This might end up being a BlinkUp issue, but since I just reflowed a new board it could be just about anything…
After power up, I’m getting a blinking red LED (about 500ms on, 3 second cycle). This doesn’t match any of the listed BlinkUp LED patterns so I’m trying to figure out what I’m seeing. It’s a 004m, brand new never been configured.
I initially had an amber light, then I tried and failed BlinkUp, now I’m seeing the red-only pattern.
Hugo, thanks again for your direction this morning. I got my second board into the pre-blink up LED pattern and was (I think) able to complete blink up - but my board is now giving me a single red LED flash just as the first one did.
Are you checking for flash before or after blinkUp? If after that’d continue to point to a flash problem. If you check the flash before then I must have a problem unrelated to the flash since I’m getting the blinkUp pattern…
I’ve also been tuning the blinkUp bias resistor. I think I have the value right now (I’m getting ~500mV swing voltage into the Imp from the optotransistor). Is there any chance I corrupted the flash/config as I was tuning?
I am using preprogrammed flash I ordered from the site by the way.
Some progress and a request for more help. I am now able to BlinkUp and clear settings reliably. However, after blinking up - and getting the green confirmation light - I am still going into the 500ms Red, 2.5s dark pattern. So I tried doing BlinkUp with WPS. I get the “WPS in progress” pattern and my router’s waiting for a client. But then I’m timing out. I can replicate this on two boards.
This would seem to point to an rf problem - but are there any other possible configuration issues or failure modes that might be the cause? I am on line power so I don’t think I’m having a power issue (but it’s a new board so…).
I am embarrassed to tell you. Failed to connect VDD_WLAN to, well, VDD. All those bypass caps were there though.
A quick solder bridge did the trick. I also incorrectly stuffed a .1uF bypass on the flash, which might have accounted for some of the problems. And I used a different photo transistor than the one on the breakout board and it needed a larger bias resistor (I think it could still use some tuning but I can save that for later).
I’m really glad I could get the Imp running - I should be able to shake out a lot more issues now than if I’d’ve had to spin the board to get the Imp up.