Hi all,
I have made a custom arduino board using an atmega2560 and I'm at the point where I am trying to put the bootloader on it and then load a sketch. However when trying to load the bootloader, I am getting an error about the device signature.
avrdude: Device signature = 0x000000
avrdude: Yikes! Invalid device signature.
Double check connections and try again, or use -F to override
this check.
Here is my procedure:
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Load ArduinoISP sketch to my Uno
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Connect uno to mega
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Uno 10 to Mega reset
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Uno 11 to Mega 51
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Uno 12 to Mega 50
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Uno 13 to Mega 52
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Uno VCC to Mega VCC
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Uno GND to Mega GND
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Tools --> Board --> Mega 2560
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Tools --> Programmer --> Arduino as ISP
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Tools --> Burn bootloader
I'll attach a screenshot of my PCB.
If there's anything I'm doing wrong, please help!
Thanks,
Emanuel
whole board3.zip (102 KB)
Post the schematic.
I see from the routing: no decoupling caps on the VCC pins, ICSP socket looks different from the standard:
Pinout seen from above:
MISO 1 6 VCC
SCK 2 5 MOSI
Reset 3 4 GND
Vias to go thru the board look very close from the 2nd picture, could be shorting out?
You could have asked for a review here before purchasing boards.
ICSP socket is not standard, I'm just doing it with dupont wires to my arduino. The vias are close, but not touching. Verified with continuity. I should have asked for review, but based on my research this should be fine. The decoupling caps are the only thing, but I do have an output cap from the power reg IC. It's a 10uF between the 5v and gnd. Is this not sufficient? Seems like it's close enough distance-wise to the chip. Would the decoupling caps be causing such a big issue? Either way, I'm using the VCC from my Uno to power it at the moment so it shouldn't even be relevant right?
I wish I could post a helpful schematic, but I never actually organized it and made it look nice in Fritzing. I really just focused on the PCB view. I've uploaded the file in the original post if you want to take a look since I can't seem to upload it to my response here.
