LMS Uart Converter board

Here’s the pinout of the convertor board LMS-uart-convertor pinout

Mounting the ports and headers

I use leadless souldering tin and soldering station at 330ºC. To assemble the ports and the headers, I usually fix one of the pins with some tin on the iron. Then I bend everything in place and solder the other pads. Finally I come back to the first one.

If you mount the black 6 pin ports, be sure to align the slot with the white line printed on the board.

The i2c header is optional. You can use an i2c grove port or a 4 pin header. It will not be connected to any LEGO wire. It exposes i2c pins from the OpenMV or ESP board below.

Configuring the soldering pads

Here’s how to use the soldering pads:

Crimping a Wedo/Power Functions/LPF2 wire

Cable crimping

Assembly

with the pins and ports you want. Be sure to connect the 5v to Vin via a soldering jumper and the 3v3 to Vin in the same way. You can also solder the M1 and M2 jumpers. But be careful when connecting two SPIKE/Robot Inventor hubs once you did that. I’m not sure what will happen.

Next put the breakout board on top the ESP board. You can not break anything if you mount it upside down, but it just won’t work. Make sure the grey NXT port is on the same side as the Wifi chip.