I just receive a Raspberry Pi Zero W and decided to try and throw something together with parts I already have as a sort of proof of concept. I’ve got the RPi Zero W connected to an Arduino Uno Rev. 3 and was able to load "snapshots/trunk/heatermeter.hex" dated Sat Apr 15 2017 to the Uno. Everything is up and running, I’ve even got a servo attached to the Uno. I’m powering the RPi from the 5V pin on the Uno which I’ve got connected to a 9V power supply. I’m using the 3.3V power from the Uno for the probe wiring, and have verified with a meter the 100k resistor and 47K resistor. I have a functional Maverick 732 probe connected, but am getting readings about 115 degrees too high. I tried moving the probe circuit to all four pins on the Uno and they are all reading the same. I have 732 selected in the GUI and have entered a resistance value of 47000 which gets changed to "46999.998" when I apply the changes.
Some other notes:
I’ve tested it with and without the servo connected.
I’m running "LEDE Reboot SNAPSHOT r3799-13006712ea / LuCI Master (git-17.078.53745-180f2d6)"
The 47k resistor isn’t 1%, but it wouldn’t make that significant of a temperature difference.
I’m sure I’m missing something simple here, any assistance would be appreciated.
Thanks,
Jason
Some other notes:
I’ve tested it with and without the servo connected.
I’m running "LEDE Reboot SNAPSHOT r3799-13006712ea / LuCI Master (git-17.078.53745-180f2d6)"
The 47k resistor isn’t 1%, but it wouldn’t make that significant of a temperature difference.
I’m sure I’m missing something simple here, any assistance would be appreciated.
Thanks,
Jason