A Pocket Projector for the Raspberry Pi
The ever-growing list of projects based on the Raspberry Pi just added one more entry. Although technically compatible with all models of the mini computer, its creator MickMake recommends using the Raspberry Pi Zero for size reasons. What did he do? A pocket projector that combines a custom PCB with a digital micromirror device sold by Texas Instruments as an evaluation module.
Connecting a conventional projector to a Raspberry Pi isn't too complicated. In fact, it's the same as connecting an HDMI monitor, but there's also the possibility of placing the mini computer inside the projector, especially if we use the Zero models. However, what we have here today is different. The projection system you'll see below is almost as compact as the Raspberry Pi Zero itself, so with the help of a battery, the mini computer could be turned into a truly portable projector. If you want to know more, watch this video:
Hardware and Cost
This project by MickMake on YouTube uses the DLP2000 module, a digital micromirror device (or DMD) sold by Texas Instruments. Each evaluation module costs 99 dollars, a fairly reasonable number, but it has a small problem: its pinout is physically compatible with the BeagleBone. Anyone can use cables to connect each pin between the DLP2000 and the Raspberry Pi, but MickMake decided to build an open-source PCB that acts as an adapter. The latest version of the PCB includes support for LiPo battery charging and replaces the weak microUSB port with a classic barrel input.
The projector's resolution is 854 x 480 with a maximum of 30 lumens, and it is recommended for use in a very dark room. As for power consumption, the projector never exceeded 700 mA, although the Raspberry Pi Zero helps a lot in this regard. If you want to buy the PCB, you can click here. Texas Instruments sells the DLP2000 on its official page, and if you prefer to see the PCB design, you'll find everything you need on GitHub.
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