I've been experimenting with 7-segment LED's using the LedControl library and an ATtiny85, and I can get it to display a number, but it flashes on and then goes off and won't display another number.
I've had the same results with both versions of the LedControl library and the Max7219 library. I've tried adding capacitors on the power rails as some sites say, I've tried 10k and 22k ISET resistors, I've tried different ATtiny85's, I've tried 3.3v and 5v from regulated supplies, I've tried 2 different single-digit displays and a 4-digit display (all common-cathode) but nothing makes any difference, all I ever get is a flash of a digit for under a second.
I know the displays work ok as i've driven them directly using my raspberry pi, so i assume the problem is the max7219. I've tried 5 different MAX7219's but they're all from the same supplier, I'm starting to think they're fakes (given that most US/UK places sell them for £10 each and I got 5 for $2 from china).
This is max7219 7 segment
Has anyone had the same issue or any idea of something else I can try?
I've had the same results with both versions of the LedControl library and the Max7219 library. I've tried adding capacitors on the power rails as some sites say, I've tried 10k and 22k ISET resistors, I've tried different ATtiny85's, I've tried 3.3v and 5v from regulated supplies, I've tried 2 different single-digit displays and a 4-digit display (all common-cathode) but nothing makes any difference, all I ever get is a flash of a digit for under a second.
I know the displays work ok as i've driven them directly using my raspberry pi, so i assume the problem is the max7219. I've tried 5 different MAX7219's but they're all from the same supplier, I'm starting to think they're fakes (given that most US/UK places sell them for £10 each and I got 5 for $2 from china).
This is max7219 7 segment
Has anyone had the same issue or any idea of something else I can try?
