Для измерения температуры мы выбрали стандартный ds18b20 от Dallas.
Это точный, недорогой, и вы можете подключать несколько датчиков параллельно, без использования дополнительного цифрового входа на плате Arduino.
Они бывают нескольких видов: чип, зонд, монолитный и водонепроницаемый.
Вам также понадобится небольшой резистор на 4,7 кОм.
Подключение
Начните с подключения радио
Датчик | Arduino | Комментарий |
---|---|---|
GND (левая нога) | GND | Черный |
VCC (правая нога) | VCC (3.0-5.5V) | Красный |
DQ (средняя нога) | D3 (цифровой вход) | Зеленый |
Установите 4.7kOhm (4k7) резистор между VCC and D 3(цифровой вход)
Пример
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/** * The MySensors Arduino library handles the wireless radio link and protocol * between your home built sensors/actuators and HA controller of choice. * The sensors forms a self healing radio network with optional repeaters. Each * repeater and gateway builds a routing tables in EEPROM which keeps track of the * network topology allowing messages to be routed to nodes. * * Created by Henrik Ekblad <henrik.ekblad@mysensors.org> * Copyright (C) 2013-2015 Sensnology AB * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors * * Documentation: http://www.mysensors.org * Support Forum: http://forum.mysensors.org * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * ******************************* * * DESCRIPTION * * Example sketch showing how to send in DS1820B OneWire temperature readings back to the controller * http://www.mysensors.org/build/temp */ // Enable debug prints to serial monitor //#define MY_DEBUG // Enable and select radio type attached #define MY_RADIO_RF24 //#define MY_RADIO_RFM69 #include <MySensors.h> #include <DallasTemperature.h> #include <OneWire.h> #define COMPARE_TEMP 1 // Send temperature only if changed? 1 = Yes 0 = No #define ONE_WIRE_BUS 3 // Pin where dallase sensor is connected #define MAX_ATTACHED_DS18B20 16 unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in milliseconds) OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs) DallasTemperature sensors(&oneWire); // Pass the oneWire reference to Dallas Temperature. float lastTemperature[MAX_ATTACHED_DS18B20]; int numSensors=0; bool receivedConfig = false; bool metric = true; // Initialize temperature message MyMessage msg(0,V_TEMP); void before() { // Startup up the OneWire library sensors.begin(); } void setup() { // requestTemperatures() will not block current thread sensors.setWaitForConversion(false); } void presentation() { // Send the sketch version information to the gateway and Controller sendSketchInfo("Temperature Sensor", "1.1"); // Fetch the number of attached temperature sensors numSensors = sensors.getDeviceCount(); // Present all sensors to controller for (int i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) { present(i, S_TEMP); } } void loop() { // Fetch temperatures from Dallas sensors sensors.requestTemperatures(); // query conversion time and sleep until conversion completed int16_t conversionTime = sensors.millisToWaitForConversion(sensors.getResolution()); // sleep() call can be replaced by wait() call if node need to process incoming messages (or if node is repeater) sleep(conversionTime); // Read temperatures and send them to controller for (int i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) { // Fetch and round temperature to one decimal float temperature = static_cast<float>(static_cast<int>((getControllerConfig().isMetric?sensors.getTempCByIndex(i):sensors.getTempFByIndex(i)) * 10.)) / 10.; // Only send data if temperature has changed and no error #if COMPARE_TEMP == 1 if (lastTemperature[i] != temperature && temperature != -127.00 && temperature != 85.00) { #else if (temperature != -127.00 && temperature != 85.00) { #endif // Send in the new temperature send(msg.setSensor(i).set(temperature,1)); // Save new temperatures for next compare lastTemperature[i]=temperature; } } sleep(SLEEP_TIME); } |
Документация
Перевёл Антон Вотчицев