Flipper Zero HC-SR501 PIR Proximity Alarm App

Simple proximity alarm app for Flipper Zero using HC-SR501 PIR sensor.
Triggers vibration, LED alerts, and screen notifications. Features 3-second alarm duration with blinking feedback.

Wiring Diagram

HC-SR501 Pin	Flipper Zero Pin	Description
SIG (OUT)	GPIO C0 (Pin 16)	Motion detection signal
VCC	5V (Pin 1)	Power supply (5V)
GND	GND (Pin 8)	Ground

Features

• Motion Detection: HC-SR501 PIR sensor detects human motion within ~7m range
• Multi-Alert System: Vibration motor + LED blinking + screen notification
• Auto-Reset: Returns to idle state after alarm duration

App States

Idle State

• No motion detected
• (Idle state, no motion visual representation removed due to Markdown restrictions)

Alarm State (Active)

• Motion detected, triggers vibration, LED, and screen notification
• (Alarm state visual representation removed due to Markdown restrictions)

Implementation Guide

Required Components:

• Flipper Zero (firmware supporting GPIO input)
• HC-SR501 PIR Motion Sensor
• Jumper wires (female-to-male recommended)
• Optional: 100nF capacitor across VCC-GND for sensor stability

Pin Configuration:

-- GPIO Pin Definitions
local PIR_PIN  = gpio.c0     -- Pin 16 / GPIO C0 (PIR Input)
local POWER_SUPPLY  = gpio.gpioa7 -- Pin 1  / GPIO 5V 
local GND  = gpio.gpiob3 -- Pin 8/18 / GPIO  GND