I connected my Raspberry to the pico-projector DLPDLCR2000EVM with no problem for an artistic project, following the instructions that I read in the Frederick Vanderbosch website (http://frederickvandenbosch.be/?p=2948), but I need to add an on/safe shutdown button.
After some problems trying to make my own circuit based on internet information, I decided to buy a Witty Pi 2 (http://www.uugear.com/product/wittypi2/). I installed the required software and opened the daemon.sh file that it installs to modify two pins configuration, because the DLP2000 projector need to use them. So, I changed the GPIO4 (Halt pin for Witty Pi) and the GPIO17 (LED pin for Witty Pi) to the GPIO27 and GPIO22 that are not going to be used by the projector. If I do a test with no projector connected everything works perfectly. It switches on and do a safe shutdown properly. When I connect the DLP 2000 to the WittyPi2 (which is connected to the Raspberry), but without configuring the config.txt file for the projector, it works perfectly. In this case, the projector shows only the splash screen (there is no data sent to it).
When I modify the /boot/config.txt file and the /etc/rc.local file and reboot the system for configure the Raspberry and let it use the projector, the problem appears: the system tries to switch on (you can see the red light in the Raspberry) and the projector shows the splash screen, but suddenly it switches off and you can't see any light in the Raspberry although the WittyPi2 white light is slowly blinking as it usually does when it is in "standby mode". It's like some signal switch off the system while it tries to switch on. You can press again the button for turn it on and the same thing happends.
I'm a newbie in this area and don't know what is happening. Don't know what is going wrong. I were trying to identify what part of the code were responsible of the failure, and I found that in the /boot/config.txt file, there were a line that, if remain commented with the #, let the system to switch on and off, but with no image in the projector. The line appears marked in bold text:
hdmi_timings=854 0 14 4 12 480 0 2 3 9 0 0 0 60 0 32000000 3
If I take the power connector and plug it directly to the Raspberry, it can switch on but the projector shows no image. If I connect via VNC server and do a gpio readall, I can see this:
Is there anyway to correct the configuration for using that on/off system? It is something indispensable for my project. Would be grateful if I have some help for fixing this system or for knowing an alternative if it's not possible.
Thanks in advance.