Each OneWire device also has a unique 64-bit registration number (8-bit device type, 48-bit serial number and 8-bit CRC), so multiple slaves can co-exist on the same bus. I'm thinking this is either a dead/dying board or a firmware issue.ĭoes anyone have any suggestions? Can anyone point me to where to flash the nodemcu back to stock in the even that I somehow screwed that up? I found the cloud flash builder but I'm not sure what all needs included to flash it to it's original state. low cost, low transfer rates (up to 16 kbps), fairly long distances (up to 300 meters), small data transfer packages. THere is nothing special to the wiring switching from D4 to D2. Tutorials online show D2 as being perfectly fine with nothing special in the code for this purpose. If I do that using D2 or 4 for the pin the script just acts like it's got nothing attached.

Specifically D2 is the one I'm wanting to make work.

I can also use 2 as the sensor pin as D4 is just a mapping of gpio pin 2. I've made a simple script in arduino ide to read the temperatures from a one-wire ds18b20 using D4 as the sensor pin works just fine. I've got a V1 NODEMCU it says Amica on the bottom.

One wire library arduino