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Ultrasonic Sensor (HC-SR04) Arduino Basic Example

The following tutorial will show you the bare minimum code required to use an ultrasonic sensor (HC-SR04) with arduino. In this tutorial the measured value will be shown in the serial monitor in “cm”. Ultrasonic distance measurements comes for the nature. It is based on the time travelled by a source of sound reflected from …

Arudino Uno – DHT11 Temperature, Humidity sensor

DHT11 is a very low cost digital temperature and humidity sensor. It contains a capacitive humidity sensor and a thermistor to measure the surround air. The sensor uses a digital pin. The digital pin uses a pullup resistor. This resistor is needed if the sensor itself does not contains it. Compared to the DHT22 this …