Hello to the Forum. I have had this focuser project in a drawer to use with a remote telescope setup for several years. With time on my hands due to Covid I decided to proceed with the project. I am using an L293D motor sheild on an Arduino Uno and a 28BYJ-48 motor. I programed it in the Arduino IDE with the Focuserv168_L293D_MT firmware and went through the setup in the Windows interface. It all works beautifully. However while the Windows program recognizes the temperature probe, and will return a temperature with the "Get Temp" button, this temperature is 20C and does not change if I hold it in my hand, put it on an ice cube etc. It seems that the 20C is a default and the probe is not returning a measured temperature.
I soldered the probe directly to the L293D board without a connector, red wire to VCC, black to Gnd and yellow to the D2 signal pin, as shown in the documents. Any ideas as to why the probe does not report a temperature? I am using the 9600 baud com port speed. Should I try a different speed? The Board reports that it is connected to Com 4. Everything else is working great so I don't know how to trouble shoot the temp probe. It would be really great to have that working, since this assembly will be used outdoors.
Hello to the Forum. I have had this focuser project in a drawer to use with a remote telescope setup for several years. With time on my hands due to Covid I decided to proceed with the project. I am using an L293D motor sheild on an Arduino Uno and a 28BYJ-48 motor. I programed it in the Arduino IDE with the Focuserv168_L293D_MT firmware and went through the setup in the Windows interface. It all works beautifully. However while the Windows program recognizes the temperature probe, and will return a temperature with the "Get Temp" button, this temperature is 20C and does not change if I hold it in my hand, put it on an ice cube etc. It seems that the 20C is a default and the probe is not returning a measured temperature.
I soldered the probe directly to the L293D board without a connector, red wire to VCC, black to Gnd and yellow to the D2 signal pin, as shown in the documents. Any ideas as to why the probe does not report a temperature? I am using the 9600 baud com port speed. Should I try a different speed? The Board reports that it is connected to Com 4. Everything else is working great so I don't know how to trouble shoot the temp probe. It would be really great to have that working, since this assembly will be used outdoors.
Thanks
Don
Manitoba Canada.
The temp probe requires a 4.7K resistor 1/4 watt is fine, between the SIG and VCC lines in order to work.
Did you forget the resistor?
Last edit: brownrb 2021-02-01
Yes works great now. Thanks