Builds: every letsBug electronics build

Electronics builds with the ESP32: the circuit, the resistor maths and the code. Each post goes with a letsBug video.

1. ESP32 LED blink: code, circuit and the resistor you need: ESP32 LED blink for beginners: wire an LED to GPIO 23, work out the resistor with Ohm's law, upload the Arduino code, and skip the risky pins.

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