Tag Archive: touchscreen


Well, I was super-excited to be part of the ThinkHaus great global hackerspace challenge, and right as it was kicking off my father ended up in ICU @ the hospital. I have been spending most of my free time there with my family, but have found a few hrs. to work on the GGHSC. Our project is basically a homebrew PLC that any dummy can program. Think snap-circuits meets legos. Pre-build modules can be snapped together and programmed through a touchscreen HMI with very basic logic (ie: digital output 1 [wired to heater] turns on when analog input 1 is less than 70 deg. C). Of course things won’t be named “digital output 1” but instead would be “heater ON output” and analog input 1 would be named “room temperature,” or whatever the user deems appropriate as a name. Since it’s to benefit education we’re also comming up with an entire curriculum for the project as well as documentation/etc.

My part in this is obviously VERY limited due to my current situation, but I was to be responsible for coding the base unit as well as the touchscreen HMI. Since I had already ordered the 4dsystems uLCD-32PT(GFX) module from sparkfun I decided to play with it and load sample code and start working on the HMI whenever I have time. I got sample code loaded and everything was cool until I tried to use the SD card. As soon as I tried to use it I was getting “Disk not mounted” and “unable to mount” or “Card OUT” depending on which sample program I ran. My card was 4gb, but was formatted for fat16 anyway and should have worked. As I pulled the card in and out while running the USDTEST sample program I noticed that the text on the screen quickly flickered to “Card IN” and back. I found that if I held the card @ just the right spot it would stay @ card IN. The problem was that I cheaped out and bought the least expensive piece of trash uSD card I could possibly find. It seems that the pads on it did not line up properly with the pins in the display module. As soon as I took a SanDisk uSD card it worked like a charm. I just wanted to post this b/c there seem to be several ppl. on the forums complaining that their SD cards don’t work despite being properly formatted. I tried to post to the 4dsystems forum but they require not only email validation, but subsequent manual approval of the account. I’m not exactly what you’d call a patient person, so hopefully when somebody searches for solutions ot this problem they’ll stumble upon this. That’s all for now, but I’ll be sure to post updates when I get cool touchscreen stuffs working 😀

Cheers!

Well, it has been a crazy couple of weeks. A few hours after my last post I noticed that one of my guitars had cracked so I had to deal with that and take it in to a luthier (thanks Fred!) and I have had a relative in the hospital for the last week so things have been absolutely insane. Luckily things are starting to normalize and, as promised in my previous post here, I am including a quick video of my Nintendo DS Touchscreen prototype using an Arduino. Unfortunately the first few seconds of the video got wiped out, but all of the important bits are in there so I couldn’t be bothered to re-encode it :D.

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DS Touch Screen Project

So my SparkFun order came in today. I received some IR LEDs, some IR ICs w/ EEPROM that can record IR signals from any remote, store them and then perform an action when they are detected again (by controlling digital output pins). I also got some Nintendo DS touchscreens and breakout boards for them and a few other little toys.

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