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Author Topic: Something’s gone wrong...  (Read 447 times)

Rupes

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Something’s gone wrong...
« on: December 08, 2019, 18:33:19 »

Hi.
I’ve built my DIY AstroEQ based on PCB and ICs sourced from Tom and components sourced from Farnell following the links in the parts list.

All looks OK but I’ve powered up (no motors connected yet) and something is not working.

Power light comes on.

USB light flashes indicating connection and the PC seems to recognise that something has connected but is unable to do firmware upgrades or establish operational comms with the AstroEQ as far as I can tell.

There’s no sign of life from the status LED. I’ve checked the LED itself and that’s OK. I’m wondering what simple checks I could carry out to help me diagnose the problem. I’ve had a good look at the soldering and have tidied up one or two connections but no improvement.

Thanks in advance for any help.
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TCWORLD

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Re: Something’s gone wrong...
« Reply #1 on: December 10, 2019, 20:41:23 »

Could you post a picture of the back on the PCB.

Also, what happens when you run the firmware update option with the config utility?

Did you connect +12V first before the USB connector?
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Tom Carpenter (AstroEQ)

Rupes

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Re: Something’s gone wrong...
« Reply #2 on: December 14, 2019, 13:54:02 »

Hi Tom

Here are some pics of the back of the pcb.

Yes, I did connect power first then USB.

I have just tried running the firmware update but after about 10 minutes it eventually got to the upload failed screen.
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Rupes

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Re: Something’s gone wrong...
« Reply #3 on: December 14, 2019, 13:55:26 »

Another PCB pic from the other angle
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Rupes

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Re: Something’s gone wrong...
« Reply #4 on: December 14, 2019, 13:56:43 »

Firmware update failed
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TCWORLD

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Re: Something’s gone wrong...
« Reply #5 on: December 19, 2019, 21:22:39 »

Apologies for the delay.

That soldering looks pretty good.
I would check the ground of C15 which looks like it hasn't taken. The same goes for one side of R15 which may be an issue.

Might also be worth checking pin 15 of the RA motor driver - the ground looks like a bad joint, though that wouldn't affect programming.

If that doesn't help, the next check is to make sure all pins of the ATMega and PIC are correctly in the socket (sometimes they can fold over or miss). You could also try removing and reinserting just to be sure.

Let me know how it goes.

Kind Regards,
Tom.
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Tom Carpenter (AstroEQ)

Rupes

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Re: Something’s gone wrong...
« Reply #6 on: December 21, 2019, 10:37:26 »

Hi Tom

Thanks for you help - I’m sure you have better things to do at this time of year.

I’ve checked and resoldered the connections for R15 and C15 and have removed and refitted the two chips - no folded legs.

Still no luck with the firmware upgraded - although I have noticed that sometimes it takes many minutes to go through the ten attempts/failures and sometimes it goes very quickly. Also it doesn’t always give the same failure message for each attempt. Not sure what this is telling us. I was fiddling with wires and pressing down on the chips when getting these mixed results.

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TCWORLD

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Re: Something’s gone wrong...
« Reply #7 on: January 06, 2020, 23:10:17 »

Hmm, not sure.

If you connect pins 10 and 12 of the PIC together and connect via a serial termial (e.g. PuTTY or similar), do you get data echoing back? That would rule out the PIC/USB as an issue, leaving just the ATMega.
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Tom Carpenter (AstroEQ)