Time of flight optical range finder

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What is LDR-M10?

LDR-M10 is the first affordable, short range Lidar with time of flight measuring capability. It is designed for fast short range detection of objects. It is perfect for use with robotics and other applications where a low power fast response sensor is needed at short ranges.

LDR-M10 is a true time of flight sensor. It sends out 1 million pulses per second and measures the time for the pulse to return. It has been in development for over 10 years and has been tested with UAV and ground robots.

Since the sensor has a +/- 20 Degree FOV, it outputs a voltage proportional to the range to the nearest object in the FOV. This allows object avoidance for small robots without any signal processing. The minimum interface uses a 3 pin servo connector. This connector supplies ground, power and detected range output. The range signal is a 5 Volt analog signal that can be connected straight to an analog input channel of Arduino or other controller. If a 2.5V signal range is desired, then it is only necessary to place a 1K 1% resistor from range pin to ground.


  • +/- 0.1 inch resolution
  • +/- 20 Degree Field of View
  • 10” to 4 feet range (depending on object reflectivity)
  • Will detect a white wall at 5 feet away
  • Returned Energy LED Indicator
  • Analog output 0-5V
  • 50 Hz Analog Bandwidth
  • Power supply voltage from 11 to 14 Volts
  • Less than 900 mW power consumption @11V
  • TTL level Shut Down pin to conserve power (100uA)
  • Operating Temperature range of 0-50 C
  • Weight 65 grams
  • Dimensions 2” x 3.2” x 1” without mounting flange. 2” x 4” x 1” with mounting flange.
  • Can work outdoors in indirect sunlight
  • Made in USA


LDR-M10 is warranted for 90 days from the date of purchase. During the first 30 days the device can be returned for a full refund (excluding shipping).


Can you use multiple units next to each other without the modules interfering with each other?

Yes, multiple units can share the same field of view.

What will happen if I use the device beyond its intended temperature range?

The device may continue to work, however it is not guaranteed to do so.

Can I use an external step up power supply to boost voltage from 3.3V - 5V power?

Yes however you must make sure that the supply does not create excessive high frequency ripple or noise. We have used DFRobots DFR0123 DC-DC converter with success.

How do I make the sensor run at the lowest power that it can.

Minimum power is consumed with input voltage of 11 Volts. The TTL level Shut Down pin can further reduce power to less than 100uA.

What is the minimum resolution of the Range output?

Since the outputs from the LDR-M10 are analog voltages, the minimum resolution is determined by the LSB of the analog to digital converter used to interface the device to the system.