A couple of scientists wander into the unknown on an alien planet with a handheld device, when suddenly it starts clicking ominously, indicating that radiation levels are increasing. Generally employed to develop fall sensors, step counters, door opening alarms. Contains a temperature sensor and a 6 axis accelerometer/gyroscope for motion sensing. The best guide we found for making this comes courtesy of Dejan at How To Mechatronics. The Arduino Uno WiFi Rev 2 is a microcontroller board that is mainly based on the ATmega4809 microcontroller. The coding side of making this isn’t too complicated either. The most popular variants of Arduino are Arduino UNO, Arduino YUN, Arduino LEONARDO, Arduino NANO, Arduino MEGA. It’s not the simplest project in the world, potentially requiring you to make you own perspex casing (unless you can find a ready-made one), but it’s still an excellent example of the versatility of Arduino. You get two for one with this plucky project, which takes advantage of the HC-SR04 ultrasonic sensor to both measure distances of up to four metres and act as a spirit level. It’s easily one of the best interface creation apps out there. This project also uses the excellent Blynk app, which you can use to easily create your own dashboard for any number of projects. Now connect the relay signal pin to any digital pin of Arduino except pin 13. Connect the VCC of the relay module to the 5v pin of the Arduino and connect the ground of the relay to the ground of Arduino. Let's start with connecting the relay to the Arduino board. You’ll need sensors for gas (MQ135) and PM2.5/PM10 particles – the most prominent atmospheric pollutants. Assembling the Automatic Irrigation System.
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