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Vw_send((uint8_t *)msg0, strlen(msg0)) // Sending the msgĭelay(5000) // Wait five seconds and it again Strcat(msg0, msg1) // Adding/joining the two arrays Itoa(tem, msg0, 10) // Converting the temperature to an array of chars Itoa(hum, msg1, 10) // Converting humidity to an array of chars Tem = dht.readTemperature() // Variable holding temperature Hum = dht.readHumidity() // Variable holding humidity Vw_set_tx_pin(9) // VirtualWire transmit pin Vw_setup(4800) // VirtualWire communication speed Follow the labels on the schematic to connect to the Arduino Mega. To send the humidity and the temperature in one single send statement, I join them together since this is one-way communication. First, the data is read into the variable as integers, then the integers are converted to an array of characters, and finally they are joined together. On the receiver side, the data will be split into single characters.