasons
1. The code itself managing two probes in not trivial. It is easier if the probes are never unplugged or swapped. Each probe is referenced by an ID, and if perhaps you swapped for another probe then it can stop working. To overcome all of that is moderately difficult
2. ASCOM only supports 1 probe. You could not see the 2nd probe in ASCOM, The purpose of the probe in ASCOM is to do temperature compensation
3. The code my myFP2 is pretty much at its limit right now, there is little hope of adding something new
why not just build a nano and mosfet and ds18b20 to control the fan behind the mirror. That would be simpler than trying to modify myp2.
The dew controller project does fan control and well as automatic dew control using dew straps.
Regards
Robert
Hi Robert,
Thanks for the clairifaction. I hadn't really considered building an another project but if it's simpler as you say then I'll look into it further.
James