Sensor array

Enables reading mutiple resistive sensors (ex. photoresistors) to be measured on a single analog input pin (ex. on an Arduino) using a digital multiplexer (right switch 2:1) and an analog multiplexer (lower switch array = 4:1). Diodes are used to prevent parasitic current flow through the unused sensor in the same column which gets "some" voltage through the other six sensors. If this is not an issue for (resistance of the sensors changes only slightly with input), you may scratch them. However: If the sensor in the same row as well as the sensors of another row are siginificantly less resistive than the one actively measured, the voltage will change massively.

published 7 years ago