As I read through Charles Gantt's blogs on the Foginator 2000, I saw that he used an off the shelf relay board to switch the fogger on and off. However, I didn't want to spend the money when I could just as easily create my own relay board. So, I sketched up the following schematic. The inputs on the left go to the Raspberry Pi board and the outputs at the top go to the fog machine's remote control.
I pulled the following parts from Seeed Studio's Arduino Starter Kit to build the board. The perf-board was purchased separately.
| Part | Manufacturer | Manufacturer's Part Number |
|---|---|---|
| R1 | Various | Various |
| Q1 | On Semi | P2N2222A |
| D1 | Diodes Inc | 1N4001 |
| RY1 | Tianbo | HJR-4102E-L-05V |
| Perf-board | Radio Shack | N/A |
I assembled the circuit on the perf-board, using the extra component lead lengths to connect the parts together. Then I added wires to connect up to the Raspberry Pi. Using Charles' python code and a PIR sensor from Radio Shack, I was able to successfully switch the relay upon motion. Here's a close-up of the completed board and a picture of the test setup.
Now, I have a relay board of my own creation that I can re-use in future projects when needed!
