The microcontroller-based concept was chosen because I wanted to scale the sensor system later to suit other applications. Here is the diagram of my Arduino infrared close ... receiver IR1 is only ...

[Richard’s] DIY air quality meter ... direct light, but only light reflected by the passing by dust particles, to reach the photodiode. An accurately trimmed amplifier within the sensor package ...

The Apollo Arduino training board comprises of a number of components including three high quality single turn potentiometers, buttons, piezo speaker, light sensor, microSD card, pressure gauge ...

The camera originally came with an analog light meter built-in ... that incandescent lights flicker at a rate of 50/60 Hz. His sensor was picking this up and the sinusoidal output was causing ...