Line 19 - We then compare the current state of the CLK pin againts its previous state. Line 17-18 - So first, we get the current state of our CLK and DT pins Line 16 - 26 - This is an infinte loop in which we check the states of our CLK and DT pins to first see if the encoder is being rotated, and then to work our if its being rotated clockwise or anti-clockwise Line 12 - Get the inital state of our CLK pin Line 11 - Define our counter variable, starting at 0 Line 8-9 - Set our GPIO pins to inputs, with a pull down resistor. Line 5 - Define the GPIO pin for our DT pin of our rotary encoder Line 4 - Define the GPIO pin for our CLK pin of our rotary encoder Lets dive into the code and see how it works. As you rotate the encoder clockwise, the number increase by 1 each "click" and as you rotate it anti-clockwise it decrease by 1 each "click".
SERVO MOTOR ARDUINO CODE KNOB DOWNLOAD
Or download it directly to your Pi using this command in a terminal window: You can download our example code from our github. You don't need to worry about any resistors or other compontents, as the encoder has built in 10k Ohm resistors keeping the current to an absolute minimum! That's it as far as wiring up is concerned.
This is what rotating the encode anti-clockwise 1 click looks like:Īs you can see from the diagram, you need to wire up the rotary encoder as follows: This is what the internals of a rotary encoder look like: With a simple bit of logic, you can work out the direction of the rotation (explained in detail below, be sure to check the code first!). If the internal contacts were originally HIGH (or making the circuit) after a single click, they would now both be LOW (breaking the circuit). As you turn the knob you can feel it "click" indicating that one position has been rotated. It works by having 2 internal contacts that make and break a circuit as the knob is turned.
Lets start with a brief explanation of what a rotary encoder is, and how they work!Ī rotary encoder is a device that senses the rotation and direction of the attached knob.
SERVO MOTOR ARDUINO CODE KNOB HOW TO
In this simple tutorial we will be showing you how to wire up your rotary encoder and how to use some python code to interact with it.
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