dangerousprototypes.com writes: [via]
Max Carter likes to experiment with Picaxe microcontrollers. He was looking for a way to take readings of the outdoor temperature and make the data available on the internet. He devised a project requiring minimal hardware, consisting of a Picaxe-08M, LM34 temperature sensor and a few discrete components. He programmed the Picaxe to take readings from the temperature sensor and communicate the temperature data to a PC via the serial port. (Note the absence of a need for a TTL-RS232 level converter chip, thanks to the Picaxe!) He then wrote the server configuration code and software for the PC to make the data available via the web. You can check out the online output from this project showing the temperature at Max’s place in Wyoming!
You can read the full details and download the PC and Picaxe code on Max’s website, along with his other informative Picaxe tutorials.
Outdoor temperature data server using Picaxe-08M – [Link]
Stephen Zahra writes:
This Digital Thermometer Design is done by using the 8051 microcontroller AT89C51AC2 and interfaced with an LCD to outputs the Temperature. THe sensor used for this design is the LM35 which output an analogue voltage per centigrade celcius. A circuit amplification is done between the LM35 and the microcontroller.
8051 Digital Thermometer – [Link]
Frank setup a internet-based temperature logger using the ThingSpeak contest data-logging service:
This project uses a mbed microcontroller (LPC1768 ARM Cortex-M3) to monitor temperature using a DS1620 (digital temperature sensor IC), retrieve the time via NTP (network time protocol), and then log the current temperature to ThingSpeak along with a time-stamp.
See a live graph here.
Internet-based temperature logger with mbed and ThingSpeak – [Link]
Woodstove Temp Monitor and Alert… [via]
Paul Westaway wanted to make sure his woodstove didn’t exceed the upper limit of temperature and overheat, thus damaging the stove or causing a fire. He wanted a monitor that could send out an alert if the stove got too hot. He was surprised he couldn’t find a monitor available commercially. So, like any enterprising Gadget Freak, he decided to make one of his own. Using a handful of inexpensive components, Westaway created his own Woodstove Digital Temperature Monitor.
Woodstove Temp Monitor and Alert – [Link]
I became interested in the ATtiny85 processor recently. Up till now, my projects were based on the ATmega328 or the ATmega644. The ATtiny85 is just that, tiny – only 8 pins vs. 28 on the ATmega328. The photo on the left shows the new X10 temperature transmitter, with the DS1621 temperature chip on the left and the ATtiny85 on the right.
X10 Remote Temperature – [Link]
Texas Instruments has launched a floating-point microcontroller (MCU) for operation under extreme temperature conditions from -55 °C to 210 °C, which it says is an industry first and exceeds the traditional 150 °C limit for high-temperature semiconductors devices.
Floating-point MCU operates at up to 210 C - [Link]
This digital temperature sensor design uses a twisted cable pair to read the sensor over long distances: [via]
This circuit is a simple and economical interface for remote IC thermal sensors. The temperature sensor (MAX6576), an absolute temperature-to-period converter that integrates the sensor with the necessary signal electronics, connects to the receiver (a MAX9140 comparator) using a twisted-pair cable that carries power to and signals from the sensor.
App note: Long twisted pair reads digital temperature sensor – [Link]
robots shares his design for a reflow oven controller: [via]
I have bought [an] oven. The main reason for this was to bake some PCBs. As with every reflow oven, this one needs temperature control as well.
I have baked several pcb without problem with unmodified oven. But that might be luck, as the temperature profile is nowhere near perfect.
I have therefore decided to make some simple temp controller to take care of the whole soldering process. As my oven features fan, I will probably want to control it as well. The controller should not to need any special programmer (mega can by programmed with BP) and the board should be etch-able at home.
Reflow oven controller – [Link]
The story of the triple nickel. Jeri writes – [via]
In this video I go over some of the history of the www.555contest.com and how it grew from a few random events. I also demonstrate an AM transmitter that broadcasts tones depending on the temperature of a thermistor.
The Story of the 555 contest and Temperature to Tone Transmitter – [Link]