Freetronics Dot Matrix Display on Teensy 3.6

Status
Not open for further replies.
J

jarednew

New member
Hello,

I am new to all this, I have got other parts of my project working but cannot get anything displayed on my Dot Matrix Display.

I am using a Teensy 3.6 and a FreeTronics Dot Matrix Display (https://www.freetronics.com.au/products/dot-matrix-display-32x16-red)

I have downloaded all the libraries and am simply running the demo code.

I am running the Teenys outputs via a logic level converter to get the 3.3V to 5V (https://www.sparkfun.com/products/12009)

I have changed D8 -> D10 in the DMD.h to align with the Teenys Clock Select. I have changed PIN_OTHER_SPI_nCS to 1 (and others) to avoid a conflict.

When I power up and run my finger over the jumper cables I get lots of flashing lights but as soon as I connect it to my breadboard I get blank.

I am thinking maybe the clock speed might not be compatible? But wouldn't know where to start and I only say that because I am totally out of other ideas...

Any assistance of where I might be going wrong would be great.

I don't have a logic analyser but that might be my next option...?
 
I don't have a logic analyser but that might be my next option...?
Click to expand...

I can recommend this. Stupidly low price for what it does. It can be found under various other names in the web.

Capture.JPG
 
Try to find a datasheet and see if the display accepts 3.2V logic levels.
The logic level converter might be the problem. Most are incredible slow - too slow for this kind of usage.
 
Thanks BriComp, I will have a look at the analyser.

Thanks Frank B, I have had a quick search and it looks like it might be able to work off the 3.3V I will try a different library.

Could you please assist and confirm I am using the correct pins, images.png

The attached is the pin out if using the Arduino, I am using the same except changing D8 -> D10.

I think the others should all be ok?

Thanks,
 
Status
Not open for further replies.
Back
Top