zondag 3 juni 2012
dinsdag 22 mei 2012
Still some problems
We also have a problem with our program for the arduino, it seems that using the NFC card reader with SPI and the I/O expanders with I2C work perfect separately but if we combine the 2 programs, only the SPI works and the I2C doesn't work anymore then. We are still trying to find what causes this problem, maybe the arduino is not able to use SPI and I2C at the same time or maybe it's something else, we don't know but we hope we'll find it soon.
maandag 14 mei 2012
finally some progress
here you can see the program code I used for this schematic:
donderdag 19 april 2012
test setup
maandag 16 april 2012
Printed Ciruit Board design
donderdag 1 maart 2012
Bi-color LED matrix
Below you can see the schematic for driving one segment, the other one is almost the same except for the hardware addresses of the remote 8-bit I/O expander PCF8574.
donderdag 16 februari 2012
some changes
We are have problems for the moment with finding a supplier in Europe who has a RGB LED matrix. It's surprisingly hard to find. We prefer to use the COM-00683 RGB LED matrix.
We are hoping to find an 8x8 RGB LED matrix and otherwise we will have to make it by ourselves with 64 separate RGB LED's. I also drew a schematic of the circuit we are going to use, you can see this here: A close up of the LED matrix:woensdag 25 januari 2012
Block diagram
Today we completed our plan of approach, we made some very important decisions and we drew rough a block diagram of our project. I'm going to give a little bit of information below about the parts of this block diagram.
We were not sure what we were going to do with the RBG LED's, eventually we decided to use a Digital Addressable RGB LED strip.
This Digital Addressable RGB LED strip has LED drivers build in on the strip, this is very useful because if we would make this by ourselves we would have an enormous PCB so we decided to order this as well. The LED drivers they use are the LPD8806 (in the newer versions of this product) and the HL1606 (in the older versions of this product). The color of the RGB LED's are controlled by using PWM.donderdag 19 januari 2012
Welcome
Now we are still gathering information by searching the web. More update about our project will be posted soon.