Rotary Encoder Interfacing With MSP430 LaunchPad
Incremental Rotary Encoder
first of all i would like to tell you , these type of rotary encoder is totally digital component so you can’t directly replace these with you conventional pots. so lets start what are Incremental Rotary Encoder , Incremental rotary encoders by the looks of it just like a general purpose pot looks like but output is quite different they provide a pair of digital signals that allow a microcontroller to determine the direction of a shaft’s rotation. They can be used to monitor motors and mechanisms, or to provide a control-knob user interface.
for a quick look here is a typical incremental rotary encoder
and hear the output wave form
Decoding with Microcontroller
in this examples we will be decoding the rotary encoder with the help of sate machine.
view of state machine in the wave form
Schematic with MSP430G2211
Source code and firmware
CLIK Here To download Source Code and Firmware.