They come with Windows drivers and software to download messages to the device, the intention being that you download your message then unplug and run the display from its internal battery. These displays typically have a USB socket for charging and programming, and appear to a PC or Pi as a virtual serial port. I opted for an “LED badge” which is a small scrolling message board, purchased on ebay for £13 (about $20). ![]() To build this I needed a WiFi-connected computer (a Raspberry Pi is an obvious choice) plus a display that is easily visible in a variety of lighting conditions. For a while I’ve wanted to build a “Flight Readiness” unit that I can have near me when filling a balloon, and will show me if the tracker is running OK or if there’s a problem with the tracker or receiver (e.g.
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