Hardware
Building tutorial summary
Low component's boards soldering
Take now the Arduino, the SD card reader and the charging board :
Place the Arduino board like the image below. Don’t apply too much strength ! If you can’t insert the board check if there is some bended pins.
Next place the SD card reader and the charging board like this :
Make sure all the boards are flat on the PCB.
Solder just one pin of the Arduino board, check the placement and solder the opposite pin.
Solder the other pins. Be very careful ! Don’t forget some of them.
Same thing on the SD card reader and the charging board. Solder one pin, check placement and solder the other pins.