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USR40X - Digital Ultrasonic Ranger
USR40X -- Digital Ultrasonic Ranger

USR40X - Digital Ultrasonic Ranger - is high performance multidetecting* digital sensor, which can be used with OOPic, Basic Stamp, BS2p as well as wide variety of mirocontrollers that have I2C bus for data communication. For I2C users - this sensor appears the same way as 24xx series EEPROM with a different I2C address. This address can also be changed.
If your microcontroller does not have I2C interface, this sensor can also be used in analog mode.

Download user manual here.
Technical Specifications
  • Voltage: 5V
  • Current: 15 mA Typical, 3 mA Standby
  • Frequency: 40 KHz
  • Maximum Range: 9 meters (~30 ft.)
  • Minimum Range: 15 cm (~6")
  • Max Analog Gain: Automatic tuned in 128 steps
  • Connection: Standard I2C Bus
  • Timing: Fully timed echo, freeing host controller of task
  • Readings: Reads upto 16 echos - (keeps looking after first echo)
  • Units: Range reported in uS, mm, or inches
  • Size: 1.75 x 0.85 x 0.7 in (45 x 22 x 18 mm)
Comparision between USR40X and SRF08

I2C bus with analog output I2C bus only
Interrupt signal on conversion No interrupt signal
TRIG input for begining conversion No TRIG input
128 gain setting 32 gain setting
maximum range: 9 meters maximum range: 6 meters
No LDR for ambient light value LDR for reading ambient light value