Arduino Projects

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TM1637

Connecting TM1637 4x7 Segment Display to Arduino

http://tronixstuff.com/2014/12/01/tutorial-using-ds1307-and-ds3231-real-time-clock-modules-with-arduino/

DS3231

Setting Time for first usage

DS3231 RTC Clock Using Non-Rechargeable Batteries

http://www.raspberrypi-spy.co.uk/2015/05/adding-a-ds3231-real-time-clock-to-the-raspberry-pi/
http://woodsgood.ca/projects/2014/10/21/the-right-rtc-battery/

DS3231 RTC Clock with Display

http://www.instructables.com/id/Real-time-clock-using-DS3231-EASY/step3/The-code/

Library

http://www.rinkydinkelectronics.com/library.php?id=73

HC-SR04

HC-SR04 UltraSonic Distance Sensor with TM1637 Display

https://codebender.cc/sketch:212841#Distance%20Sensor%20TM1637.ino

Library

http://playground.arduino.cc/Code/NewPing

MQ-2 Gas Sensor

MQ-135

If you're using the sensor for the first time, it's a good practice to leave it powered on for about 24 hours before getting a good read. Don't skip this step.
then comes the calibration process. just calibrate it to get about 100-150 from analogRead in a good air condition.
normal air returns ~100-150
alcohol returns ~700
lighter gas returns ~750+

DS18B20

http://www.tweaking4all.com/hardware/arduino/arduino-ds18b20-temperature-sensor/

Misc

Versatile Kitchen Timer

Game of Thrones

http://www.instructables.com/id/Game-Of-Thrones-Theme-on-Arduino/?ALLSTEPS

Led Cube 3x3x3

http://circuitdigest.com/microcontroller-projects/making-3X3X3-led-cube-with-arduino

Reed Switch

http://www.electroschematics.com/9328/arduino-security-alarm-reed-switch/

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