SRF04 Original Ultrasonic Ranger

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
• Electricity: 30mA - 50mA max
• Frequency: 40 KHz
• Range: 3 cm - 3 m
• Sensitivity: Detect an object with a diameter of 3 cm at> 2 m
• Input trigger: 10?S min. TTL level pulse
• Echopulse: Positive TTL level signal whose width is proportional to the object area.
• Dimensions: 43 mm x 20 mm x 17 mm