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Schematic diagram This schematic is also available as a downloadable pdf k pdf. The sensing angle is relatively wide in both directions.

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The four connections are arranged with a 0. Multiple sensors can interfere with each other. Tuning the emitter frequency The trimmer potentiometer on the receiver side dataheet the sensor can be used to adjust frequency of the IR emitter LED. When at the edge of the detection range, this output will alternate between high and low.

Proximity Sensors and Range Finders.

1PCS ICM7555IBAZ ICM7555 ICM7555ID 7555ID 7555CD ICM7555CD SOP8

This pin is high by default and can be left disconnected if dynamic control of the IR emitter is not needed. 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.

Limitations This sensor will only tell you if an object is within its sensing range, not how far away it datasjeet. 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. Multi-module applications might require use of the enable inputs to limit interference. The trimmer potentiometer on the receiver side of the sensor can be used to adjust frequency of the IR emitter LED.


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.

This sensor can be triggered by ambient IR e. Using the sensor Connections The proximity sensor has four connections: Print Email a friend Feeds. The logic power, VDD, should be between 3. 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. 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.

Select variant Several alternatives are available for this product. Alternatives available with variations in these parameter s: Some optical shielding, such as by having the sensor mounted receiver-side-down when fluorescent lights are above, might mitigate this.

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The main changes are the locations of the emitter LED and IR detector, which have been moved away from the edge of the board. The sensor should work to at least some degree over the entire range of the pot. 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. 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.


To run the sensor at full brightness while powered at 3. This datashee in better shielding from the PCB itself, which improves performance. Shop Blog Forum Support. When applying shielding, keep in mind that reflection off the shielding itself can cause undesired activation of the sensor.

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.

The actual performance depends on many factors, including object size, reflectivity, and ambient datashet conditions.

Feedback Comments or questions? At the edge 7555c its detection range, the output will alternate between high and low as it sporadically detects see the left oscilloscope capture below.

electronics 7555CD ICM7555CD SOP-8 real-time clock chip

Some advanced analysis of the correlation between the output and toggling of the enable input might also be dataxheet to mitigate ambient interference. The proximity sensor has four connections: Products New Products Specials! Several alternatives are available for this product.

This schematic is also available as a downloadable pdf k pdf.