Hsb133 Receiver

Place a magnetic reed switch and a 433MHz transmitter on your garage door. When the door opens, the transmitter sends a "1". The hsb133 inside your home receives it and lights up an LED. This is cheaper than Wi-Fi IoT solutions and does not rely on an internet connection.

The HSB133 is typically implemented as a single-conversion superheterodyne receiver. A block diagram consists of:

Here is a simple code snippet to read data from an HSB133 using an Arduino Uno. This assumes the transmitter is sending a simple 2-second high pulse. hsb133 receiver

Wiring: HSB133 VCC → Arduino 5V; GND → GND; DATA → Pin 2.

// Simple receiver sketch for HSB133
const int rxPin = 2;
int lastState = LOW;
unsigned long lastTrigger = 0;
void setup() 
Serial.begin(9600);
pinMode(rxPin, INPUT);
Serial.println("HSB133 Receiver Ready");
 Place a magnetic reed switch and a 433MHz
void loop() 
int state = digitalRead(rxPin);
// The HSB133 output is normally high (idle) and goes low (active) when a signal is received.
if (state == LOW && lastState == HIGH) 
// Debounce (avoid multiple triggers from the same signal)
if (millis() - lastTrigger > 500) 
Serial.println("SIGNAL DETECTED!");
lastTrigger = millis();
lastState = state;
 void loop() int state = digitalRead(rxPin); // The