Pololu Distance Sensor with Pulse Width Output, 130cm Max

Product Code:
4071
£12.66 £10.55

This small lidar-based distance sensor reports the distance of objects up to about 130 cm (50″) away with a pulsed signal similar to a hobby servo control signal. A digital microcontroller pin can be used to time the length of each high pulse, which encodes the measured distance. The sensor works over an input voltage range of 3.0 V to 5.5 V, and the 0.1″ pin spacing makes it easy to use with standard solderless breadboards and 0.1″ perfboards.

Note: The maximum range of 130 cm is only achievable for high-reflectance objects in good ambient conditions. Lower-reflectivity targets or poor ambient conditions will reduce the maximum range.

Pololu Distance Sensor with Pulse Width Output, 130cm Max Pololu Distance Sensor with Pulse Width Output, 130cm Max
Pololu Distance Sensor with Pulse Width Output, 130cm Max

This compact sensor makes it possible to measure the distance of objects up to about 130 cm (50″) away using a simple digital pulse width interface (similar to a hobby servo control signal). It uses a short-range lidar module to precisely measure how long it takes for emitted pulses of infrared, eye-safe laser light to reach the nearest object and be reflected back, allowing for 1 mm resolution. As long as the sensor is enabled, it takes continuous distance measurements and encodes the ranges as the widths of high pulses, which can then be timed by a microcontroller using a single digital input.

 

A camera with no IR filter shows the infrared light emitted by a Pololu Digital Distance Sensor.

 

The relationship between measured distance d (in mm) and pulse width t (in µs) is as follows:

     d=2 mm1 µs(t 1000 µs)d=2 mm1 µs⋅(t –1000 µs)

     t=1000 µs+1 µs2 mmdt=1000 µs+1 µs2 mm⋅d

The timing uncertainty is approximately ±5%. As objects approach the sensor, the output pulse width will approach 1.0 ms, while an object detected at 130 cm will produce a 1.65 ms pulse width. The sensor uses a pulse width of 2.0 ms to indicate no detection. The pulse period T ranges from around 9 ms to 10 ms, depending on the proximity of the detected object.

The maximum detection range depends on object reflectivity and ambient lighting conditions. In our tests, the sensor was able to reliably detect a white sheet of paper out to its maximum range of 130 cm, and it could reliably detect a hand out to around 80 cm away. The following graph shows the measured distances of three units versus their actual distances from a variety of targets at several different ranges:

 

 

Please note that while this sensor can detect objects to within about 1 mm of the sensor face, the effective minimum distance it can measure is around 4 cm, so objects closer than 4 cm might result in an inaccurate measurement.

Specifications

  • Operating voltage: 3.0 V to 5.5 V 
  • Current consumption: 30 mA (typical) when enabled, 0.4 mA when disabled
  • Maximum range: approximately 130 cm (50″) (for high-reflectivity targets in good ambient conditions; lower-reflectivity targets or poor ambient conditions will reduce the maximum detection range)
  • Minimum range: 4 cm (for accurate measurement); < 1 mm (for detection)
  • Update rate: 100 Hz to 110 Hz (10 ms to 9 ms period)
  • Field of view (FOV): 15° typical; can vary with object reflectance and ambient conditions
  • Output type: digital pulse width
  • Dimensions: 0.85″ × 0.35″ × 0.136″ (21.6 × 8.9 × 3.5 mm)
  • Weight: 0.014 oz (0.4 g)

Jumper settings (irs17a)

The board features four surface-mount configuration jumpers that determine its operation mode. Different versions of the Pololu Digital Distance Sensors ship with the appropriate jumpers pre-populated with 0 Ω resistors. These resistors can be desoldered from the populated spots or solder bridges can be added across the unpopulated spots to convert one sensor version into another. This sensor can be converted into any other irs17a version as listed in the following table

Item # Description Maximum
range*
Hysteresis Resolution Minimum
update
rate
Jumper
settings
(4321)
#4066 Digital output, 25cm 25 cm 50 mm - 100 Hz 0000
#4067 Digital output, 50cm 50 cm 50 mm - 100 Hz 0001
  Digital output, 75cm 75 cm 50 mm - 100 Hz 0010
#4069 Digital output, 100cm 100 cm 50 mm - 100 Hz 0011
  Digital output, any detect ~130 cm - - 100 Hz 0010
#4071 Pulse width output, 130cm max ~130 cm - 1 mm
(= 0.5 µs)
100 Hz
(110 Hz max)
0101
  Digital output,125cm 125 cm 50 mm - 30 Hz 1000
  Digital output,150cm 150 cm 50 mm - 30 Hz 1001
  Digital output,175cm 175 cm 50 mm - 30 Hz 1010
#4077 Digital output, 200cm 200 cm 50 mm - 30 Hz 1011
  Digital output, any detect ~300 cm - - 30 Hz 1100
#4079 Pulse width output, 300cm max ~300 cm - 2 mm
(= 0.5 µs)
30 Hz
(33 Hz max)
1101

* Effective range depends on object reflectivity and ambient lighting conditions.

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