Aj Sr04m Datasheet Page

Trigger Pulse: 10µs minimum, 20µs typical Cycle Interval: 50ms minimum (20Hz max update rate) Echo Pulse: 150µs (no object) to 38ms (5 meters)

| Feature | AJ-SR04M | HC-SR04 | |---------|----------|---------| | Waterproof | Yes (IP67/IP68) | No (Open PCB) | | Cable | 1m – 2.5m (included) | Pin headers only | | Operating Modes | PWM + UART | PWM only | | Cost | Medium ($8-$15) | Low ($2-$4) | | Outdoor Use | Excellent | Poor (Corrodes quickly) | | Range | 2m – 5m typical | 2m – 4.5m typical | | Current Draw | ~15mA | ~8mA | Aj Sr04m Datasheet