I am (still :) ) trying to build a smartwatch using and Arduino Pro Mini 3.3v 8MHz, Atmega328. I breadboarded the entire thing, got the display, bluetooth, acc/gyro/mag working, etc. (thanks to these forums). I then proceeded to solder the entire thing together. After doing so, I hooked it up to my laptop (Macbook Pro running El Capitan) through a CP2104 UART Friend (https://www.adafruit.com/product/3309). I tried uploading the code (some minor edits), but got errors saying "Programmer not in sync". I got all sorts of avrdude resp codes, such as 0xf3, 0x43, 0x8a. I believe that is what they were, there were a lot of different ones :confused: . I tried undoing the edits, no change. I then tried the Blink example, no different.
The wiring is all exactly the same as when I had it breadboarded. The serial monitor still receives info from the Arduino about the gyro sensor, the bluetooth still shows on my phone. Before I put it all together, the UART Friend would flash rapidly, but now it blinks a few times before the IDE gives an error. The Pro Mini green LED also blinks a few times. I am suspecting that it is a problem with the boot loader, but not sure how to test it. Pins 11, 12, and 13 are hard to access at the moment, which I believe is the pins to use for burning the boatloader. I would like to know before tearing into it to find out ;)
I read that using the "Upload with Programmer" will disable the boot loader, and I think I may have done that at one point, but if I remember right it still worked after that.
If anyone has had these same troubles or has heard of them and knows how to fix it that would be great, thanks!