Electronic Notes
This is notes and circuits collected on electronics
HC-SR501 Connections
Connect 5v relay to Arduino
When using a 3.3v CPU, you need to connect the output via a transistor circuit to switch a 5v relay. Use a 1k resistor for R1. BC547 works well for TR1.
ESP12F Circuit for Flashing
12v to 220v 7kW Inverter Circuit
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