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244 lines
6.9 KiB
244 lines
6.9 KiB
/*
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DHT 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 DHT_SUPPORT
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double _dhtTemperature = 0;
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unsigned int _dhtHumidity = 0;
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// -----------------------------------------------------------------------------
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// HAL
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// https://github.com/gosouth/DHT22/blob/master/main/DHT22.c
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// -----------------------------------------------------------------------------
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#define DHT_MAX_DATA 5
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#define DHT_MAX_ERRORS 5
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#define DHT_MIN_INTERVAL 2000
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#define DHT_OK 0
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#define DHT_CHECKSUM_ERROR -1
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#define DHT_TIMEOUT_ERROR -2
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#define DHT11 11
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#define DHT22 22
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#define DHT21 21
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#define AM2301 21
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unsigned long _getSignalLevel(unsigned char gpio, int usTimeOut, bool state) {
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unsigned long uSec = 1;
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while (digitalRead(gpio) == state) {
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if (++uSec > usTimeOut) return 0;
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delayMicroseconds(1);
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}
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return uSec;
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}
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int readDHT(unsigned char gpio, unsigned char type) {
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static unsigned long last_ok = 0;
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if (millis() - last_ok < DHT_MIN_INTERVAL) return DHT_OK;
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unsigned long low = 0;
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unsigned long high = 0;
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static unsigned char errors = 0;
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uint8_t dhtData[DHT_MAX_DATA] = {0};
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uint8_t byteInx = 0;
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uint8_t bitInx = 7;
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// Send start signal to DHT sensor
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if (++errors > DHT_MAX_ERRORS) {
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errors = 0;
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digitalWrite(gpio, HIGH);
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delay(250);
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}
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pinMode(gpio, OUTPUT);
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digitalWrite(gpio, LOW);
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delay(20);
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noInterrupts();
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digitalWrite(gpio, HIGH);
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delayMicroseconds(40);
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pinMode(gpio, INPUT_PULLUP);
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delayMicroseconds(10);
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// DHT will keep the line low for 80 us and then high for 80us
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low = _getSignalLevel(gpio, 85, LOW);
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if (low==0) return DHT_TIMEOUT_ERROR;
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high = _getSignalLevel(gpio, 85, HIGH);
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if (high==0) return DHT_TIMEOUT_ERROR;
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// No errors, read the 40 data bits
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for( int k = 0; k < 40; k++ ) {
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// Starts new data transmission with >50us low signal
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low = _getSignalLevel(gpio, 56, LOW);
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if (low==0) return DHT_TIMEOUT_ERROR;
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// Check to see if after >70us rx data is a 0 or a 1
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high = _getSignalLevel(gpio, 75, HIGH);
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if (high==0) return DHT_TIMEOUT_ERROR;
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// add the current read to the output data
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// since all dhtData array where set to 0 at the start,
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// only look for "1" (>28us us)
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if (high > low) dhtData[byteInx] |= (1 << bitInx);
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// index to next byte
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if (bitInx == 0) {
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bitInx = 7;
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++byteInx;
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} else {
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--bitInx;
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}
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}
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interrupts();
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// Verify checksum
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if (dhtData[4] != ((dhtData[0] + dhtData[1] + dhtData[2] + dhtData[3]) & 0xFF)) {
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return DHT_CHECKSUM_ERROR;
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}
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// Get humidity from Data[0] and Data[1]
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if (type == DHT11) {
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_dhtHumidity = dhtData[0];
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} else {
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_dhtHumidity = dhtData[0] * 256 + dhtData[1];
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_dhtHumidity /= 10;
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}
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// Get temp from Data[2] and Data[3]
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if (type == DHT11) {
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_dhtTemperature = dhtData[2];
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} else {
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_dhtTemperature = (dhtData[2] & 0x7F) * 256 + dhtData[3];
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_dhtTemperature /= 10;
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if (dhtData[2] & 0x80) _dhtTemperature *= -1;
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}
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last_ok = millis();
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errors = 0;
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return DHT_OK;
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}
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int readDHT() {
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return readDHT(DHT_PIN, DHT_TYPE);
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}
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// -----------------------------------------------------------------------------
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// Private
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// -----------------------------------------------------------------------------
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void _dhtWebSocketOnSend(JsonObject& root) {
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root["dhtVisible"] = 1;
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root["dhtTmp"] = getDHTTemperature();
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root["dhtHum"] = getDHTHumidity();
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}
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// -----------------------------------------------------------------------------
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// Values
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// -----------------------------------------------------------------------------
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double getDHTTemperature(bool celsius) {
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double value = celsius ? _dhtTemperature : _dhtTemperature * 1.8 + 32;
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return roundTo(value, DHT_TEMPERATURE_DECIMALS);
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}
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double getDHTTemperature() {
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return getDHTTemperature(true);
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}
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unsigned int getDHTHumidity() {
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return _dhtHumidity;
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}
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void dhtSetup() {
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#if WEB_SUPPORT
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// Websockets
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wsOnSendRegister(_dhtWebSocketOnSend);
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apiRegister(DHT_TEMPERATURE_TOPIC, DHT_TEMPERATURE_TOPIC, [](char * buffer, size_t len) {
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dtostrf(_dhtTemperature, 1-len, 1, buffer);
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});
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apiRegister(DHT_HUMIDITY_TOPIC, DHT_HUMIDITY_TOPIC, [](char * buffer, size_t len) {
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snprintf_P(buffer, len, PSTR("%d"), _dhtHumidity);
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});
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#endif
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}
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void dhtLoop() {
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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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if ((millis() - last_update > DHT_UPDATE_INTERVAL) || (last_update == 0)) {
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last_update = millis();
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// Read sensor data
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if (readDHT(DHT_PIN, DHT_TYPE) == DHT_OK) {
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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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double t = getDHTTemperature(tmpUnits == TMP_CELSIUS) + tmpCorrection;
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unsigned int h = getDHTHumidity();
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char temperature[6];
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char humidity[6];
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dtostrf(t, 1-sizeof(temperature), 1, temperature);
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itoa((unsigned int) h, humidity, 10);
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DEBUG_MSG_P(PSTR("[DHT] Temperature: %s%s\n"), temperature, (tmpUnits == TMP_CELSIUS) ? "ºC" : "ºF");
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DEBUG_MSG_P(PSTR("[DHT] Humidity: %s\n"), humidity);
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// Send MQTT messages
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mqttSend(getSetting("dhtTmpTopic", DHT_TEMPERATURE_TOPIC).c_str(), temperature);
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mqttSend(getSetting("dhtHumTopic", DHT_HUMIDITY_TOPIC).c_str(), humidity);
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// Send to Domoticz
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#if DOMOTICZ_SUPPORT
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{
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domoticzSend("dczTmpIdx", 0, temperature);
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int status;
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if (h > 70) {
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status = HUMIDITY_WET;
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} else if (h > 45) {
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status = HUMIDITY_COMFORTABLE;
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} else if (h > 30) {
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status = HUMIDITY_NORMAL;
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} else {
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status = HUMIDITY_DRY;
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}
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char buffer[2];
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snprintf_P(buffer, sizeof(buffer), PSTR("%d"), status);
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domoticzSend("dczHumIdx", humidity, buffer);
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}
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#endif
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#if INFLUXDB_SUPPORT
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idbSend(getSetting("dhtTmpTopic", DHT_TEMPERATURE_TOPIC).c_str(), temperature);
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idbSend(getSetting("dhtHumTopic", DHT_HUMIDITY_TOPIC).c_str(), humidity);
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#endif
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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("{\"dhtVisible\": 1, \"dhtTmp\": %s, \"dhtHum\": %s, \"tmpUnits\": %d}"), temperature, humidity, 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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