Pinouts & datasheets
for makers

Espressif · ESP32-WROOM-32

Espressif's reference ESP32 dev board: an ESP32-WROOM-32 module on a 38-pin breadboard-friendly carrier with USB-serial and auto-reset. 3.3V logic; most GPIOs are multiplexed (ADC, touch, SPI, I2C, UART, PWM via any pin).

Espressif · ESP8266 (ESP-12E)

The NodeMCU is a popular ESP8266 (ESP-12E) Wi-Fi dev board with a USB-serial bridge and breadboard-friendly headers. Its silkscreen 'Dx' labels map to specific GPIOs (e.g. D1=GPIO5, D2=GPIO4). Logic is 3.3V; VIN accepts 5V.

Raspberry Pi · Broadcom BCM2712

The Raspberry Pi 5 features a 64-bit quad-core Arm Cortex-A76 processor and improved I/O capabilities.

Raspberry Pi · RP2040

Raspberry Pi Pico is a compact microcontroller board featuring the RP2040 chip with 2MB Flash and 264KB SRAM. It offers 26 GPIOs, including 3 ADC-capable pins, and flexible power options from 1.8V to 5.5V, outputting 3.3V logic.

STMicroelectronics · STM32F103C8T6

The 'Blue Pill' is a low-cost STM32F103C8T6 (Cortex-M3, 72 MHz) dev board with two 20-pin headers and a 4-pin SWD header. 3.3V logic (most pins 5V-tolerant). Rich peripherals: 3x USART, 2x SPI, 2x I2C, CAN, USB, and 10 ADC channels.

NXP

13.56 MHz RFID reader/writer module built on the NXP MFRC522. Reads and writes MIFARE tags over SPI (also supports I2C/UART on the chip). Runs at 3.3V — do not power from 5V.

Generic

The common 0.96-inch 128x64 monochrome OLED module driven by the SSD1306 controller over I2C. Four pins; default I2C address 0x3C. No backlight (self-emissive), readable at wide angles.

NE555 · Texas Instruments

The NE555 is a versatile precision timer IC capable of producing accurate time delays or oscillations. It supports monostable and astable modes, adjustable duty cycles, and TTL-compatible outputs.

SN74HC595 · Texas Instruments

The 74HC595 is an 8-bit serial-in, parallel-out shift register with an 8-bit D-type storage register and 3-state outputs. It operates from 2V to 6V, providing a flexible way to expand output pins.

L298N · STMicroelectronics

The L298N is a dual full-bridge (H-bridge) driver that runs two DC motors or one bipolar stepper, each direction-controlled with two inputs and speed-controlled by PWM on the enable pin. The common module adds an onboard 5V regulator.

HC-SR04 · generic

The HC-SR04 Ultrasonic Distance Sensor measures distances from 2cm to 400cm with an accuracy of up to 3mm using ultrasonic waves.

DHT22 · Aosong

The DHT22 (AM2302) is a low-cost digital sensor that measures relative humidity and temperature. It features a calibrated digital signal output, long-term stability, and a single-bus communication interface, making it suitable for various applications.

MPU-6050 · InvenSense

The MPU-6050 is a 6-axis IMU that combines a 3-axis gyroscope and accelerometer with an onboard digital motion processor for sensor fusion.

Connector

The 24-pin reversible USB connector — power, USB 2.0, SuperSpeed, and configuration.