Wedge Raspberry Pi TouchScreen Holder

thingiverse

I use Volumio for my music playback and had been looking for a way to use the touchscreen interface for when my computer is switched off. For a while I looked for some solution that was reasonably elegant and found it in amason101070's screen mount. I took the screen mount itself and designed a wedge that it can slot into. I have issue with my network and sometimes it drops and the Pi doesn't get back on. Before the screen I used a button and a Python script so I could safely reboot the machine. Now I don't need it as it can be down with the touchscreen. However something I did want is the ability to control the backlight levels. So I retasked the script and button so it now a short press cycles through 3 levels of backlight and a 2 second hold turns the backlight off. I used a button with ring LED and the LED is connected to a GPIO pin 13 and allows for PWM so the LED 'breaths' when the screen is turned off. Also when turning the screen off, the music will be paused (if playing) and resumed when the screen it turned on (if it was playing when turned off). I have adjusted the screen holder from the original as the button goes through it so there is a cut-out to allow for that. There are several wedges available, with or without the button and with or without the Volumio logo. There is also a button plug included if you want to use a button later and don't want to reprint the whole thing again. The LED button was from eBay (https://www.ebay.co.uk/itm/381858325502?ul_noapp=true). It is 12mm diameter and has no resistor on the LED - many are "12V" i.e. have an internal resistor. Though given the resistor value I have used it would probably illuminate okay. I just wanted full control over how bright it was. Mounting the button is a little tricky. The nut gets slotted up into the groove in the opening on the underside. You then have to rotate the button to screw it down. I would advise caution doing when tightening. I use some thin nosed pliers on the front, but they scratched the finish. Probably better to go from the inside if possible. **-UPDATE 30/12/2018-** Find a guide I wrote on how I got the whole thing setup on the software side here: https://volumio.org/forum/guide-for-setting-touchscreen-backlight-control-t11425.html Updated text as the LED can now connect to a GPIO pin for PWM control and the script allows for pausing and resuming of playback when the screen is blanked.