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