I don’t know what am I doing wrong but upload is not working.
UART board driver is installed, COM port is active in Arduino IDE but when I try to upload an example from Gamebuino library nothing is happening on my Makerbuino. Also on UART board Tx and Rx LEDs are not working.
i even did a loopback test on UART board an it worked.
If you do the loopback test (without the MAKERbuino), do the LEDs flash? Have you connected the right way around? It should be connected like this, if you’re not using the extension cables:
Hmmm… Sounds like something is shorting. Can you measure VCC on the FTDI board when plugged in? The LEDs are directly driven by the FTDI chip, so I suspect that VCC collapses when you plug it in. Could you check that?