The SRF04 was designed to be just as easy to use as the Polaroid sonar, requiring a short trigger pulse and providing an echo pulse. Your controller only has to time the length of this pulse to find the range. The connections to the SRF04 are shown below:
Specifications:
- Voltage: 5V
- Current: 30mA - 50mA Max
- Frequency: 40KHz
- Range: 3cm - 3m
- Sensitivity: Detect 3cm diameter broom handle at >2m
- Input Trigger: 10µS Min. TTL level pulse
- Echo Pulse: Positive TTL level signal, with the width proportional to the object range.
- Size: 43mm x 20mm x 17mm
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