Adaptive brightness control for seven segment LED displays

Posted on Friday, July 6th, 2012 in demonstrations, DIY by DP

Raj made a temperature and relative humidity meter to demonstrate adaptive brightness control on a seven segment LCD. The system uses a LDR light sensor in a closed loop to continuously adjust the brightness of the LEDs.

The objective of this project is to illustrate a technique of implementing adaptive brightness control to seven segment LED displays. It consists of a closed loop system that continuously assesses ambient light condition using an inexpensive light-dependent resistor (LDR) and uses that information to adjust the brightness of the display. For the proof of concept, the technique is applied to construct a digital temperature and relative humidity meter that adapts the brightness of the seven segment LED displays to the surrounding lighting conditions.

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