Fork of the espurna firmware for `mhsw` switches
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/*
DS18B20 MODULE
Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>
*/
#if ENABLE_DS18B20
#include <OneWire.h>
#include <DallasTemperature.h>
OneWire oneWire(DS_PIN);
DallasTemperature ds18b20(&oneWire);
bool _dsIsConnected = false;
double _dsTemperature = 0;
char _dsTemperatureStr[6];
// -----------------------------------------------------------------------------
// DS18B20
// -----------------------------------------------------------------------------
double getDSTemperature() {
return _dsTemperature;
}
const char* getDSTemperatureStr() {
if (!_dsIsConnected)
return "NOT CONNECTED";
return _dsTemperatureStr;
}
void dsSetup() {
ds18b20.begin();
ds18b20.setWaitForConversion(false);
apiRegister("/api/temperature", "temperature", [](char * buffer, size_t len) {
dtostrf(_dsTemperature, len-1, 1, buffer);
});
}
void dsLoop() {
// Check if we should read new data
static unsigned long last_update = 0;
static bool requested = false;
if ((millis() - last_update > DS_UPDATE_INTERVAL) || (last_update == 0)) {
if (!requested) {
ds18b20.requestTemperatures();
requested = true;
/* Requesting takes time,
* so data will probably not be available in this round */
return;
}
/* Check if requested data is already available */
if (!ds18b20.isConversionComplete()) {
return;
}
requested = false;
last_update = millis();
unsigned char tmpUnits = getSetting("tmpUnits", TMP_UNITS).toInt();
// Read sensor data
double t = (tmpUnits == TMP_CELSIUS) ? ds18b20.getTempCByIndex(0) : ds18b20.getTempFByIndex(0);
// Check if readings are valid
if (isnan(t)) {
DEBUG_MSG_P(PSTR("[DS18B20] Error reading sensor\n"));
} else {
_dsTemperature = t;
if ((tmpUnits == TMP_CELSIUS && _dsTemperature == DEVICE_DISCONNECTED_C) ||
(tmpUnits == TMP_FAHRENHEIT && _dsTemperature == DEVICE_DISCONNECTED_F))
_dsIsConnected = false;
else
_dsIsConnected = true;
dtostrf(t, 5, 1, _dsTemperatureStr);
DEBUG_MSG_P(PSTR("[DS18B20] Temperature: %s%s\n"),
getDSTemperatureStr(),
(_dsIsConnected ? ((tmpUnits == TMP_CELSIUS) ? "ºC" : "ºF") : ""));
// Send MQTT messages
mqttSend(getSetting("dsTmpTopic", DS_TEMPERATURE_TOPIC).c_str(), _dsTemperatureStr);
// Send to Domoticz
#if ENABLE_DOMOTICZ
domoticzSend("dczTmpIdx", 0, _dsTemperatureStr);
#endif
// Update websocket clients
char buffer[100];
sprintf_P(buffer, PSTR("{\"dsVisible\": 1, \"dsTmp\": %s, \"tmpUnits\": %d}"), getDSTemperatureStr(), tmpUnits);
wsSend(buffer);
}
}
}
#endif