doc update readme

README.md

@@ -9,7 +9,7 @@ Python code and assets Selfiebooth Baas van Horst aan de Maas.
 
 Connect raspberry PI camera module to board
 
-![Camera connection](doc/camera_connection.png)
+![Camera connection](doc/camera_connection.jpg)
 
 ### 2. GPIO setup for button
 
@@ -19,13 +19,12 @@ we have a pull-up resistor, the digital value will be 1 when the swich (push but
 is pressed, we would like the value to go from 1 to 0 and raise a falling event. Therefore, the other wire needs to be 
 attached to the ground (index 9). We use a pull-up vs a pull-down since it is less sensitive for interference.  
 
-Index 3 (BCM pin 3) and index 9 (ground) are illustrated in this figure:
+Index 3 (BCM pin 3) and index 9 (ground) connection illustration:
 
-![GPIO set-up](doc/gpio_setup.png)
+Pin layout                          |  Connection
+:----------------------------------:|:-------------------------:
+![GPIO set-up](doc/gpio_setup.jpg)  |  ![GPIO connection](doc/gpio_connection.jpg)
 
-Here you see a photo of the connection:
-
-![GPIO connection](doc/gpio_connection.png)
 
 ## Software setup
 
@@ -47,16 +46,16 @@ The app searches for a USB stick that is inserted to the pi. If a config folder
 directory existed; a backup will be created. 
 
 ### Config file parameters
-- bottom_image: image path
-- top_image: image path
-- flash_image: image path
-- countdown_images: list of image paths, every image takes 1 second
-- screensaver_images: list of image paths
-- flash_time: time in secs
-- freeze_time: time in secs
-- screensaver_time: time in secs
-- screensaver_slide_time: time in secs
-- screen_width: pixel size
-- screen_height: pixel size
+- `bottom_image`: image path
+- `top_image`: image path
+- `flash_image`: image path
+- `countdown_images`: list of image paths, every image takes 1 second
+- `screensaver_images`: list of image paths
+- `flash_time`: time in secs
+- `freeze_time`: time in secs
+- `screensaver_time`: time in secs
+- `screensaver_slide_time`: time in secs
+- `screen_width`: pixel size
+- `screen_height`: pixel size
 
 All specified paths are relative to the config file