Message with a good checksum received, dump it. If (driver.recv(buf, &buflen)) // Non-blocking Uint8_t buf //this is the buffer we use to save the received data The Receiver #include //including the library The last 2 are not used.Ĭonst char *msg = 'Hello from ' ĭnd((uint8_t *)msg, strlen(msg)) //converting char array *msg to uint8_t and handing it over to the module to be sentĭriver.waitPacketSent() //halt execution until all data has been sent So arguments are bitrate, transmit pin (tx), #include // this is not used but needed to compile The Transmitter #include //including the library The following is an example for sending the temperature from one Arduino to another by means of radio communication over 433Mhz band. Follow the instruction to install a library in this post, if you find any difficulties. Radio Head on the other hand is well documented, periodically updated and supports multiple protocols and devices. I used Virtual Wire for some time but I had intermittent issues when using this library. In my opinion, the best most robust Arduino library for Radio communication is the Radio Head library. The DATA pin can be attached to any digital pin on both modules. The receiver has 4 pins, 2 of them are labelled as DATA, you need to use only one, either or. The transmitter operates at voltages between 3.3v and 12v (but check with your supplier), the higher the voltage the better the range. An antenna may increase the transmission distance from a few cm to a couple of meters (I tested and got a fair quality from around 10 meters) Helical antenna Alternatively, cheap helical antennas for 433Mhz are available for sale like the one shown below. The antenna is nothing else than a piece of wire of around 17cm in length.

It can be attached near the marking ‘ANT’. It is imperative to add an antenna to the modules. They are great for small data transmission over small distances. So one needs to take measures to verify successful message transmission, if that’s needed. May I point out that these devices provide no verification of receipt.

These modules provide simplex 1 way data transmission, in order to get a 2 way communication channel is by installing 2 pairs. They are ridiculously cheap, selling at $1 or less a pair!! Transmitter Receiver – 433mhz They come in pairs, a receiver and a transmitter. The simplest form of wireless transmission (I could find) is the 433Mhz ASK modules. The most practical and cool way of sharing data from 1 Arduino to another is by far using a radio transmitter and receiver. You can download our e-book ‘Learn Arduino’ from this link

Arduino virtual wire library