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A project log for Android/RPi HDMI switch controller using RS232

This project shows how to connect a pretty cheap RS232 interface-based 4x2 HDMI switch to an Android phone via a Raspberry Pi

paul-whitakerPaul Whitaker 12/22/2016 at 17:140 Comments

Got the connections and code done in about 6 hours. Turning off Bluetooth and understanding the wiring of the monoprice were the biggest challenges, especially since it took a while to find the wiring document online.

I had a straight RS232 cable but the monoprice needs a sort-of crossover cable so I'm using jumpers. Could probably hack away at the cable I have.

The comms is really basic 9600 8N1, so it could probably be shrunk a lot with an Arduino or maybe there's something with RS232-to-TTL built in.

There are different versions of the android app, one I used a while ago allows a popup that returns status.I thought an indicator of the current status would be useful, but you can just tap the button for the one you want if you're not sure (i.e. if the screen is black).

Other ideas:

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