Hi my dmx2-24 has this bug , any chance to borrow the pickit to fix my one ?
DMX2-24 - Interesting Flickering
- Thread starter Skymaster
- Start date
Hi. I am likely the user that contacted you by email. I have flashed the new FW, but I am still having this problem. I did notice that my PIC is a PIC16F887. Alan didn't mention this in his previous post so not sure if that would make a difference.
EDIT:
I see the PIC16F887 now. I did program with the "classic" switch in the on position when flashing. MPLAB said it was complete so I assume it worked.
EDIT:
I see the PIC16F887 now. I did program with the "classic" switch in the on position when flashing. MPLAB said it was complete so I assume it worked.
GrantBirrell
New elf
Does this only affect half the channels?
I am only planning to use half of the channels this blinky season, can I put off the firmware upgrade until next year?
I am only planning to use half of the channels this blinky season, can I put off the firmware upgrade until next year?
- Thread starter
- #51
In my case it was only affecting the even pairs. So 3/4, 7/8, 11/12 etc.
The others were fine so 50% were unaffected
The others were fine so 50% were unaffected
Hi Guys. I did some more testing last night. I found that with more light strings connected, the flickering was less pronounced. I had originally tested with only 1 string of 500 LEDs (250 each polarity). Once I connected 6 strings it smoothed out significantly, but still has a bit of flicker - especially when dimming.
- Thread starter
- #54
The dimming flicker is different to the fault described above. There is always a low frequency flicker as the H bridge is constantly alternating polarity to control the individual channels.
The fault above is a very obviously switch between channels where it's a misread of the DMX or timing issue I believe.
The fault above is a very obviously switch between channels where it's a misread of the DMX or timing issue I believe.
@GrantBirrell Have a chat to @Juddge
The fault was actually the board restarting due to a stack overflow error caused by subsequent bytes of dmx data coming in while the Pic is sending out the 24 channels worth of data to the pixel IC's that do the dimming. Depending on the start channel, and the number of channels being sent to the DMX2-24 the Pic could get in a loop where it kept trying to send out the data each time a byte occurred. Took ages to work out that this is what was the root cause and in hindsight the many dozens of lines of code that I changed could have been a single one.The dimming flicker is different to the fault described above. There is always a low frequency flicker as the H bridge is constantly alternating polarity to control the individual channels.
The fault above is a very obviously switch between channels where it's a misread of the DMX or timing issue I believe.
@GrantBirrell Have a chat to @Juddge