/ pinouts
Microcontroller pinout reference
Every pin on every popular maker board — function, alternate roles, and the gotchas that catch beginners. Free, no signup.
Espressif ESP32
ESP32 DevKit V1
30-pin Wi-Fi + Bluetooth dev board pinout reference
View pinout
Arduino AVR
Arduino Uno R3
The classic 14-digital, 6-analog ATmega328P pinout
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Arduino AVR
Arduino Nano
The breadboard-friendly 30-pin ATmega328P
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Espressif ESP32-C3
ESP32-C3 Super Mini
Tiny 13×18 mm RISC-V Wi-Fi + BLE board
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Espressif ESP8266
ESP8266 NodeMCU
The original cheap Wi-Fi dev board — 30-pin NodeMCU v1.0
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Espressif ESP32
ESP32-CAM (AI-Thinker)
ESP32 with OV2640 camera and microSD — but no USB
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Arduino AVR
Arduino Mega 2560
54 digital pins, 16 analog inputs, 4 hardware UARTs
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Raspberry Pi
Raspberry Pi 5 GPIO
40-pin GPIO header for Pi 5, Pi 4, Pi 3, Zero 2 W
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