Solder in the microprocessor ensuring its orientation is as shown.
Solder in the 3v3 regulator.
Solder in the two push buttons.
Solder in the 5 LED’s. The green led is for power indication. Ensure that the short lead goes to the square plated hole.
Solder in the 4 x 220 Ohm (Red,Red Brown) resistors.
Solder in the 4 x 100 Ohm (Brown,Black brown) resistors.
Solder in the 4 x 330 Ohm (Orange,Orange brown) resistors.
Solder in the four diodes, ensure that the white ring (cathode) on the diode goes to the square pad on the PCB
Solder in the two capacitors, match the white stripe (-ve) up with the white semicircle on the PCB ident.
Solder in the on/off Switch
Solder in the two 100nF capacitors and the 4 solenoid plugs(horizontal). Solder in the power connector plug (vertical)
Solder in the 4 MOSFETs ensure that they match PCB ident and are all the same way around.