Flipper Zero GPIO: Reading Sensors and Controlling LEDs

Flipper Zero GPIO: Reading Sensors and Controlling LEDs Hands-on GPIO projects that work with the Flipper as a standalone microcontroller platform. Project 1 — Blink an LED Parts: LED, 330Ω resistor Wiring: Flipper GPIO pin (e.g., PA7) → 330Ω resistor → LED anode (+) LED cathode (-) → GND (Pin 2) In Flipper: Apps → GPIO → GPIO Control → Toggle PA7 You should see the LED blink with each toggle. Project 2 — Read a Button Parts: Push button, wire Wiring: One button leg → GPIO pin (e.g., PA4) Other button leg → GND Enable internal pull-up for the pin in the GPIO app. Read: pin is HIGH when button not pressed, LOW when pressed. Project 3 — DHT11 Temperature Sensor Parts: DHT11 or DHT22 temperature/humidity sensor Wiring: VCC → 3.3V (Pin 3) GND → GND (Pin 2) DATA → PA4 App: Search "DHT" in the Flipper App Catalog — community apps exist for this sensor. Project 4 — Control a Relay Parts: 3.3V-compatible relay module Wiring: IN → GPIO pin VCC → 5V (Pin 1, requires USB power) GND → GND Toggle GPIO pin = toggle relay. Use to control mains-powered devices (with appropriate precautions). Project 5 — I2C OLED Display Parts: SSD1306 128×32 or 128×64 OLED Wiring: SCL → PC0 SDA → PC1 VCC → 3.3V GND → GND App: SSD1306 app in community firmware (Momentum includes it). Display custom text or sensor data. Development Tips Always use series resistors on GPIO output pins (100–330Ω to LEDs) Never exceed 3.3V on input pins Current limit: Each GPIO pin max 5mA; total GPIO max ~50mA Test connections with a multimeter before powering up

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