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hestia/PCB Notes.md
Skylar Grant 91b87d566d Add KiCAD Files
2024-10-28 12:39:30 -04:00

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New Relay Layout

                   12VDC Power Supply
                    |

Exhaust--------SSR-40DA-|-----------------NC 3V Relay--------GPIO |
Igniter--------SSR-40DA-|-----------------NO 3V Relay--------GPIO | Auger----------SSR-40DA-|-----------------NO 3V Relay--------GPIO | GND

Power Supply

Flyback Diode (for DC coils)

Purpose: Protects other components from the inductive voltage spike generated when the relay’s coil is de-energized. This voltage spike can damage transistors or other switching components. Type: A simple 1N4007 diode or similar can be used. Placement: Connect the diode across the relay coil, with the cathode (striped side) to the positive voltage and the anode to the negative end of the coil.

Capacitor (for Noise Suppression)

Purpose: A capacitor can be added across the relay contacts to reduce arcing and noise caused by contact bounce, which can help reduce wear. Type: Use a ceramic or film capacitor, typically around 0.1 µF, rated for the expected voltage. Placement: Place the capacitor across the relay’s switching contacts. For high-voltage AC circuits, ensure the capacitor is rated accordingly (e.g., X2 type for AC line).