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M1 board connect with multi DS18B20 temperature sensors by one GPIO
#1
the photo have connect with "SDA" pin on M1 board, actually you can also use "SCL" pin, these two i2c pins both have pull-up resistance on PCB.
then you can config it by ESPHome, after download firmware will found all scaned DS18B20, remember the sensor's address replace in yaml file.
   
   
   
   
ESPHome yaml file download:

.txt   M1-home-assistant-ds18b20-use_SDA_pin.txt (Size: 1.09 KB / Downloads: 28)
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