Maintaining room humidity level

Right humidity level in the room or other area is as important as temperature. Not enough humidity leads to dry climate and overall feeling. Indoor plants may suffer, you sleep quality may drop. In other hand to much humidity could damage materials, have effect on your health. Like everywhere – there should be some balance. In practice human feel better when environment is more humid than dry. Personally for me 50% to 60% relative humidity is best. But not all places naturally have good humidity. Especially when heating season starts, humidity usually drops and you need to thing of ways how to increase its level. Many people use wet towels or other passive ways. Other use humidifiers. __loovee__ from instructables have built his own arduino based automatic humidifier which constantly monitor humidity level and adds some humidity when it drops. He used DHT11 temperature/humidity sensor to detect humidity level. In order to add humidity he used water atomizer which is basically piezo element that vaporizes water. Arduino/Seeduino stores the threshold level which can be changed. He made acrylic enclosure which… Continue reading

Tweeting weather data with Raspberry Pi

Raspberry is a great small Linux machine which is ideal for connecting things to internet. Bunch of O/I pins allow connecting peripherals and sensors that can be accessed via web interface. Ferran Fabregas has been building a weather station with Raspberry Pi which sends data using Twitter application. Currently his set up reads temperature and humidity data from DHT11 sensor and light intensity with LDR photocell. Raspberry Pi runs a python script which takes care of reading data from sensors. He also runs a local webserver where data can be loaded in nice graphical format which is updated in real time. Continue reading

Arduino driven home automation botman

Simple home automation solutions can make your life easier. In other hand too much automation can be annoying. So there is always a middle between benefit and annoying. This is why there are so many attempts to build automation that differ from project to project. Johannes has been working on his version of home automater called “botman”. It is based on Arduino with Ethernet connection. “Botman” is capable of doing several things like measuring indoor temperature, humidity and barometric pressure (BMP085, DHT11). Then pull weather data from server via weather API. Also he though that he needs public transportation info which is also pulled from server. Indoor climate conditions is constantly archived in to Google Spreadsheet. And finally, to complete home automation concept, there is a Android API which allows controlling home appliances remotely. Home automater is placed in laser cut enclosure which also serves as front panel with laser cut engravings. Servo motor needle indicates weather conditions while other data is visible on LCD. Three push buttons are used to navigate the menu and select information. Continue reading

Simple Arduino based temperature tweets

Twitter is great and popular system for short messages. In your workplace it is likely that all coworkers will have Twitter account and all your messages will definitely reach then. This thought brings us to very practical use of twitter – temperature updates. Using Arduino, Ethernet shield and DH11 digital temperature and humidity sensor this can be done in no time. Steve decided to do just that. He set up Arduino temperature station which would tweet temperature and humidity values of office every 15 minutes. I know, this will become annoying in long time, but some fun is guaranteed. Sometimes it may be useful, for instance in the morning you can check temperature and decide your clothing. With freely provided code example you can find other uses of tweeting hardware messages. Continue reading

BO.Duino gives you more features

As the name sounds, it just another version of the Arduino, only with added features and pheripherals. It’s based on Arduino Duemilanova which is a version of Arduino having 32kb of memory at 16Mhz on an Atmega328. However this board that I am going to talk about features an on-board real time clock, including a SD card adaptor. Apart from the above two it also has an on-board RGB led, and an already interfaced external memory chip along with support to connect  a Dht11 sensor which is a temperature and humidity sensor working on SPI protocol The board should be configured as Arduino Duemilanova on Arduino IDE. A jumper is used to select the FT232 chip output level. The FT232RL enables you to programme a new firmware or change the bootloader without the need of extrernal programmer .The board power supply has to be manually configured. All the schematic and required code files are included and can be downloaded. Overall a good project, but I believe better board are availabel with more pheripherals on-board and with a better version of… Continue reading

Easy to build temperature monitor

The project is all about temperature monitoring and displaying with a twist. Instead of using a costly Arduino with a boot loader, the author used Arduino Nano as it’s cheap but it doesn’t have an on-board boot loader. He used a Bus Pirate V3B to flash the boot loader and save on some extra-bucks. In the initial phase, the author started with a DHT11 sensor which is a SPI based temperature and humidity sensor having digital output. However, since he wanted an accuracy in decimals, he shifted to DS18B20 which is again a SPI based temperature sensor from Maxim. It has an accuracy of +/- half degree Celsius. For displaying the graphs of temperature variations along the day, he used an old Nokia 5110 lcd which Is again very cheap to buy. He also decided to make small circular buffer for DS18B20 readings and draw that as scrolling graph, RRD style. At last step he also added PWM driven back-light to display which is off if value didn’t change, half-dimmed if current temperature is lower than previous one or full… Continue reading