I’ve built the Makerbuino. The initial tests checked out OK, and when soldering was complete the system starts up and performs setup tasks. The buttons all work etc. The step to flash from SD card is not working. Pressing C in the step to flash from SD is failing… Instead of doing something for 30s or so it shows ‘Flashing’ then reverts to the previous screen. This is the same behaviour as if I try with no SD card plugged in, so I guess that the problem is that the SD slot is not correctly soldered.
I’ve tested with a multimeter for continuity, but struggled to match the pin numbers from the circuit diagram with those on the SD card slot. The pin numbers from the ATMEGA are clear enough as theyre labelled on the PCB.
Counting pins up from the SD card notch to the tiny 3 unused pins gives 8 pins. I’ve called pin 8 the one closes to those 3 unused ones.
ATMEGA pins 16 is shows connected to SD 5 and 4; pin 17 to 5; pin 18 to 5 and 7; pin 19 to 5.
This suggests that I’ve managed somehow to make a mess of the soldering for the SD card.
What can you advise? Desolder the SD card slot and clean it up? Can you advise on how to identify the pin numbers on the SD card slot as that would help with testing for continuity correctly?