Digital humidity-temperature meter with analog display

Measuring temperature and humidity is really easy as there are many convenient sensors. Usually to measure humidity along with temperature there are combined sensors used like SHT21. Arduino even have libraries to get things working right away. ff you want to display things there are more options and of course more work to do. Normally digital sensors are reflected in digital displays, but sometimes we like to look things old fashioned. So in this case analog display can be used. Kerry D. Wong built such device with couple analog displays where one indicates temperature and another humidity. Analog displays are custom made where arrows are controlled with couple servo motors. Driving servos with Arduino is also easy so overall code in project takes only few lines of code. It is set to take readings every 0.5 seconds. Temperature scale ranges from 50 to 95 degrees Fahrenheit and humidity from 5% to 95%.   Continue reading

Humidity Controlled Fan

The project is having a really simpler name, but is extremely useful when it comes to day to day life. It’s actually a humidity controller bathroom fan which can be used in scenario where you don’t have any window in the bathroom. So even, a small shower would fill in the bathroom with steam. It features a DHT-11 humidity cum temperature sensor which works on SPI protocol a 12-V fan and a LED and of course an ATMEGA328 controller with an ARDUINO bootloader The advantage of using an ARDUINO boot loader was to provide the feature of firmware upgrade in the near future. Whenever the room humidity reaches a customizable threshold (50% by default), the device flashes the bright LED for a minute, to prompt the user to open the door of the room. After that delay, one of the two Darlington transistor boards kicks in and switches the fan on, causing the air within the room to circulate, until the humidity is restored below the threshold. The case for the device is an old bathroom perfume dispenser and it… Continue reading

Sense The Surroundings

Build your own stand-alone temperature and humidity display with this guide on Instructables. The temperature at any one office varies quite a bit depending on the time of day, season. Although you can get custom made thermometers in less than 5$, however the user decide to build his own even if it cost a way too much then normal sensors. The placement of device was layout on the Prema-Proto Board. The author used a completely open-source electronics design application named Fritzing. It’s compatible with Windows, OSx as well as Linux. Its libraries can easily be found on the internet The microcontroller used in this project is typically sold as a blank chip, but some vendors sell Atmel ATMega328P AVRs pre-programmed with the bootloader necessary to interface with the Arduino IDE. If you’re using a blank microcontroller, you’ll need to burn a bootloader to it with some kind of programmer. For the project you require a basic, DHT22 temperature-humidity sensor, a Prema-proto board , some caps, resistors, as well as multiplexed seven segment display along with an Arduino Continue reading