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The purpose of this project was to design and implement a reliable and cost effective wireless temperature sensing system for the recreational spa industry. This wireless product has potential applications in many other areas including, salmonid enhancement hatcheries, private/public tubs, and indoor/outdoor pools. [via]

Wireless Spa Temperature Sensing System - [Link]

This document describes the development of Cytron Technologies DIY (Do It Yourself) Project No.11 (PR11). This project will use PIC16F876A to control NPN power transistor (BD135) further drive DC brushless fans, LEDs and buzzer when the certain temperature was detected. The value of temperature always displayed on a LCD screen. Circuit schematic and PIC source code will be provided.

Temperature Control System using LM35 - [Link]

The heart of the circuit is the LM35 temperature sensor which is factory-calibrated in the Celsius (or Centigrade) scale with a linear Degree->Volt conversion function. The output voltage changes with temperature from 550mV (-55oC) to 1500mV (150oC). This greatly simplifies the thermostat designed only need to provide a precision voltage reference (TL431) and an accurate comparator (A1 of LM358) in order to construct a complete thermostat.

Electronic Temperature Controlled Relay - [Link]

The PIC microcontroller stores all of the temperature change entries as a table in its EEPROM memory, and keeps track of which is the current entry based upon the time it reads from the RTC. Every five seconds, the RTC is accessed. Then, the current temperature change entry is calculated. And finally, the temperature sensor is updated with the new alarm temperature.

USB thermostat with PIC18F252 - [Link]

The High Altitude Photographic Balloon use a Parallax BS2px and is responsible for reading and recording latitude, longitude, time, altitude, internal capsule temperature, external capsule temperature, and taking pictures. Additional responsibilities include managing memory storage, relay controls, and audible signals. [via]

High Altitude Photographic Balloon - [Link]

This is a test project built hastily on a solderless breadboard. It uses a LM75 to read the current temperature via I2C and displays the result on three 7 segment displays. It uses a PIC16F628 with an internal 4 Mhz clock.The program was created using JAL.

LM75 Temperature Sensor with 7 segment display output - [Link]

The EnvStick is cheap, homemade temperature sensor that plugs into a USB port. It provides a simple way to collect a room’s ambient temperature.The EnvStick shows up as a serial port – a COM port on Windows boxes. You can see the typical output (on a program like Hyperterminal) – it waits a specified number of seconds, spits out a temperature reading, and starts waiting again. If you press “p”, you can set the number of seconds in between each temperature reading. [via]

EnvStick USB temperature sensor – [Link]

Just a handful of components builds a PIC12C509 8-pin microcontroller based circuit for temperature logging via a serial port; small, fast, and acceptably accurate. [via]

Quozl’s Temperature Sensor - [Link]

USBTenki is an electronic project to interface sensors to an USB port for collecting weather related data such as temperature. The firmware supports many different sensors and interfaces. It is up to you to decide what your USBTenki will support. [via]

USB Temperature sensors - [Link]

This is a standalone temperature and fan monitoring and control unit for the PC. It uses the temperature readings to adjust fan speeds in order to regulate temperature and noise. The system is flexible in that it can be configured to be either completely autonomous, or set up to be configurable. It is also highly configurable in the setting up of the features and parameters. The entire unit is controlled by the 2 Atmel Mega32 MCUs – 1 for the main control unit and 1 for the RF remote control, with inputs to the ADC (for thermal sensors), port pins, RS232 serial connection and output to the LCD, port pins and RS232 serial connection. The RF remote control controls specific settings of the unit. The main unit is powered off a standard 4-pin PC Molex power connector while the remote control is powered off a 9V battery. [via]

PC temperature control - [Link]