The QK145 with the upgraded firmware is a PC controlled 4 channel temperature meter (deg C or F) using the serial port, a PIC12C509 and supports up to 4 x DS18S20 sensors. (One DS18S20 sensor included) No external power required. We think that each DS18S20 may be located over 200 meters away from the motherboard and PC.
This is an 8-pin micro-controller based circuit for temperature data logging via the serial port of any computer from between 1 and 4 remote digital temperature sensors, DS18S20 made by Dallas.
Provides real-time data via the serial port, by interfacing with up to 4 DS18S20 Dallas temperature sensors. It has an accuracy of 0.5 degrees centigrade. You must choose either Fahrenheit or celcius based on a jumper. There is no external power required, because it gets its power from the serial port. The data stream is easily logged & processed. You can run each sensor over 200m distance from the board.
We have not provided cables to connect between the kit and each remote sensor. But we do provide a harness and connector for easy connection of the cables to the PCB.