emontTx v2 program header pinout

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?



Robert Wall's picture

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.

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.