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105 lines
3.0 KiB
105 lines
3.0 KiB
// -----------------------------------------------------------------------------
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// DHT Sensor
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// -----------------------------------------------------------------------------
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#pragma once
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#include "Arduino.h"
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#include "BaseSensor.h"
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#include <OneWire.h>
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#include <DallasTemperature.h>
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#define DS18B20_OK 0
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#define DS18B20_NOT_FOUND 1
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#define DS18B20_OUT_OF_RANGE 2
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#define DS18B20_CONVERSION_ERROR 3
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class DS18B20Sensor : public BaseSensor {
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public:
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DS18B20Sensor(unsigned char gpio, bool pull_up = false): BaseSensor() {
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_gpio = gpio;
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if (pull_up) pinMode(_gpio, INPUT_PULLUP);
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init();
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}
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// Pre-read hook (usually to populate registers with up-to-date data)
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void pre() {
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_device->requestTemperatures();
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// TODO: enable?
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/*
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while (!_device->isConversionComplete()) {
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delay(1);
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}
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*/
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}
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// Descriptive name of the sensor
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String name() {
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char buffer[20];
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snprintf(buffer, sizeof(buffer), "DS18B20 %s@ GPIO%d",
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_device->isParasitePowerMode() ? "(P) " : "",
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_gpio
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);
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return String(buffer);
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}
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// Descriptive name of the slot # index
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String slot(unsigned char index) {
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if (index < _count) {
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DeviceAddress address;
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_device->getAddress(address, index);
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char buffer[40];
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snprintf(buffer, sizeof(buffer), "%02X%02X%02X%02X%02X%02X%02X%02X @ %s",
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address[0], address[1], address[2], address[3],
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address[4], address[5], address[6], address[7],
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name().c_str()
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);
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return String(buffer);
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}
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_error = DS18B20_OUT_OF_RANGE;
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return String();
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}
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// Type for slot # index
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magnitude_t type(unsigned char index) {
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if (index < _count) return MAGNITUDE_TEMPERATURE;
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_error = DS18B20_OUT_OF_RANGE;
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return MAGNITUDE_NONE;
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}
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// Current value for slot # index
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double value(unsigned char index) {
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if (index < _count) {
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double t = _device->getTempCByIndex(index);
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if (t != DEVICE_DISCONNECTED_C) {
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_error = DS18B20_OK;
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return t;
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}
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_error = DS18B20_CONVERSION_ERROR;
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}
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_error = DS18B20_OUT_OF_RANGE;
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return 0;
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}
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protected:
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void init() {
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OneWire * wire = new OneWire(_gpio);
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_device = new DallasTemperature(wire);
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_device->begin();
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_device->setWaitForConversion(false);
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_count = _device->getDeviceCount();
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if (_count == 0) _error = DS18B20_NOT_FOUND;
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}
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unsigned char _gpio;
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DallasTemperature * _device;
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};
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