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Wireless Thermometer - 55 to + 125 C
Wireless thermometeris is a small module for measuring temperature in range -55 C to + 125 C and transmitting data to the computer. Data from thermometer receives  receiver, which  is connected to the PC via USB cable and is also powered via this cable. Temperature values are displayed on the monitor of a PC or notebook.
wireless thermometer
Wireless Thermometer
Range : - 55 C to  + 125 C
Hardware & software customisation.
Ask questions.
Usage : Technical parameters:
Remote measurement of temperature in range from -55 C to + 125 C. Temperature value is displayed on the monitor of a PC. Transmitting Range :
Size :
Acuracy :
Speed :		 200 m
55x50 mm
0,5 C
3 times/sec

Power suply : from 1 Battery 1,5V ( or NiCd 1,2V )

Sending frequency : ISM Band ( 868/ 915 MHz )

Paralel connecting : up to 100 wirelles thermometer connected is possible
Wirelles thermometer sends in free ISM Band 868 / 915 Mz and no license is needed. Sending output is 10 dBm. Sending range depends on many factors. In the wild is at least 200m. The range is mainly dependent on the antenna. This thermometer uses simple wire antenna.
Accuracy of measurement is not dependent on the state of batteries. Even with the gradual discharging batteries thermometer is also accurate.
Wireless thermometer - schematic
Thermometer schematic
Wireless thermometer is built from components that operates at low voltage 3,3 V. For power supply is used 1 battery 1,5 V.  Conversion from 1,5V to 3,3V performs DC/DC converter. Current consumption is 14 mA/3V.
As a temperature sensor is used DS18S20. It has an operating temperature range from -55 C to +125 C.
Temperature measurement ensures a PIC16F886 microcontroller. The microcontroller also manages data transmission to PC.
wireless thermometer schematic
External power supply.
Thermometer can work also with an external voltage +5 to +12 V. In that case batteries are not used and can be removed from the thermometer. Voltage from an external source is stabilized at 3,3V which is used throughout the thermometer.
Software for wireless thermometer
wireless thermometer software
Software features :
- shows the measured data in PC
- RFMeasure allows to communicate with up to 100 wireless thermometers at the same time
- switches bandwidth 868 MHz or 915 MHz ( EU or US Band )
- allows to change the frequency on which broadcasts thermometer
- enables log data to file ( .csv )
- software includes API interface to build custom applications

Software is available in the installation pack and installing is automatically. It works with Windows XP, Vista and Windows7.
Receiver for wireless thermometer
USB receiver
Receiver receives data from voltmeter and sends them via the USB interface to PC. Receiver is powered from a PC. Installation is similar to the other USB devices. More about is on page instalation.

Receiver configuration is performed in software RFMeasure. In the  menu Settings/Receiver are settings for receiver.
Receiver and wireless thermometer broadcast with 10 dBm output. With this output power is the range in the wild at least 200m.
Pictures
wireless thermometerwireless thermometer
Another voltmeters.
This page is still presented other types of thermometers. It is the USB thermometer and web thermometer. USB thermometer is connected to the PC via USB cable and the web thermometer measures voltage remotely - via the internet.