This Circuit can compare the Light level in an area. It uses a PN Photodiode as the light sensor and IC CA3140 as voltage comparator. The circuit is ideal as the front end of burglar alarm circuits.

The TSL2561 sensor combines one broadband photodiode (visible plus infrared) and one infraredresponding photodiode on a single CMOS integrated circuit capable of providing a near-photopic response ...

When used with green LEDs, such as Vishay’s VLMTG1400, the photodiode’s small size and high sensitivity enable slim sensor designs for optical heart rate detection in wearable devices such as ...

This pulse oximeter is so simple and cheap to build it’s almost criminal. The most obvious way to monitor the output of the sensor is to use an oscilloscope. The poor-man’s stand-in for… ...

On our travels round the hardware world we’ve encountered more than one group pursuing the goal of making their own silicon integrated circuits, and indeed we’ve seen [Sam Zeloof] producing ...

The sensor demonstrated successful 1390 nm imaging results, offering an environmentally-friendly alternative to first-generation quantum dots that contain lead, which limited their widespread ...

Vishay Intertechnology High Speed PIN Photodiode Delivers Precise Signal Detection, Enables Slim Sensor Designs for WearablesDevice Offers Enhanced Sensitivity for Visible Light in 5 mm by 4 mm ...

ActLight: Ultra Small, Very Low Power Consumption Heart Rate Monitoring Sensor for Hearables? You Need the ActLight Dynamic Photodiode PUBLISHED ONNovember 25, 201912:19 AM ...

The sensor successfully demonstrated 1390 nm imaging results, offering an environmentally friendly alternative to first-generation quantum dots that contain lead, which limited their widespread ...