On a bicycle you’re typically looking ahead and slightly down to make sure you don’t ride over any potholes. While a speedometer is great on the handlebars, what if you could project your speed and other information onto the road ahead? Well, it turns out if you have a smartphone and a bit of ingenuity, you can do just that!
We’ve seen this hack done before with a pico projector, but that’s a pretty big investment for your bicycle. So [Peter] had another idea. What if you could just use your cellphone as is and a bit of optics? It turns out you can buy some pretty cheap “cell phone projectors” from China or Amazon — it’s basically a little cardboard box that your phone fits into, with a cheap plastic lens to project your image. Lumen output is pretty miserable, but if you’re riding at night, it is enough to see by!
Once he had the hardware down pat, he wrote an open source app available on GitHub in case you want to add your own features. If you just want to mess around with it, it’s available on Google Play.
The video is a bit hard to see, but you get the general idea of how it works below:
Filed under: Android Hacks, Cellphone Hacks
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