3190 - 4-Channel Temperature Monitor & Control Relay Board

4 channel computer serial port temperature monitor and relay controller with four inputs for the Dallas DS18S20 (or DS18B20) digital thermometer sensors. The four relay channels provide output control and are independent of the sensor channels giving you the flexibility to setup the linkage any way you choose.

Commands for reading temperature or controlling relays are sent via the RS232 interface using simple text strings. The board can be controlled with a simple terminal or communications program (such as Windows HyperTerminal) or our free Windows application (see below for details).

Relay outputs are rated to switch resistive loads of up to 5 Amps @ 240Vac/24Vdc max.

Supplied complete with box.

Application Ideas

This board is an ideal use for old computers - continuous temperature data monitoring and control. A few ideas of how this circuit can be used as given below (additional equipment/software may be required):

• Simple weather reports for web pages
• Computer server monitoring
• Computer power supply temperature warnings
• Redundant critical systems monitoring
• House temperature monitoring
• Complex home automation tasks (start fan if warmer outside during Summer)
• Refrigerator monitoring and testing
• Brewing temperature regulation
• Fish tank heater verification
• Microclimate logging (ground versus air temperature)
• Primitive locking (using serial number)

Need More Information?

• User Manual
• View DS18S20 Data Sheet

Additional Items Required

• Power Supply: Regulated 12Vdc (Order Code PSU445 is suitable)
• DS18S20 temperature sensors to populate the four inputs GB£3.95 each (see below)
• cable for sensor connection (Order Code CAB859 or CAB588  - see User Manual for details)
• M-F Serial Port Lead (Order Code LDC441)

Kit Form or Assembled?

• This item is Available in Kit Form (KT ) or Assembled (AS) more