Ultrasonic Ranging Sensor HYSRF04
The SRF04 sonar range finder is a single-transducer ranging module with a 2-pin serial interface. With a range from 3cm to 3m (or 1.2" to 9.8ft), it’s ideal for situations that require accurate ranging information. This ultrasonic rangefinder uses a short blanking interval (100 microseconds) to cut down on noise from the initial ping. It’s also designed to use low amounts of power.
There are a couple of requirements for the input trigger and output pulse generated by the ranger. The input line should be held low (logic 0) and then brought high for a minimum of 10 microseconds. The pulse is generated on the falling edge of the input trigger. The ranger's receive circuitry is held in a short blanking interval of 100 microseconds to avoid noise from the initial ping and then it is enabled to listen for the echo. The echo line is low until the receive circuitry is enabled. Once the receive circuitry is enabled, the falling edge of the echo line signals either an echo detection or the timeout (if no object echo is detected).
- Voltage 5V
- Current 30mA typical, 50mA maximum
- Frequency: 40kHz
- Min Range: 3cm (1.18in)
- Max Range: 3m (9.84ft)
- Input Trigger 10µS minimum, TTL level pulse
- Echo Pulse: Positive TTL level signal, proportional to range
- Weight 11.33gm (0.4oz)
- Sensitivity: Detect a 3cm (1.18in) diameter stick at > 2m (6.56ft)
- Connection Type: Digital