Hi
I recently bought a C11 Edge HD 2nd hand. It came with the dew heater ring. I understand that I can use the controller to power the dew heater but is there any way of using the thermistor it comes with. A friend of mine is actually writing software for the very expensive Celestron controller and he says that it's a true thermistor. He writes that "I've got a ring and a stand alone thermistor supplied by them, it's resistance is about 11k at room temperature (20C) decreasing as the temperature increases".
Thanks
Tim
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Hi Tim
I have not kept up with Celestron offerings to date. However, there is nothing stopping users to write code to use a thermistor instead of the ds18b29 probe.
I do not know what a "true" thermistor is. But I am familiar with thermistor data sheets etc and have used them with various boards etc. Most data sheets have an RT table, for deriving the temperature from the measured resistive value of the thermistor, or by applying the Steinhart-Hart Thermistor Equation to derive the temperature.
I am a bit curious as to the probe socket used on the Celestron dew controller though. I would hope it is not some type of audio 3pin connector though.
I have no plans to update the myDCP3 project at this time, but I am current working through code changes to the myDCP4ESP32 project.
regards
Robert
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hi
I recently bought a C11 Edge HD 2nd hand. It came with the dew heater ring. I understand that I can use the controller to power the dew heater but is there any way of using the thermistor it comes with. A friend of mine is actually writing software for the very expensive Celestron controller and he says that it's a true thermistor. He writes that "I've got a ring and a stand alone thermistor supplied by them, it's resistance is about 11k at room temperature (20C) decreasing as the temperature increases".
Thanks
Tim
Hi Tim
I have not kept up with Celestron offerings to date. However, there is nothing stopping users to write code to use a thermistor instead of the ds18b29 probe.
I do not know what a "true" thermistor is. But I am familiar with thermistor data sheets etc and have used them with various boards etc. Most data sheets have an RT table, for deriving the temperature from the measured resistive value of the thermistor, or by applying the Steinhart-Hart Thermistor Equation to derive the temperature.
For a simplistic example,
https://learn.adafruit.com/thermistor/using-a-thermistor
I am a bit curious as to the probe socket used on the Celestron dew controller though. I would hope it is not some type of audio 3pin connector though.
I have no plans to update the myDCP3 project at this time, but I am current working through code changes to the myDCP4ESP32 project.
regards
Robert