Control phidget

Phidget, connected to PC, is present in system as ttyUSBx, so you may use dmesg to clarify which device is assigned.

Before usage, phidget have to be initialized

$ echo -n -e "\x50" > /dev/ttyUSB1
$ echo -n -e "\x51" > /dev/ttyUSB1

After that you can turn relay ON or OFF by setting corresponding bit starting from 0.

Below we

• turn on relay 1
• turn on relays 1 and 2
• turn off both relays

$ echo -n -e "\x1" > /dev/ttyUSB1
$ echo -n -e "\x3" > /dev/ttyUSB1
$ echo -n -e "\x0" > /dev/ttyUSB1