Using LDR to get lux values

Other Hardware Sensors
1

Hello everyone :slight_smile:

I am doing a project and need a little help with one of the sensors. The initial idea is to have a LDR that measures the light intensity, which then moves a mechanism in accordance to the value of the light intensity measured. However, I can only get Voltage values from the LDR once it is connected to Arduino. Is there any way to transform this to luminosity values?

Thank you so much for your help. :))

2

You might be able to calibrate your LDR readings over a limited range by comparing them to the readings from a commercial, calibrated luxmeter. You will need to fit a nonlinear function.

Tutorial: Why Calibrate? | Calibrating Sensors | Adafruit Learning System

3

Check this project

4

An LDR is a great and inexpensive light/dark switch.

For any halfway reliable lux measurements use a lux sensor like the TSL2591.