Cannot get i2c readings with USB board

[borch84]

Hi, I am trying to get readings from my EC sensor. I have already connected my EC chip to my USB EZO isolated board. The board is detected by my rapsberry pi, but when I send the R command to get a reading I cannot get any return value

`pi@aws-rpi02:~/Raspberry-Pi-sample-code $ sudo python2 ftdi.py

Welcome to the Atlas Scientific Raspberry Pi FTDI Serial example.

Any commands entered are passed to the board via UART except:
Poll,xx.x command continuously polls the board every xx.x seconds
Pressing ctrl-c will stop the polling

Press enter to receive all data in buffer (for continuous mode) 

Discovered FTDI serial numbers:
('\nIndex: ', 0, ' Serial: ', u'DO009HTS')

Please select a device index: 0

('>> Opened device ', u'DO009HTS')

Any commands entered are passed to the board via FTDI:
Enter command: R
Enter command:`

If I run the i2cdectec command I dont see the chip address:

pi@aws-rpi02:~/Raspberry-Pi-sample-code $ sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- --

However if I connect the EC chip directly to my raspberry pi I can get readings from it:

`pi@aws-rpi02:~ $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- 64 -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
pi@aws-rpi02:~ $ cd Raspberry-Pi-sample-code/
pi@aws-rpi02:/Raspberry-Pi-sample-code $ ls
AtlasI2C.py AtlasI2C.pyc ftdi.py i2c.py LICENSE README.md uart.py
pi@aws-rpi02:/Raspberry-Pi-sample-code $ sudo python2 i2c.py

Atlas Scientific I2C sample code
Any commands entered are passed to the default target device via I2C except:

• Help
  brings up this menu
• List
  lists the available I2C circuits.
  the --> indicates the target device that will receive individual commands
• xxx:[command]
  sends the command to the device at I2C address xxx
  and sets future communications to that address
  Ex: "102:status" will send the command status to address 102
• all:[command]
  sends the command to all devices
• Poll[,x.xx]
  command continuously polls all devices
  the optional argument [,x.xx] lets you set a polling time
  where x.xx is greater than the minimum 1.50 second timeout.
  by default it will poll every 1.50 seconds

Pressing ctrl-c will stop the polling

--> EC 100

Enter command: r
Success EC 100: 13090
Enter command: r
Success EC 100: 13090
Enter command: r
Success EC 100: 13090
Enter command: r
Success EC 100: 13090
Enter command: r
Success EC 100: 13090
Enter command: r
Success EC 100: 13010
Enter command: r
Success EC 100: 13010
`

Any input why I cannot get readings using the USB isolated board but I can get readinds from the EC chip connected directly to my RPI?

Thanks.

[Atlas-Scientific]

The USB carrier board works with UART mode, not I2C mode. Set your circuit to UART mode (green LED) when you put it into the USB board.