Glyn Hudson over at OpenEnergyMonitor has developed this remote temperature and humidity monitoring node, the emonTH:
The emonTH supports both the DHT22 (humidity and temperature) and DS18B20 either onboard or remote temperature sensor. The default software will search for the presence of either sensor at startup. If both sensors are found it will return humidity from the DHT22 and temperature from the DS128B20. If only the DHT22 is found it will return both humidity and temperature readings from this sensor, finally if only the DS18B20 is found only temperature readings will be returned. In the future I would to expand the code to support multiple DS18B20 sensors on the one-wire bus.
emonTH – Wireless temperature and humidity monitoring node - [Link]
Electric Imp Solar Powered Temperature Logger
The first hack I did with the imp was a solar powered temperature logger using a TMP36 sensor and send the data to ThingSpeak
Electric Imp Solar Powered Temperature Logger - [Link]
Scott Harden writes:
In an effort to resume previous work [A, B, C, D] on developing a crystal oven for radio frequency transmitter / receiver stabilization purposes, the first step for me was to create a device to accurately measure and log temperature. I did this with common, cheap components, and the output is saved to the computer (over 1,000 readings a second). Briefly, I use a LM335 precision temperature sensor ($0.70 on mouser) which outputs voltage with respect to temperature.
Precision temperature measurement - [Link]
Make a WiFi Weather Station With Arduino and Adafruit’s CC3000 breakout.
As open-source hardware users and makers, we love playing with new chips, boards and tools. And there is one chip which is quite popular these days: the CC3000 WiFi chip from TI. This chip comes with many promises: cheap (around $10), easy to use, low-power … It was featured in many articles around the web, but somehow it was quite hard to use with Arduino as there was no breakout board or library available. Luckily, Adafruit solved that for us with a nice breakout board and a working library for Arduino. In this article, I will show you how to use this chip for home automation purposes. Remember that weather station project? We are going to do the same: measure the temperature and the humidity. But this time we won’t display the information on an LCD screen. Instead, we will transmit the data wirelessly via WiFi to your computer and display it there. Excited ? Let’s get started!
Make a WiFi Weather Station With Arduino and Adafruit’s CC3000 breakout - [Link]
Maxim’s Collection of temperature sensor and thermostat ICs
These temperature sensors offer good accuracy (±1.5°C) over the range of -25°C to +125°C and feature a 2-wire digital output with bus lockup protection and external reset.
Tushar @ embedds.com writes:
In this new tutorial, we will be interfacing a LM35 based temperature sensor with ATMEGA32. The 3 main types are thermometers, resistance temperature detectors, and thermocouples. All three of these sensors measure a physical property (i.e. volume of a liquid, current through a wire), which changes as a function of temperature. In addition to the 3 main types of temperature sensors, there are numerous other temperature sensors available for use.
Interfacing LM35 to ATMEGA32 - [Link]
Digital Temperature Sensor in TO-92 Package Ideal for Measuring Ambient Temperature.
The MAX31820 ambient temperature sensor provides 9-bit to 12-bit Celsius temperature measurements with ±0.5°C accuracy over a +10°C to +45°C temperature range. Over its entire -55°C to +125°C operating range, the device has ±2.0°C accuracy.
MAX31820 – 1-Wire Ambient Temperature Sensor - [Link]
Gina Roos writes:
One of the biggest challenges faced by solid-state lighting designers is reliability. Electrical and thermal conditions are two major factors affecting device life and lighting output and, while long life is a key benefit of LEDs compared to incandescent and fluorescent light sources, all bets are off if the LEDs exceed their temperature ratings.
Thermal management continues to vex LED lighting designers, particularly for high brightness LEDs that continue to escalate in forward current while decreasing in package size. Couple this with potentially high-temperature applications such as streetlights and high-bay lighting in warehouses, and it becomes apparent that there is a major hurdle to overcome.
With an estimated 20 percent of global energy used for lighting, LED driver suppliers are more than aware of these challenges and are starting to integrate thermal foldback control into some of their designs to protect LEDs from failure and reduced lifetime due to high-temperature environments. Thermal foldback limits the LED temperature to protect against failure by reducing the LED current as the ambient temperature increases; this arrangement continues to decrease the current until the LED junction temperature returns to a safe operating temperature. The result is higher reliability, longer operating life, and, in some cases, increased safety.
How Thermal Foldback Improves the Reliability of LED Lighting Fixtures - [Link]
tvdl @ instructables.com writes:
This is a small project to get you started with the electric imp and a Thermistor so you can see how you can get temperature readings updating live on a web site. This instructable will address both the hardware and the web site along with all the parts in between. I’ve tried to keep it as simple as possible which means there are plenty of ways you can expand on it.
The first part will address the electric imp and how we connect a resistor and Thermistor to create a very simple circuit called a voltage divider and use the imp’s built in analog to digital converter to take a reading and calculate what the temperature is. I’ll also go into some detail on how the circuit and it’s components work.
Simple wireless temperature sensor updating web site with Electric Imp and Thermistor - [Link]
Ktulu_1 @ instructables.com writes:
The temperature in my office at work varies quite a bit depending on the time of day, season, and the whims of the other people I share the floor with. When I’m sitting at my desk shaking uncontrollably or sweating profusely it would be nice to know if it’s due to the temperature or just work related stress. A simple $5.00 thermometer would suffice, but where’s the fun in that? Making my own thermometer might cost ten times as much, but I might learn something in the process and it would be way cooler than any cheap store bought thing? I’d rather make something myself even if I have to pay a “maker’s premium.”
Tempduino – Arduino Based Temp and Humidity Display - [Link]