Build your own Wifi radio

Step 7 Using a rotary encoder

All input in this project is done by a rotary encoder. It is basically the same as your mousewheel including the push-function. However, where your mousewheel is most likely an optical encoder, I used a mechanical encoder for my project.

A rotary encoder on A and B channel (both a pin) with one common pin that can be either connected to GND or Vcc. As we use it with interrupts, we'll connect it to GND. The A and B channel open and close in a fixed patern and by reading this pattern, we know in what way the encoder is turning. By adding one channel to and interrupt, we are able to trigger the read subroutine automatically when the encoder is turned.

In bascom, that will give us:

A Alias Pind.3
B Alias Pind.4

Config A = Input
Config B = Input

Config Int0 = Falling

Dim Counter As Integer

Set B

On Int0 Getencoder

Counter = 0

Enable Interrupts
Enable Int0

Do

Your code here

Loop

Getencoder:
Waitms 1
If A = 0 Then
If B = 0 Then Incr Counter Else Decr Counter
End If
Return

End


The pushbutton on the rotary encoder works just like a normal button, so nothing much to explain there.