Raspberry Pi: GPIO with Python and gpiozero, the right way
Wire an LED and a button to a Raspberry Pi's GPIO and control them from Python using gpiozero. The simplest way to get started with physical computing on the Pi.
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#gpio
9 tutorials
ESP32: the boot button and boot pins, what they actually do
The BOOT button on most ESP32 boards is not a reset button. It puts the chip in download mode. Here is what that means and why you keep needing it.
ESP32: GPIO basics, digital read, digital write, and the pull-up trick
How to read and write the ESP32's GPIO pins, when to use the internal pull-ups, and the input-only pins that catch everyone once.
ESP32: add 16 GPIO pins with the MCP23017 I2C port expander
Run out of GPIO on your ESP32? The MCP23017 adds 16 GPIO pins over I2C using only 2 wires. Multi-platform code for ESP32, Arduino, Pico, and Pi.
ESP32: drive a 74HC595 shift register for 8 extra output pins
Add 8 output pins to your ESP32 using only 3 GPIO pins and a 74HC595 shift register. For LEDs, relay arrays, and 7-segment without a driver.
ESP32: read buttons and debounce them in software
Wire a button to an ESP32 and write the debounce code that keeps your state from flickering. Includes the pattern I use in every project.
ESP32: use the onboard touch pins as buttons
The ESP32 has 10 capacitive touch pins that work without any extra hardware. Wire a piece of foil and you have a button.
Raspberry Pi: read a DHT22 with Python and the GPIO pins
Wire a DHT22 to a Raspberry Pi's GPIO and read temperature and humidity from Python. The smallest useful Pi project.
Arduino: blink an LED (the classic first project)
The minimum Arduino sketch. Blink the onboard LED on pin 13. If you have never programmed an Arduino, start here.