Solder socket headers to the PiCowbell. You can use the Pico W as a jig to keep the headers secure.

Solder the 4.7K ohm resistor for the DS18B20 from the 3V line to GP6 on the PiCowbell. Then, solder a 220 ohm resistor from GP10 to one of the prototyping rails on the PiCowbell.

Cut the JST cable in half. Splice and tin the wires on the socket end of the cable.

Solder the black wire of the JST cable to the GND pin on the PiCowbell. Solder the red wire of the JST cable to the prototyping rail connected to the 220 ohm resistor.

Tin the three wires of the DS18B20. Blue is ground, yellow is data and red is power.

Solder the DS18B20 to the PiCowbell.

• Blue wire to PiCowbell GND
• Red wire to PiCowbell 3V
• Yellow wire to the prototyping rail next to GP6

Bridge the solder joints from the 4.7K ohm resistor on GP6 to the DS18B20 yellow wire.

That completes the PiCowbell wiring.

Take the remaining plug end of the JST cable and slip a piece of heat shrink over each of the wires.

Solder the LED cathode to the black wire on the JST cable. Solder the LED anode to the red wire on the JST cable.

Apply the heat shrink over the LED legs and the solder connections.

Plug the LED JST cable into the JST socket and plug the Pico W into the PiCowbell. That completes all of the wiring!