Rev 2.x series of the Pi Zero W adapter board for the DLP2000EVM mini projector.
Currently taking expressions of interest. Add your name to the waitlist!
Rev 2.0 of the PiProjector is here!
LiPo battery management giving you 1 hour of video per Ah of battery. That is: A 2.5Ah LiP…
Currently taking expressions of interest. Add your name to the waitlist!
Rev 2.0 of the PiProjector is here!
LiPo battery management giving you 1 hour of video per Ah of battery. That is: A 2.5Ah LiPo can play video continuously for 2 hours 30 minutes.
What is it?
The DLP2000 is a relatively cheap DMD, (Digital Mirror Device). It supports a resolution of 854 x 480. Not huge, but TI are selling their "evaluation boards", (the DLP2000EVM), for around US$99 which is pretty cheap for a projector. However, these eval boards are only designed for the BeagleBone.
So this is a simple adapter board that allows you to use an ordinary Pi Zero W instead of a BeagleBone.
Why did I make it?
The DLP2000 was too cool to pass up and I wanted it to work on a Raspberry Pi Zero W, because... well... because...
Also, I wanted to make the smallest cheapest pocket projector around.
The adapter board makes a much cleaner, more permanent install for a Pi Zero W rather than a rats nest of wires. (If you saw my video on this, you would understand.)
What makes it special?
This PCB is a step up from the Rev 1.x series. With the ability to power from a DC jack or LiPo battery and also charge the LiPo.
I also added an MCP23008SO SMD, which is an 8 port GPIO I2C expander. This gives you 4 GPIOs to be used for whatever you want, but also provides access to monitor the LiPo charging circuitry. So you can check on the state of the battery, whether plugged in to DC, running off battery, low battery, charging or fully charged. There's also a handy power switch so you can switch the unit off whilst still charging the LiPo.
I've managed to play a video on loop for 2 hours 45 minutes from a 2.5Ah LiPo battery. So, in theory you should be able to get 5 hours from a 5Ah battery.
A nice big ground plane gives a rock solid display, but I've left a void so that it doesn't interfere with the Pi Zero W WiFi signal.
You can also mount the Pi Zero W above or below the PCB and mount the PCB above or below the projector, depending on how small you want the unit to be.
In later versions I'll be adding:
Servo control of focus.
Line out audio! If you want to use audio currently, you'll need to make use of Bluetooth audio.
What do you get?
The current Rev 2.x batch of boards I'll be selling as a fully populated and tested board. Soldering of the very fine pitched LiPo management and DC boost converter would be a little tricky for most people, so I'm not including a kit option. However, I've added in an option to order without headers, or with headers you have to solder yourself.
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