7555CD DATASHEET PDF

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Multi-module applications might require use of the enable inputs to limit interference.

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The four connections are arranged with a 0. 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. Alternatives available with variations in these parameter s: The proximity sensor has four connections: Limitations This sensor will only tell you 7555ccd an object is within its sensing range, not how far away it is.

Some advanced adtasheet of the correlation between adtasheet output and toggling of the enable input might also be used to mitigate ambient interference. 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.

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.

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Multiple sensors can interfere with each other. 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.

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. Using the sensor Connections The proximity sensor has four connections: This schematic is also available as a downloadable pdf k pdf. The sensor should work to at least some degree over the entire range of the pot.

This pin is high by default and can be left disconnected if dynamic control of the Datasheeh emitter is not needed. Feedback Comments or questions? The main changes are the locations of the emitter LED and IR detector, which have been moved away datashdet the edge of the board.

The actual performance depends on many factors, including object size, reflectivity, and ambient lighting conditions. 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 sensor can be triggered by ambient IR e. Schematic diagram This schematic is also available as a downloadable pdf k pdf. Several alternatives are available for this product.

Products New Products Specials! To run the sensor at full brightness while powered at 3.

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The trimmer potentiometer on the receiver side of the sensor can be used to adjust frequency of the IR emitter LED. Shop Blog Forum Support. Print Email a friend Feeds.

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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. When applying shielding, keep in mind that reflection off the shielding itself can cause undesired activation of the sensor.

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. This results in better shielding from the PCB itself, which improves performance. Proximity Sensors and Range Finders.

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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 sensing angle is relatively wide in both directions. 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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When at the edge of the detection range, this output will alternate between high and low.