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hallard committed Feb 5, 2018
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Expand Up @@ -36,10 +36,13 @@ No specific documentation for now, it's just a kind of wiring helper, please see

You can power the board with 5V going to Raspberry PI USB power directly or connecting 5V to the terminal blocks named VIN/GND, in this case use a descent 5V power supply.

You can also use a Murata DC/DC Step down (see BOM), in this case you can power the board from DC 7V to 36V, this is what I do each time. ~~To use this feature you need to cut the trace on bottom side of PCB that connect VIN to 5V (vout)~~. Since V1.3b+ the trace ifs not connected anymore. This means that Vin and Vout are not connected anymore. So if you don't use DC/DC dans powering with 5V, you need to put some solder on the pad to connect vout to vin (5V).
You can also use a Murata DC/DC Step down (see BOM), in this case you can power the board from DC 7V to 36V, this is what I do each time. ~~To use this feature you need to cut the trace on bottom side of PCB that connect VIN to 5V (vout)~~.

<img src="https://raw.githubusercontent.com/hallard/RAK831-Zero/master/pictures/PiZero-RAK-DCDC.png" alt="Cut Trace to Power with DC DC Step Down">

**Since V1.3b+ the trace is not connected anymore**. This means that Vin and Vout are not connected anymore. So if you don't use DC/DC and powering with 5V, you need to put some solder on the pad to connect vout to vin (5V).


### Pushbutton

The push button is connected between 3V3 and GPIO17. GPIO17 has a 10K pull down to ground so when pressed GPIO17 become High. The button can be soldered on board, or connected to the Terminal Blocks if you want to put an external one if you have the board in a closed enclosure for example.
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