In this library, data pin on RF transmitter breakout is connected to digital pin 12 on Arduino for data transmission by default. In preparation to use the RF module, another library needs to be installed – the virtual wire. More details and DHT11 library please visit previous blog and wiki page. Pin S on the DH11 breakout is connected to Arduino Uno pin 2. The transmission occurs at the rate of 1Kbps- 10Kbps.The transmitted data is received by an RF receiver operating at the same frequency as that of the transmitter.ĭHT11 sensor is basic and cheap device for hobbyists who want to do some data logging, which is good for 0-50C temperature and 20-80% humidity with 2-5% accuracy. An RF transmitter receives serial data and transmits it wirelessly through RF through its antenna connected at pin4. The transmitter/receiver (Tx/Rx) pair operates at a frequency of 433 MHz. This RF module comprises of an RF Transmitter and an RF Receiver. This kind of modulation is known as Amplitude Shift Keying (ASK). In this RF system, the digital data is represented as variations in the amplitude of carrier wave. The corresponding frequency range varies between 30 kHz & 300 GHz. Comparing with Xbee, RF module is the cost-effective wireless device for remote control and data transmission, as the name suggests, the RF module operates at Radio Frequency.
Arduino Uno ( this will be the transmitter with DHT11 sensor attached).
Receiver station receives data from transmitter and displays it on 16X2 LCD Keypad shield. Transmitter station that can be placed anywhere you want to monitor collects the temperature and humidity data and transmit it to receiver station. This time I would built up a wireless temperature and humidity sensor with RF modules. Ranging from a phone application that alert you to pakage your diliveries to a solar powered wireless radiation monitor by Geiger counter measuring the background radiation outside the house and transmit it to a display monitor inside the house. With varieties of projects out there, Arduino has bring custom home automation to everyday life. Wireless temperature and humidity sensor with RF modulesĪrduino has been extensively used for home automation, it is more flexible and cheaper than commercial solution.
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