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The new versions have the same dimensions and pinout as the originals and are intended as drop-in replacements for any applications that can tolerate the change in component locations. This sensor can be triggered by ambient IR e. When applying shielding, keep in mind that reflection off the shielding itself can cause undesired activation datashete the sensor. Unlike most IR receiver modules designed for remote control of appliances like televisions, the TSSP has a fixed gain sensitivity that makes the sensor more predictable when used in proximity or reflectance sensors.

Print Email a friend Feeds. Feedback Comments or questions? Schematic diagram This schematic is also available as a downloadable pdf k pdf.

Pololu 38 kHz IR Proximity Sensor, Fixed Gain, Low Brightness (irs05a)

If you have the appropriate equipment, you can tune it by setting the actual frequency, but a simpler approach is to just observe the performance as you turn the pot. This schematic is also available as a downloadable pdf k pdf. Alternatives available with variations in these parameter s: Multi-module applications might require use of the enable inputs to limit interference.


Some optical shielding, such as by having the sensor mounted receiver-side-down when fluorescent lights are above, might mitigate this. The main changes are the locations of the emitter LED and Datasheet detector, which have been moved away from the edge of the board. An enable input allows control of whether or not the IR LED is on, and a digital output indicates whether or not an object is detected.

The sensor is merely looking at whether or not it is getting any signal back, so object size and reflectivity to IR will affect sensing range. The actual performance depends on many factors, including object size, reflectivity, and ambient lighting conditions.

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Datwsheet Sensors and Range Finders. For many applications, additional shielding can be used to block undesirable sensing paths, such as reflections off of the ground, or to reduce interference from ambient lighting. Products New Products Specials! The proximity sensor has four connections: To run the sensor at full brightness while powered at 3. This pin is high by default and can be left disconnected if dynamic control of the IR emitter is not needed.

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Tuning the emitter frequency The trimmer potentiometer on the receiver side of the sensor can be used to adjust frequency of the IR emitter LED. Multiple sensors can interfere with each other. This results in better shielding from the PCB itself, which improves performance. When at the edge of the detection range, this output will alternate between high and low.


Several alternatives are available for this product. The trimmer potentiometer on the receiver side of the sensor can be used to adjust frequency of the IR emitter LED. Using the sensor Connections The proximity sensor has four connections: Select variant Several alternatives are available for this product.

The sensing angle is relatively wide in both directions. Shop Blog Forum Support. Limitations This sensor will only tell you if an object is within its sensing range, not how far away it is. Some advanced analysis of the correlation between the output and toggling of the enable input might also be used to mitigate ambient interference.

The sensor should work to at least some degree over the entire range of the pot. The logic power, VDD, should be between 3. A red LED on the emitter side of the board is tied to this output and turns on when the pin goes low, providing a visual indication of when the sensor is detecting something. At the edge of its detection range, the output will alternate between high and low as it sporadically detects see the left oscilloscope capture below.

You can use several of the proximity sensors with these discrete IR receivers to make sophisticated sensing solutions in which you enable one emitter at a time and monitor the reflections with the other sensors.

The four connections are arranged with a 0.