Is it possible to make something like this using an ATTiny85 or similar AVR micro? If so, can anybody help me and port the code? For some reason I don't like PICs very much, and I already have an AVR programmer. Thanks.
I have been trying to adapt this project to be used as OSD for FPV flying. Have a couple of 18F4550, 18F4450 etc. lying with me. So i want to re-use those. Would prefer to code in mplab X + PICkit2. I am unable to compile the code successfully. I am a newbie to micro-controller coding. Figured there might be some issues with the architecture difference (thus diff SFRs) between the 12F and 18F. Could you please point me in the right direction?
I still have one of these units I built a few years ago now (2009), it suffers from massive sync issues, I think it's because it can't detect the sync pulses correctly, I have a few 1881N chips, can you please advise on which pin of the 1881N goes to which pin on the 683 and what code changes are necessary to make it work?
I assume the sync jitter is just down to the PIC comparator and nothing else?
(15 February 2012, 11:20, last edit:15 February 2012, 11:21)
in addition, you can use a 20 MHz clock or lower, but text overlay will be shorter. you can increase text length (and reduce pixel size) on a PIC18 by using x4 PLL to get a 40 MH clock with a 10 MHz crystal
Hi, any PIC16, PIC18 or other MCU with a comparator and a timer should work with only a few adjustments you can use a PIC16F84A but you will have to add a video sync separator IC like LM1881 or equivalent. if you have video sync problems use it anyway, you can connect its composit sync output to a port on change interrupt pin instead of comparator interrupt.