Hello guys :)
I've recently been messing with PWM and this LED bargraph driver to be able to use 8 of them for a certain project I want to do. I got over the first few hurdles with it, which were mostly fixed by adding a RC filter between the PWM pin and the signal input.
Here's a video: https://www.youtube.com/watch?v=dldXSlcuJic
Here's the schematic:http://i.imgur.com/kNOFVlP.jpg *note the diodes on there at the top are actually LEDs yes and the bottom two resistors are both 3k9
The datasheet: http://www.ti.com/lit/ds/symlink/lm3914.pdf
The problem is pretty self explanatory from the video: It shouldn't be going two ways and I'm not sure why it does! Can anybody shed some light on this?
Thank you in advance!