I really hope someone can help with this - using my device to power the lighting on a festival stage in a few days!!
Ok so I have made a 'boarduino' from the designs on ladyada. I am using a TTL cable to upload to a 328 with UNO bootloader on it. It has been working perfectly for some time and now, for no reason I can think of, it only works properly when receiving power from my macbook pro. The device is not receiving an serial data over usb to work, just power. If I plug the same TTL cable into my other laptops, no joy. The DC jack on the boarduino now gives the weird behaviour also.
The 'weird behavior' is that some DMX fixtures are not recieiving the correct data.. whereas if the device is powered by my macbook pro, it is!! I am totally stumped.
What could differ between powering from my macbook pro and off anything else??
Any help pleeaase!!