ESP32 will not detect DS18B20

vitotai / BrewPiLess

Use an ESP8266 to replace RPI and Arduino. Running BrewPi without Pi, therefore, BrewPi-Less

349 stars 131 forks source link

ESP32 will not detect DS18B20 #410

Closed BartPichola closed 6 months ago

BartPichola commented 6 months ago

I have an issue with 4.3.1 not detecting DS18B20 on ESP32 board. It will not pull up the sensor on any pin.

I have tried multiple known good probes.
Sensor works fine on ESP8266 board with v4.3.1
Sensor works fine on the same ESP32 board with a simple OneWire Arduino sketch
DS18B20 sensor is wired in normal mode (not parasite)
Voltage checks good (3.3v)
4.7K resistor checks good Any ideas?

vitotai commented 6 months ago

My ESP32 working setup works fine. Which PIN do you use?

BartPichola commented 6 months ago

I've tried all available pins. Most testing was done on pin 27. I've ordered new probes and a couple of new ESP32 boards. I'll test when they arrive and I'll report back.

vitotai commented 6 months ago

The default OneWirePin is 23. I bet you know what you are doing, so good luck. BTW, make sure your sensors are not parasite mode. BrewPi, and hence BrewPiLess, doesn't support parasite mode sensors. Google for more information.

BartPichola commented 6 months ago

ok, I got a set of new probes and they work. BrewPi detected right away. I'm assuming that all 3 of the probes I had are either defective or not built to spec. Turns out to be a hardware issue. Thanks for your help.