Product description: Digital distance sensor 25 cm - Pololu 4066
Small module withdistance sensorbased onLidartechnology. Digital sensor with operating rangeup to 25cm, poweredfrom 3V to 5.5V. It is equipped with one digital output that changes its state to low when an object is detected. The sensoris not able to measure distance, it only informs when it encounters an obstacle within 25 cm with an accuracy of1 mm. This sensor uses a short range Lidar module toaccurately measurethe time it takes for the emitted pulses of eye-safe infrared light to reach the nearest object and be reflected back.
Application example
- Alternative brake light sensor and photobeam
- Non-contact sensor for robot collision or obstacle
- A non-contact interface element to activate a device or process
- Counter or timer for objects as they pass by
Infrared light emitted by the sensor, captured with a camera without IR filter.
Digital distance sensor 25 cm.Using the distance sensor
The module is equipped with 3 leads:VIN, GND and OUT.Pins are located on the board in the form of holes with a 2.54 mm raster, to which you can soldergoldpin connectors(not included). On VIN pin a voltage from3 V to 5.5 Vshould be applied, GND to ground (0 V). The OUT pin triggers low (0 V) when an object is detected and high (to VIN) when an object is not detected. TheredLEDalso lights up when an object is detected. The board also has an ENABLE pin that can be set low to put it into a low power state, which consumes about 0.4 mA of current. The ENABLE pin is pulled up to VIN by default.
There is a protective film on the sensor that must be removed before working with the module.
Jumper settings on the sensor module
There are four surface mount configuration jumpers on the board that determine its operating modes. Different versions of Pololu sensors have jumpers set appropriately in the form of 0 Ω resistors. The resistors can be soldered or bridges can be added to convert one version of the sensor to another. This sensor can be converted to any other version of irs17a according to the table below.
Pin and jumper layout of the distance sensor module.
| Product | Description | Range max. | Hysteresis | Distribution | Minimum update frequency | Jumper settings (4321) |
|---|---|---|---|---|---|---|
| #4066 | Digital output, 25 cm | 25 cm | 50 mm | - | 100 Hz | 0000 |
| #4067 | Digital output, 50 cm | 50 cm | 50 mm | - | 100 Hz | 0001 |
| Digital output, 75 cm | 75 cm | 50 mm | - | 100 Hz | 0010 | |
| #4069 | Digital output, 100 cm | 100 cm | 50 mm | - | 100 Hz | 0011 |
| Digital output, any detection | ~130 cm | - | - | 100 Hz | 0010 | |
| #4071 | PWM output, max. 130 cm | ~130 cm | - | 1 mm (- 0.5 µs) | 100 Hz (max. 110 Hz) | 0101 |
| Digital output, 125 cm | 125 cm | 50 mm | - | 30 Hz | 1000 | |
| Digital output, 150 cm | 150 cm | 50 mm | - | 30 Hz | 1001 | |
| Digital output, 175 cm | 175 cm | 50 mm | - | 30 Hz | 1010 | |
| #4077 | Digital output, 200 cm | 200 cm | 50 mm | - | 30 Hz | 1011 |
| Digital output, any detection | ~300 cm | - | - | 30 Hz | 1100 | |
| #4079 | PWM output, max. 300 cm | ~300 cm | - | 2 mm (= 0.5 µs) | 30 Hz (max. 33 Hz) | 1101 |
Comparison of Pololu and Sharp sensors.Comparison with Sharp sensor
Pololu sensors have the sameshape and leadsasSharp sensors. They are available in the same sensing ranges and in longer ranges. This means that they can be usedinterchangeably. The sensors in the newer Pololu devices aremuch thinnerthan the Sharp modules, so the zero point is about 7mm closer to the plate, and the beam angle is wider in the newer devices.
Pololu distance sensor specifications
- Supply voltage: 3 V to 5.5 V
- Current consumption: 30 mA (typical) when switched on, 0.4 mA when switched off
- Maximum range: 25 cm
- Minimum range: up to 1 mm
- Minimum update rate: 100 Hz (10 ms period)
- Field of View (FOV): typically 15°, may vary depending on object reflection and environmental conditions
- Output Type: digital signal (low when object detected, high otherwise)
- Dimensions: 21.6 x 8.9 x 3.5 mm
- Weight: 0.4 g
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Output signal diagram.
Output signal diagram.
