How to Set Up Temperature Sensors

Pin 1 on the U401 is located on the left, as you look at the board in the orientation above. Pin 30 is the pin on the far right. Note that all lines extend from J1 to J2. There are then some J1 lines that only connect to J2, and no other circuitry.

Description	Pin
Power	7
Ground	9
Data Pin - Port A, Bit 0	15
Data Pin - Port A, Bit 1	16
Data Pin - Port A, Bit 2	17
Data Pin - Port A, Bit 3	18
Data Pin - Port A, Bit 4	19
Data Pin - Port A, Bit 5	20
Data Pin - Port A, Bit 6	21
Data Pin - Port A, Bit 7	22
Data Pin - Port B, Bit 0	23
Data Pin - Port B, Bit 1	24
Data Pin - Port B, Bit 2	25
Data Pin - Port B, Bit 3	26
Data Pin - Port B, Bit 4	27
Data Pin - Port B, Bit 5	28
Data Pin - Port B, Bit 6	29
Data Pin - Port B, Bit 7	30

See http://www.usbmicro.com/odn/index.html for additional information.

U421 / U421-SC3 Pinouts

Except for the screw terminal, the U421 and U421-SC3 are exactly the same.  Pin 1 on the U421 is located on the lower left, as you look at the board in the orientation above. Pin 24 is the pin on the upper left. The lower row therefore is 1-12, the upper row is 24-13.

Description	Pin
Power	14
Ground	9
Data Pin - Port A, Bit 0	1
Data Pin - Port A, Bit 1	2
Data Pin - Port A, Bit 2	3
Data Pin - Port A, Bit 3	4
Data Pin - Port A, Bit 4	24
Data Pin - Port A, Bit 5	23
Data Pin - Port A, Bit 6	22
Data Pin - Port A, Bit 7	21
Data Pin - Port B, Bit 0	5
Data Pin - Port B, Bit 1	20
Data Pin - Port B, Bit 2	6
Data Pin - Port B, Bit 3	19
Data Pin - Port B, Bit 4	7
Data Pin - Port B, Bit 5	18
Data Pin - Port B, Bit 6	8
Data Pin - Port B, Bit 7	17

U451 Pinouts

Temperature sensors can be connected to Port A, bits 0 - 7.  Port B, bits 0 and 1 control the on-board relays, and Port B, bits 2 - 7 can be tied directly to additional external 5V relays.

See http://www.usbmicro.com/odn/index.html for additional information.

Setting Up Temperature Sensors in Home Domination

To add a temperature sensor to Home Domination, it's best if you have a temperature sensor already connected to a USBmicro USB controller and have the USBmicro controller plugged into the computer before starting Home Domination. 

If you're creating a new control file, on the "Choose Computer Interfaces to Use" dialog, simply check the "1-Wire Temperature Sensor" check box.  This will add a temperature sensor using the first USBmicro device it finds, using data bit 5 (the one that the screw terminal is set up for on the U421-SC3).  It will also add a sensor so it will appear in the sensors tab.  If you need it to use a different USBmicro device or a different data bit, then click the Device Setup, look for the "Temperature Sensors (1-Wire)" line, click the + so the devices show, select the device, and click Change.  Here you will be able to change the device or pin that is used, and you can also change whether it uses Celsius or Fahrenheit, and you can change how often it checks for temperature changes.  It takes about a second for it to read the temperature, so you cannot check the temperature more than once per second.

If you already have a control file set up, you'll need to go under Setup, then click Device Setup, select the "Temperature Sensors (1-Wire)" line, and then click the Add button.  This adds a temperature sensor device that uses the first USBmicro device, and data bit 5.  To change this, click the + button to show the devices, highlight the device and click the Change button.  Then change the USBmicro device or the data bit to use, or whether to use Celsius or Fahrenheit, and you can change how often it checks the temperature.

If you want to use multiple temperature sensors on a single data pin, each temperature sensor will have to be added as a separate temperature sensor device, but you will specify the same USBmicro device and data pin.  In order for it to work correctly however, you will need to assign the specific device id for each temperature sensor.

If you have a USBmicro device that was purchased on or after January of 2006 (firmware version 1.46 or greater), when you can click change on a specific temperature sensor under the "Temperature Sensors (1-Wire)" line, it will show you the ids of all the 1-Wire devices that are connected to a particular data pin. If you change pins, you will need to click the Update button to rescan the device.  Select a serial number in the "Connected 1-Wire Device" list and click Select.  This will instruct Home Domination to use that particular sensor when checking its temperature.  Each temperature sensor should select a different serial number to use.

If you have a USBmicro device that was purchased prior to January of 2006 (with a firmware version < 1.46), you can still use multiple temperature sensors on a single wire, but it's more difficult to set up.  You will need to only attach one temperature sensor to the wire at a time until Home Domination has the serial number for each device selected.  To set up temperature sensors, you would still add a separate temperature sensor device for each device on the wire, but you must do it one at a time.  This will read the serial number of the device on the wire, and then you can select it.  Then you would remove that device from the USBmicro device, attach the next temperature sensor to use, edit your next temperature sensor device in Home Domination and select the serial number to use (it can list only one).  Once all of the temperature sensors have individually been set up, then you can attach all of the temperature sensors to the same wire, and it will use the previously detected id to individually address each temperature sensor. 

You can change the name of the temperature sensor that gets added by clicking change on the Sensors tab, or you can do this under Setup and click Sensors and Switches.  You can use this sensor in macros too.  If you want a macro to act as a thermostat, you should set up two macros--one to turn a heating device on when it's below a certain temperature, and another to turn the device off when it's above a certain temperature (and vice-versa if it's controlling a cooling device).