Using Digi Watchport/H USB Serial Humidity/Temperature Sensor in Linux
Ubuntu 9.04 has everything you need except for minicom. So all I had to do was to:
- plug it in
dmesg should get you the following output:
usb 2-9: new full speed USB device using ohci_hcd and address 50
usb 2-9: configuration #1 chosen from 1 choice
io_ti 2-9:1.0: Edgeport TI 1 port adapter converter detected
usb 2-9: Edgeport TI 1 port adapter converter now attached to ttyUSB0
- Install minicom:
sudo apt-get install minicom
- Edit minicom settings:
~$ minicom -s
-
Change the Serial Device to /dev/ttyUSB0
-
Change the Bps/Par/Bits field to 9600 8N1, (9600 baud, 8 bits, no parity, 1 stop bit). These are the default settings used by the Linux kernel; they can, if necessary, be overridden from the kernel command line by adding extra parameters to the console= option. See kernel-parameters.txt and serial-console.txt.
-
Turn off both Hardware Flow Control and Software Flow Control.
-
In the Modem and dialing menu, remove the Init string and Reset string completely if required.
- Save your new config
- start minicom
- more details
- Use one of the following commands:
| Command |
Description |
Return Value |
| ?<CR> |
Tells about the command set available for this Watchport |
as described in this section |
| I<CR> |
Tells what kind of Watchport is connected. |
Watchport/H<CR> |
| H<CR> |
Gives the percentage relative humidity. |
38%<CR> |
| T<CR> |
Gives temperature in Celsius. |
+22.2500C<CR> |
| TC<CR> |
Also gives temperature in Celsius. |
+22.2500C<CR> |
| TF<CR> |
Gives temperature in Fahrenheit. |
+72.0000F<CR> |
| TF+<CR> |
Repeats the TF command every 3-4 seconds until the next keystroke. Appending + also works with the TC and H commands |
+72.0000F<CR> |
| L4<CR> |
Adjusts the slew rate of the data line. When āLā is followed by a numeric value, 1 through 8, Watchport responds with OK. Other values return Invalid Command. The default setting is 4. Adjust the parameter until the data transmission becomes error-free. The setting remains in effect until the Watchport is power-cycled. |
OK |
Download Watchport’s manual
Now all I need is a perl script to automate the posting of these values to twitter?