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22 Oct 2012

The MAX31855 performs cold-junction compensation and digitizes the signal from a K-, J-, N-, T-, S-, R-, or E-type thermocouple. The data is output in a signed 14-bit, SPI-compatible, read-only format. This converter resolves temperatures to 0.25°C, allows readings as high as +1800°C and as low as -270°C, and exhibits thermocouple accuracy of ±2°C for temperatures ranging from -200°C to +700°C for K-type thermocouples. For full range accuracies and other thermocouple types, see the Thermal Characteristics specifications in the full data sheet.

MAX31855 – Cold-Junction Compensated Thermocouple-to-Digital Converter - [Link]

21 Oct 2012

Ultra-Accurate Temperature Sensor Offers ±0.5°C (max) Accuracy Over a Wide -40°C to +105°C Range

The MAX31725 temperature sensor accurately measures temperature and provides an overtemperature alarm/interrupt/shutdown output. This device converts the temperature measurements to digital form using a high-resolution, sigma-delta, analog-to-digital converter (ADC). Accuracy is ±0.5°C from -40°C to +105°C. Communication is through an I²C-compatible 2-wire serial interface.

The I²C serial interface accepts standard write byte, read byte, send byte, and receive byte commands to read the temperature data and configure the behavior of the open-drain overtemperature shutdown output.

MAX31725 – ±0.5°C Local Temperature Sensor - [Link]

6 Aug 2012

The MAX44006/MAX44008 integrate six sensors in two products: red, green, blue (RGB) sensors; an ambient light (clear) sensor; a temperature sensor; and an ambient infrared sensor with an I²C interface. These highly integrated optical sensors include a temperature sensor to improve reliability and performance.

The devices compute the light information with six parallel data converters allowing simultaneous light measurement in a very short time. The devices consume only 15µA (MAX44006) and 16µA (MAX44008) separately in RGBC + TEMP + IR mode, and also have the ability to operate from 1.8V/3.3V/5.5V supply voltage rails.

RGB Color, Infrared, and Temperature Sensors - [Link]

3 Aug 2012

Controlling temperature has been a prime objective in various applications including refrigerators, air conditioners, air coolers, heaters, industrial temperature conditioning and so on. Temperature controllers vary in their complexities and algorithms. Some of these use simple control techniques like simple on-off control while others use complex Proportional Integral Derivative (PID) or fuzzy logic algorithms. In this project Shawon Shahryiar discusses about a simple control algorithm and utilize it intelligently unlike analogue controllers. Here are the features of this controller:

  • Audio-visual setup for setting temperature limits.
  • Fault detection and evasive action.
  • Temperature monitoring and display.
  • Audio-visual warning.
  • System status.
  • Settable time frame.
  • Data retention with internal EEPROM memory.

Intelligent temperature monitoring and control system using AVR microcontroller - [Link]


17 Jul 2012

DHTxx Sensors @ The Adafruit Learning System:

This tutorial covers the low cost DHT temperature & humidity sensors. These sensors are very basic and slow, but are great for hobbyists who want to do some basic data logging. The DHT sensors are made of two parts, a capacitive humidity sensor and a thermistor. There is also a very basic chip inside that does some analog to digital conversion and spits out a digital signal with the temperature and humidity. The digital signal is fairly easy to read using any microcontroller.

DHTxx Sensors Tutorial - [Link]

9 Jul 2012

raph @ raphnet.net writes:

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.

USBTenki: USB Temperature sensors and more - [Link]

9 Jul 2012

USBTemp provides a thermometer. It is based on the DS18S20 digital thermometers. In addition, the thermometer connects to an USB port – you can read the temperature using a commandline tool. In combination with RRDTool you can easily create temperature graphs

USBTemp – USB temperature measurement - [Link]

28 May 2012

 

Tools used:

  • U-EC6 USB Emulator Debugger
  • RF-2410M
  • RF-2410U
  • SHT11 Digital Humidity & Temperature Sensor
  • Battery Holder
  • Plastic Enclosure

Wireless USB Temperature & Humidity Datalogger - [Link]

28 May 2012

MerMar Designs – [via]

The Temperature Candle is a relatively simple design which essentially boils down to a 8-pin microcontroller, a temperature sensor and voltage reference and a RGB LED on a 1.5″ diameter PCB – the same size as a standard votive candle. The micro flickers the LED like a candle at a color determined by the ambient temperature. The color gives an indication of the room temperature in reference to the recommended sleep time temperature for
babies to reduce the risk of SIDS (Sudden Infant Death Syndrome).

The candle can also blink the temperature by pressing a reset button on the PCB.

This should be a relatively cheap kit and it uses all thru-hole components so it should be easy to assemble.  Using a simple micro, it can also be a good introduction to microcontrollers, and is designed with a jack to connect to Microchip’s Pickit 3 programmer / debugger.

You can see more information and look at all the design files on its project page.

The Temperature Candle - [Link]

27 Apr 2012

embedded-lab.com writes:

There are quite a variety of active analog temperature sensor ICs that provide an output voltage proportional to the temperature. They usually don’t require any external calibration and signal conditioning, and as such their output can be directly fed to the input of an ADC for digital processing. A few examples of such sensors are LM34, LM35, TMP35/36/37, and MCP9701. If you are having any trouble using any of these sensors in your project, here is a quick way to test if your sensor is working or not.

Testing active analog temperature sensors with a multimeter - [Link]



 
 
 

 

 

 

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