Hi, I 've got a emontxV2, and after buildup , I try to uploand the firmware, with a standard usb-->TTL-UART cable, but with ubuntu, windows7, and xp, I always recive the same error, avrdude: usbdev_open(): did not find any USB device "usb"
if I try lsusb, I can see the usb ---> serial port.
My question is, Need I a specific cable by the openenergy shop?
Witch is the pin out of the program header?
Do I need to use all the pins?
Witch is the order TX, RX, 5V, ?
And at the end, need I also a supply power by usb, to program or is anought the power by the header?
Re: emontTx v2 program header pinout
The circuit diagram and pcb layout is here: http://solderpad.com/openenergymon/emontx/
You do not need power via the USB socket (which is only used for power) while the programmer is connected via the FTDI interface.