Are the pinouts of the screw terminal block on the emonTx documented anywhere?
I’ve looked on EmonTx V3.4 - OpenEnergyMonitor Wiki and on EmonTx V3 - OpenEnergyMonitor Wiki but they both seem to have incomplete lists of the pin assignments:
Screw terminal pin | Connection |
---|---|
1 | 5V (if powered via 5V USB) |
2 | 3.3V |
3 | GND |
4 | IRQ 0 / Dig2 |
Screw terminal pin | DS18B20 Connection |
---|---|
3 - GND | GND (Black) |
5 - Dig19 | Power (Red) |
6 - Dig5 | Data (White) |
Firstly, am I correct in assuming that these two lists document subsets of the same overall pin assignment list?
Then, am I right that pin 5 is 3.3 V? And that pin 1 has 5 V available iff there is a USB power supply? And that I could connect a DS18B20 daisy-chain to pins 1, 3 and 6 to use 5 V as recommended by Maxim on https://www.maximintegrated.com/en/app-notes/index.mvp/id/148 ? Or would that cause problems for the input?
Edit: the post from albundy in the discussion at
DS18B20 Max Distance - Raspberry Pi Forums may be relevant.