Ambient light detector, 5V, based on photodiode and opamp, no LDR (i.e. no Cadmium)
5V daylight intensity sensor for direct connection to the AD converter of the microcontroller. This little module requires only power (5V) and provides a voltage between 0V and 4.2V, depending on the intensity of the light falling onto the photodiode sensor. It can be connected directly to an analog-digital converter of a microprocessor for readout, requiring no further logic.
The four pins are positioned so the module can be inserted into a standard (2.54mm hole-to-hole) breadboard for experimentation.
Features
- 5V power
- 0-4.2V output; can be connected directly to an ADC of a microprocessor
- built around photodiode and opamp; no LDR involved, i.e., no cadmium
- ready for insertion in a standard (2.54mm hole-to-hole) breadboard
- board size only 14x15mm
- high-quality PCB, designed in KiCad and produced by Aisler (Germany), PCBWay (China), and OSH Park (USA)
- the board comes fully assembled and tested
NOTE: This module is 5V only and cannot be used with a 3.3V power supply.
Usage
I’ve created this module as a modern alternative to the traditional voltage divider circuits based on photoresistors (i.e., LDRs containing cadmium). Unfortunately, photodiodes (just like phototransistors) provide only a small current when light falls onto the silicon (they are tiny solar cells), so they need an operational amplifier (opamp) before the output can be delivered to an AD converter for readout.
This module provides the photodiode, the opamp, and its feedback circuitry in a single package ready for use.
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