Fix readme

readme.md

@@ -32,7 +32,7 @@ This python script is supposed to run on a rpi and does the following :
 | OLED | GND, 3.3V, 2(SDA), 3(SCL) |
 | 5 BUTTONS | GND, 7, 8, 9, 11, 25 |
 | POTENTIOMETER | GND, 3.3V, 23 |
-| RELAY | GND, 5V, 17 |
+| ROTARY ENCODER | GND, 3V3, 27, 22 |
 
 You can check these here : [https://pinout.xyz/](https://pinout.xyz/)  
 
@@ -79,37 +79,16 @@ If you're short on GPIOs, there is a way to use a single GPIO for multiple butto
 
 #### Potentiometer circuit
 
-Using the 'step response' method described [here](http://razzpisampler.oreilly.com/ch08.html#Discussion) (It's the same principle as in the link above),
-we can use an analog potentiometer to control volume.
+Using [https://github.com/Tr3m/rpi-rotary-encoder](https://github.com/Tr3m/rpi-rotary-encoder), we can use a 3-pins rotary encoder to control volume.  
 
-The solution described in the previous link is not very accurate though, so we'll be using an alternative solution offered by abyz.me.uk :
+##### Wiring
 
-[https://abyz.me.uk/rpi/pigpio/examples.html#Python_pot_cap_py](https://abyz.me.uk/rpi/pigpio/examples.html#Python_pot_cap_py)
-
-##### Components
-
- * 100nf Ceramic capacitor
- * 5KΩ Potentiometer
-
-##### Diagram 
-
-```
-   3V3 ----- Potentiometer --+-- Capacitor ----- Ground
-                             |
-                             +-- GPIO 23
-```
-
-Instructions for use are in the source file. The library ('pot_cap.py') is included in this project for convenience.  
-
-You might have to install the 'pigpio' library though :
-
-```
-sudo apt install python3-pigpio
-```
-
-You can find out more about installing 'pigpio' here :
-
-[https://abyz.me.uk/rpi/pigpio/download.html](https://abyz.me.uk/rpi/pigpio/download.html)
+| ENCODER | RPI GPIO # |
+| ---    | ---   |
+| GND | GND |
+| + | 3V3 |
+| CLK | 27 |
+| DT | 22 |
 
 ## Optional steps