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CircuitBench
nodal-analysis circuit simulator
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Blink an LED
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Breadboard basics
Piezo melody
Servo sweep
ESP32 + NeoPixels
LCD + DHT22
Transistor + motor
Ultrasonic distance
Ohm's law divider
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Check wiring
Find floating or miswired pins
Self-test
Run the numerical engine checks
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Fit
Scope · 0–5 V
alt-click a pin to add
sketch.ino
Arduino C++ · runs on the board you place
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SERIAL MONITOR
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