Assembly

This instruction will guide you through the steps to be taken. Below some chapters you find some information about the options. It always starts with Options:. There you find the components that also needs to be solderd to the PCB for your options. And if you are not sure about the name of a part, just look into the BOM.

1. level shifter and passive low profile elements

• At first solder the level shifter (LV1)
• Make sure you solder it the right way (you can orientate on the notch of the level shifter)

• Now solder resistor R3

• And now the diodes D1 and D2

• Make sure you put it the right way (you can orientate on template on the pcb)

• Solder the capacitor C1

Options:

1. C4 and C5
2. R7
3. R5, R6
4. R5, R6
5. R2

2. PTC fuse, headers and power led

• First solder the PTC fuse (F2)

• Now solder the fuse holder (F1)

Wemos D1 mini:

• And now the two headers H1 and H2 ESP32 mini:

• And now the two headers H1, H2, H3 and H4

• Optionally: Solder the power led

Options:

0. -> Bare minimum: Short 5V position
1. 3 pin male
3. 4 pin female
4. 4 pin female
5. 2 pin male
6. Header analog

3. transistor, electrolytic capacitors, buck power converter and sensor

• Solder the transistor Q1 (put it like the template on the pcb)

• And now the capacitors C6 and C2 (pay attention at + and -)

Options:

1. PS1 (jumper select)
2. PS1 (auto select)
3. DS18B20 (or DS18B20+)
4. I2C sensor
5. OLED display

4. relay, terminal blocks

• Solder relay to PCB (K1)

• Finally solder the screw terminal blocks X1 and X2

5. add solder to traces

Add good amount of solder to traces shown in red. For more Amps to flow through.

Fuse and power selector

Now put a fuse into the fuse holder. Before you put the jumper on the power selector, do the next step of the wiki first.

NEXT STEP: Check