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Raspberry Pi Wall Mounted Google Calendar
Blinking a LED with Onion Omega
Conclusion & Going Further
I cant see why it would not work with a 20 - 30" touchscreen, the main thing is to make sure it is compatible with your raspberry pi this may help http://raspberrypi.stackexchange.com/questions/9339/larger-touch-screen-displays the biggest thing i can say is to do the research first, I went the path of one labeled for raspberry use and the largest i found was 10.1
Raspberry Pi Class
Tools and Materials for Arduino
Welcome to Arduino
How to DIY a Gatling Gun-Style Voice-Controlled Wi-Fi Speaker
Build Your Own Motor Driver
Controlling Multiple LEDs with an Arduino Uno.
Ammo Can BlueTooth Boom Box
Mega Power Bank
made it for my wife, i added a touch screen, speakers for audio alarm (because she was missing appointments, not checking a normal calendar) and a keypad if she prefered to use that for typing, i used a 10" touch screen because of space
Simple Solar Circuits
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