I would like to introduce you to one of my interesting projects. It is a wireless thermometer that measures the indoor and outdoor temperature. The device consists of two parts. One is a transmitter that contains one digital temperature sensor and a transmitter module. A second receiver consisting of an LCD screen, the analog sensor and receiving module.
Step 1: Parts
You need:
1. Two arduinos any version
2. DS18B20 digital temperature sensor
3. LM35 analog temperature sebsor
4. LCD 16×2
5: RF 433MHz or 315 MHz module
Step 2: Transmitter
Transmitter is very simple. Connect the wires as shown in pictures.
Here is transmitter code:
#include <VirtualWire.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 7
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
char msg[6];
void setup() {
sensors.begin();
vw_setup(2000);
vw_set_tx_pin(3);
}
void loop() {
sensors.requestTemperatures();
float temperature = sensors.getTempCByIndex(0);
dtostrf(temperature, 6, 2, msg);
vw_send((uint8_t *)msg, strlen(msg));
vw_wait_tx();
delay(200);
For more detail: Indoor/outdoor wireless thermometer using Arduino
