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139 lines
3.8 KiB
139 lines
3.8 KiB
/*
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DS18B20 MODULE
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Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>
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*/
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#if DS18B20_SUPPORT
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#include <OneWire.h>
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#include <DallasTemperature.h>
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OneWire oneWire(DS18B20_PIN);
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DallasTemperature ds18b20(&oneWire);
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bool _dsIsConnected = false;
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double _dsTemperature = 0;
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char _dsTemperatureStr[6];
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// -----------------------------------------------------------------------------
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// DS18B20
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// -----------------------------------------------------------------------------
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double getDSTemperature() {
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return _dsTemperature;
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}
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const char* getDSTemperatureStr() {
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if (!_dsIsConnected)
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return "NOT CONNECTED";
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return _dsTemperatureStr;
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}
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void dsSetup() {
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ds18b20.begin();
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ds18b20.setWaitForConversion(false);
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#if WEB_SUPPORT
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apiRegister(DS18B20_TEMPERATURE_TOPIC, DS18B20_TEMPERATURE_TOPIC, [](char * buffer, size_t len) {
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dtostrf(_dsTemperature, 1-len, 1, buffer);
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});
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#endif
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}
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void dsLoop() {
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// Check if we should read new data
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static unsigned long last_update = 0;
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static bool requested = false;
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static double last_temperature = 0.0;
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bool send_update = false;
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if ((millis() - last_update > DS18B20_UPDATE_INTERVAL) || (last_update == 0)) {
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if (!requested) {
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ds18b20.requestTemperatures();
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requested = true;
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/* Requesting takes time,
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* so data will probably not be available in this round */
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return;
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}
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/* Check if requested data is already available */
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if (!ds18b20.isConversionComplete()) {
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return;
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}
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requested = false;
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last_update = millis();
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unsigned char tmpUnits = getSetting("tmpUnits", TMP_UNITS).toInt();
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double tmpCorrection = getSetting("tmpCorrection", TMP_CORRECTION).toFloat();
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// Read sensor data
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double t = (tmpUnits == TMP_CELSIUS) ? ds18b20.getTempCByIndex(0) : ds18b20.getTempFByIndex(0);
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// apply temperature reading correction
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t = t + tmpCorrection;
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// Check if readings are valid
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if (isnan(t) || t < -50) {
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DEBUG_MSG_P(PSTR("[DS18B20] Error reading sensor\n"));
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} else {
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//If the new temperature is different from the last
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if (fabs(t - last_temperature) >= DS18B20_UPDATE_ON_CHANGE) {
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last_temperature = t;
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send_update = true;
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}
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_dsTemperature = t;
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if ((tmpUnits == TMP_CELSIUS && _dsTemperature == DEVICE_DISCONNECTED_C) ||
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(tmpUnits == TMP_FAHRENHEIT && _dsTemperature == DEVICE_DISCONNECTED_F))
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_dsIsConnected = false;
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else
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_dsIsConnected = true;
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dtostrf(t, 1-sizeof(_dsTemperatureStr), 1, _dsTemperatureStr);
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DEBUG_MSG_P(PSTR("[DS18B20] Temperature: %s%s\n"),
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getDSTemperatureStr(),
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(_dsIsConnected ? ((tmpUnits == TMP_CELSIUS) ? "ºC" : "ºF") : ""));
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if (send_update) {
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// Send MQTT messages
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mqttSend(getSetting("dsTmpTopic", DS18B20_TEMPERATURE_TOPIC).c_str(), _dsTemperatureStr);
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// Send to Domoticz
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#if DOMOTICZ_SUPPORT
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domoticzSend("dczTmpIdx", 0, _dsTemperatureStr);
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#endif
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#if INFLUXDB_SUPPORT
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influxDBSend(getSetting("dsTmpTopic", DS18B20_TEMPERATURE_TOPIC).c_str(), _dsTemperatureStr);
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#endif
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}
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// Update websocket clients
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#if WEB_SUPPORT
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char buffer[100];
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snprintf_P(buffer, sizeof(buffer), PSTR("{\"dsVisible\": 1, \"dsTmp\": %s, \"tmpUnits\": %d}"), getDSTemperatureStr(), tmpUnits);
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wsSend(buffer);
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#endif
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}
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}
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}
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#endif
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