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Posts Tagged ‘temperature’

Simple and small temperature fan control

Monday, August 10th, 2015

Xristost published a new build, a simple and small temperature fan control: I published this schematic long ago in this article: Adjustable power supply and since then I made some improvements in PCB to make the board as small as possible. The idea is to be easy to attach the...

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Posted in DIY, PCBs | No Comments »

App note: Calibration of the AVR’s internal temperature reference

Saturday, November 29th, 2014

Another app note from Atmel, calibration of the AVR's internal temperature reference (PDF!) This application note describes how to calibrate and compensate the temperature measurements from the ATtiny25/45/85. It can also be used on other AVR® microcontrollers with internal temperature sensors. The temperature measurement is based on an on-chip temperature sensor that...

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Bus Pirate v3 and LM75 temperature sensors

Wednesday, November 5th, 2014

Brixit writes, "This is a tiny reference for reading the temperature with an LM75a temperature sensor and a Bus Pirate v3 on a Linux computer."   Get an assembled Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.

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Posted in Bus Pirate, sensors | No Comments »

Temperature and humidity measurement with DHT11

Monday, July 7th, 2014

  Ondrej Karas of DoItWireless writes: This article describes temperature and humidity measurement with DHT11 sensor connected to TR module. Circuit diagram is very simple. You need only power supply for sensor and one wire for data line. This line has to be “pull-uped” – sensor has open colector output.

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Posted in measurement, sensors, wireless | No Comments »

Temperature compensation for an Arduino ultrasonic distance sensor

Friday, May 30th, 2014

Sverre Holm writes:Ultrasonic distance sensors can find the range out to 2-4 meters and are popular in e.g. robotics. Here I look at how the accuracy can be improved by compensating for the variation of speed of sound with temperature. It actually varies quite a lot in air and around...

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Posted in Arduino, sensors | 1 Comment »

DIY digital desk clock with temperature display -part 1

Wednesday, March 19th, 2014

A digital desk clock with temperature display feature by Electro-Labs: The brain of the circuit is a Microchip PIC18F252 microcontroller. It acquires precise time information from DS1307 real time clock via I2C interface and displays it on four digit 38 mm seven-segment display with the help of MAX7219CNG display driver....

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Open source data logger for biodiversity research

Friday, March 7th, 2014

Ed Baker of the Natural History Museum, London, UK, has published a paper outlining his build of an open source hardware data logger for scientific purposes. "Proprietary data loggers can be expensive - for example a three channel data logging system is available from Alphatemp for £465.00. Such costs make...

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Posted in open source, sensors | No Comments »

OctoPROBER rev0 board update

Friday, February 7th, 2014

Parker Dillmann posted an update on his OctoPROBER board  an 8 channel K-type thermocouple temperature logger, we wrote about it previously: I was having an issue with the FT230X being active while the 3.3V rails being turned off. The FT230X would backfeed voltage down the TXRX lines into the propeller which would power the...

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OctoPROBER, The 8-Channel temperature logger

Wednesday, January 8th, 2014

Parker Dillmann of Longhorn Engineer is working on a 8 channel K-type thermocouple temperature logger, the OctoPROBER: This has been an idea I have been kicking around for awhile. The OctoPROBER is a 8 channel, K-type thermocouple temperature logger. It has a micro SD card slot for logging data remotely. The USB...

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Posted in open source | 1 Comment »

App note: Temperature measurement using thermistors

Sunday, December 22nd, 2013

Another temperature sensitive device, introducing the thermistor. From its name you could guess that its a temperature dependent resistor which varies its resistance as the temperature changes. See Cypress' application note on using these devices. A thermistor is a temperature-sensitive resistor in which resistance varies with temperature. There are two...

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Posted in app notes | 2 Comments »

App note: Temperature sensing using diode

Sunday, December 22nd, 2013

Last time we covered using watchdog timer as temperature dependent component of a microcontroller to do temperature sensing. Now lets take a diode to do the same thing, they are pretty much accurate and cheap, see Cypress' application note about its implementation. There are various sensors available for measuring temperature...

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Weather station

Tuesday, October 29th, 2013

Xose Perez of Tinkerman has written an article detailing the build of his weather station: Arduino FIO based weather station with a DHT22 temperature & humidity sensor and a BMP085 barometric preassure sensor. The whole sensor will be powered by a solar panel (doubling as irradiance sensor) and backed by a LiPo cell.

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Posted in Arduino, sensors | No Comments »

emonTH – Wireless temperature and humidity monitoring node

Friday, October 18th, 2013

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...

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Posted in open source, wireless | 1 Comment »

PIC16F74 – room thermostat with colour LCD

Wednesday, February 27th, 2013

[embed]http://www.youtube.com/watch?v=4ycZfREuOgc[/embed] Room thermostat with PIC16F74, DS1820, and the Siemens M55 color LCD: The heart of the unit is an 8 bit PIC16F74 microcontroller from Microchip. It’s main task is to constantly monitor the room temperature trough a 1–wire digital thermometer IC, a DS1820 from Maxim, and to switch a relay...

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Posted in measurement, PIC | No Comments »

AVR based intelligent temperature monitoring and control system

Wednesday, August 8th, 2012

Shawon designed, and built an AVR based intelligent temperature monitoring and control system. He documented both the hardware, and the firmware on his blog, with in depth descriptions on how everything works. Controlling temperature has been a prime objective in various applications including refrigerators, air conditioners, air coolers, heaters, industrial temperature...

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Posted in AVR, how-to | 3 Comments »

Measuring temperature with Duinomite and KTY81

Saturday, January 21st, 2012

Olimex has posted this project for measuring temperature in range -55+150C for a solar water heater system. It uses the KTY81/110, a low cost PTC thermistor from NXP. The MCU board is the Duinomite we features in a previous post. Via the contact form.

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Posted in Arduino, measurement | No Comments »

Interfacing a DHT11 humidity and temperature sensor

Monday, January 16th, 2012

Raj show how to interface his PIC16F breakout board with the DHT11 humidity and temperature sensors. The DHT11 uses a proprietary single-wire protocol, not Maxim's 1-Wire (which we consider EOL). This articles discusses the DHT11 sensor which also provides calibrated digital outputs for temperature and humidity but is relatively lot...

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Posted in tutorials | 8 Comments »

RS-485 temperature sensor source files uploaded

Friday, November 18th, 2011

As a follow up to his RS-485 temperature sensor board, Ezflyer added PCB and schematic files: I've been meaning to post the Eagle schematic and board files for this project for a while now, but never got around to it. An email from a forum member (thanks Karel!) interested in...

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Posted in dev boards | No Comments »

PIC LCD backpack free PCB build and hack

Friday, October 14th, 2011

Having built a free PIC LCD backpack PCB, Ezflyr decided to hack its pins to use with his temperature and humidity sensor. He successfully adjusted LCD backpack's firmware, and developed a small app to display the temperature and humidity information on the computer. Via the forum. If you build a free PCB...

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Posted in builds, hacks | No Comments »

Pressure and temperature sensor demo

Friday, June 3rd, 2011

Here's Big Mess o' Wires simple pressure and temperature demo: I described an idea for a hiking data analyzer based around an old cell phone LCD, a pressure/temperature chip, and an ATmega microcontroller. Since then, I’ve received the parts and built a simple demo that exercises everything. It’s not very...

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Posted in hacks | No Comments »

Recent Comments

  • Cyk: Well, this is an application that I'd solve with an Android smartphone. Used Moto G phones can be found on Ebay for ~€30, and thanks...
  • Noy: Yuuup
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  • KH: I guess this is a failed attempt at making a pass/fail cable tester out of discrete ICs. A single pass/fail LED is not that useful....
  • Max: Considering it only seems to test that all wires conduct, I'm not sure what exactly does this show you that 7 LEDs each powered through...