Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Wireless termometer.
#include <Arduino.h>
#include "nRF24L01.h"
#include "RF24.h"
int msg[2];
RF24 radio(9, 10);
const uint64_t pipe = 0xE8E8F0F0E1LL;
void setup(void) {
Serial.begin(9600);
radio.begin();
radio.openReadingPipe(1, pipe);
radio.startListening();
}
void loop(void) {
if (radio.available()) {
bool done = false;
while (!done) {
done = radio.read(msg, 4);
int Fract = msg[0] % 100;
Serial.print(msg[0] / 100);
Serial.print(".");
if (Fract < 10) Serial.print("0");
Serial.print(Fract);
Serial.print(" ");
Serial.println(msg[0]);
if (msg[0] == 111) {
delay(10);
}
delay(10);
}
}
else {
delay(100);
Serial.println("No radio available");
}
}
#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "OneWire.h"
OneWire ds(2);
int msg[2];
RF24 radio(9, 10);
const uint64_t pipe = 0xE8E8F0F0E1LL;
int SW1 = 7;
void setup(void) {
Serial.begin(9600);
radio.begin();
radio.openWritingPipe(pipe);
}
void loop(void) {
byte i;
byte present = 0;
byte data[12];
byte addr[8];
ds.reset_search();
if (!ds.search(addr)) {
Serial.print("No more addresses.\n");
ds.reset_search();
return;
}
Serial.print("R=");
for (i = 0; i < 8; i++) {
Serial.print(addr[i], HEX);
Serial.print(" ");
}
if (OneWire::crc8(addr, 7) != addr[7]) {
Serial.print("CRC is not valid!\n");
return;
}
if (addr[0] == 0x10) {
Serial.print("Device is a DS18S20 family device.\n");
}
else if (addr[0] == 0x28) {
Serial.print("Device is a DS18B20 family device.\n");
}
else {
Serial.print("Device family is not recognized: 0x");
Serial.println(addr[0], HEX);
return;
}
ds.reset();
ds.select(addr);
ds.write(0x44, 1); // start conversion, with parasite power on at the end
delay(1000); // maybe 750ms is enough, maybe not
// we might do a ds.depower() here, but the reset will take care of it.
present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad
Serial.print("P=");
Serial.print(present, HEX);
Serial.print(" ");
for (i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
Serial.print(data[i], HEX);
Serial.print(" ");
}
Serial.print(" CRC=");
Serial.print(OneWire::crc8(data, 8), HEX);
Serial.println();
int HighByte, LowByte, TReading, SignBit, Tc_100, Whole, Fract;
LowByte = data[0];
HighByte = data[1];
TReading = (HighByte << 8) + LowByte;
SignBit = TReading & 0x8000; // test most sig bit
if (SignBit) // negative
{
TReading = (TReading ^ 0xffff) + 1; // 2's comp
}
Tc_100 = (6 * TReading) + TReading / 4; // multiply by (100 * 0.0625) or 6.25
Whole = Tc_100 / 100; // separate off the whole and fractional portions
Fract = Tc_100 % 100;
if (SignBit) // If its negative
{
Serial.print("-");
}
Serial.print(Whole);
Serial.print(".");
if (Fract < 10)
{
Serial.print("0");
}
Serial.print(Fract);
msg[0] = Tc_100;
radio.write(msg, 4);
Serial.print("\n");
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment