Temperature logger out of building blocks

Husham wanted simple portable temperature logger that would work outside reliably. He’s built electronic part out of several building blocks where control is given to Arduino Nano. Precise time is kept on RTC module based on DS1307. Temperature is measured with LM35 sensor. Data then is logged in to SD card which also is interfaced by using SD card module. Current temperature and time is also displayed on LCD screen. Special care is taken on building enclosure and adding basic control. So instead of using regular buttons he decided to add couple Hall effect sensors that would act as switches when magnet is brought close to area. One Hall sensor is used to turn LCD backlight and another for resetting microcontroller. Device is powered with couple Li-Ion batteries. Since it only logs data to SD card, eventually you need to take SD card out in order to load data to computer. Probably wireless interface like Bluetooth could make things much easier. Continue reading

Remote Arduino based temperature logger with ESP8266 module

Temperature loggers can be useful and vital in many places. For instance they can be implemented on greenhouses, freezers and other sensitive environments where temperature changes can cause trouble. Temperature logging can help finding weak spots in the system and help prevent failures in future. Some time ago temperature loggers relied on internal storage devices, where temperature data along time stamps were saved locally that later had to be loaded in to computer to visualize data. Today when internet of things services are here, logging can be done online without need of storing data locally. You can see logged data instantly, set alerts and even remotely control hardware. The only thing that is needed is constant internet connection. This is also not a big problem, because connecting to internet is easy as never. Whole logging system with WiFi can be set up for less than $20. noelportugal shared his simple demo on how to build a temperature logger that would send data to thingspeak.com which allows free connection to your device. Set up consists of Arduino Pro Mini 328 which… Continue reading

Temperature and humidity logger

chipkit temperature logger

Just like me, there would be people who are interested in monitoring temperature every now and then. Well, then this project is just made for you. The project is all about building a temperature and humidity sensor which will log all the data to the pc from time to time basis. It uses a DHT11 sensor which is an integrated sensor for both temperature and humidity and has a calibrated-digital output. It works on SPI protocol which is hard to integrate with any 8-bit controller. Another advantage of the project is that it doesn’t require wires as all the components are ‘plug-and use’ type. In this project, four pins of the DHT11 sensor is directly inserted into four I/O pins (7, 6, 5, and 4) of the Uno32 board. Writing firmware is easier with the use of the DHT11 library available for Arduino or chipKIT platform. The DHT11 library for Arduino was originally written by George Hadjikyriacou and was later modified by other people. On PC’s side, the open source programming language Processing is used to develop a graphical application… Continue reading

ChipKIT based temperature and humidity logger

ChipKIT is great development board with Arduino spirit. Just it uses 32-bit PIC microcontroller and has more flash and RAM memory. If have one here is a nice project based on ChipKIT UNO32. The only additional component to this project is DHT11 temperature and humidity sensor. It can be plugged directly in to ChipKIT header and be read. ChipKIT simply reads data from sensor and pushes it to serial interface. Not so much of performance requirements. The fun part is on PC side. The GUI is written in processing where nice window indicates current temperature in Celsius and Fahrenheit and relative humidity %. When Start Log button is pressed it starts logging these values along with time stamps. Great project for learning and fast use. Continue reading

Log up to 8 temperatures to a PC using RS232

If you want to have centralized up to 8 locations temperature readings – you should consider building this temperature logger. Design is really simple as it used up to 8 1-wire buss temperature sensors DS1820. Temperature sensor device is interfaced with LCD panel which is able to display up to 2 temperature values. It also has a separate DS1302 Real Time Clock (RTC) module with over 3 months backup. It also supports Wayne’s NTP format for updating the clock to a Time server. If you need to monitor more than two temperatures then you need to connect device to PC via Serial port. Any terminal software can be used for this. Full project files are available for download here. Continue reading

COM port powered temperature meter

This simple four channel temperature meter can be connected directly to your computer COM port and doesn’t require additional power supply. Check you computer back if there are any com ports before you start. Temperature meter is based on ATtiny15L microcontroller which has built in ADC. Power for this circuit is taken from com port ER and RS signal lines. High level of these lines is from 6 to 12V and can supply up to 5mA of current. As L series microcontrollers are low power this is more than enough. As temperature sensors there are four 103AT thermisters used. They give pretty good precision at room temperature (~0.3Cº). Author provides firmware for ATtiny15L and VBA project that logs temperature data to excel file. Continue reading