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|---|---|
Pi-Alarm Build Instructions |
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Working with electricity can be dangerous. BUILD THIS PROJECT AT YOUR OWN RISK. Always follow proper safety precautions. Always work under the supervision of a qualified professional. T-MOBILE and other contributors are NOT RESPONSIBLE for the serious injuries and death that can occur.
Though this project can use with a standard power outlet to power the alarm, but that does not mean you should do it that way. For safety sake we recommend using a battery-powered LED light.
| Item | Purpose |
|---|---|
| Raspberry Pi 3 | Hosts the web server to control the relay (switch) |
| HDMI-compatible monitor, wireless keyboard and mouse | Interact with the Pi |
| Ethernet cable | Network/internet connectivity |
| 5VDC Relay switch | Control the power to the light |
| Alarm Light | Indicate when attention is needed (e.g. a broken build) |
| Extension cord | Provide a controllable power outlet |
| Jumper wires | Communication between the Pi and the relay |
| Housing for relay | Wiring safety and organization |
| USB Battery pack (optional) | Power the Pi |
The alarm is powered by a 120V outlet. The relay switch opens and closes the 120V power supply. The relay switch has 3 input controls (+, -, and S). The + and - provide the power to the relay. The S turns the relay on and off. The + pin on the relay connects to Pi pin 4 (5V). The - pin on the relay connects to Pi pin 6 (ground). The S pin on the relay connects to Pi pin 12 (GPIO 18).
