mirror of https://github.com/arendst/Tasmota.git
215 lines
6.4 KiB
C++
215 lines
6.4 KiB
C++
/*
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Copyright (c) 2017 Theo Arends. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef USE_DHT
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/*********************************************************************************************\
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* DHT11, DHT21 (AM2301), DHT22 (AM2302, AM2321) - Temperature and Humidy
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*
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* Reading temperature or humidity takes about 250 milliseconds!
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* Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
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* Source: Adafruit Industries https://github.com/adafruit/DHT-sensor-library
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\*********************************************************************************************/
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#define MIN_INTERVAL 2000
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uint8_t data[5];
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uint32_t _lastreadtime, _maxcycles;
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bool _lastresult;
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float mt, mh = 0;
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void dht_readPrep()
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{
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digitalWrite(pin[GPIO_DHT11], HIGH);
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}
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uint32_t dht_expectPulse(bool level)
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{
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uint32_t count = 0;
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while (digitalRead(pin[GPIO_DHT11]) == level)
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if (count++ >= _maxcycles) return 0;
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return count;
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}
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boolean dht_read()
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{
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char log[LOGSZ];
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uint32_t cycles[80];
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uint32_t currenttime = millis();
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if ((currenttime - _lastreadtime) < 2000) {
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return _lastresult;
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}
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_lastreadtime = currenttime;
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data[0] = data[1] = data[2] = data[3] = data[4] = 0;
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// digitalWrite(pin[GPIO_DHT11], HIGH);
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// delay(250);
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pinMode(pin[GPIO_DHT11], OUTPUT);
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digitalWrite(pin[GPIO_DHT11], LOW);
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delay(20);
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noInterrupts();
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digitalWrite(pin[GPIO_DHT11], HIGH);
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delayMicroseconds(40);
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pinMode(pin[GPIO_DHT11], INPUT_PULLUP);
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delayMicroseconds(10);
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if (dht_expectPulse(LOW) == 0) {
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addLog_P(LOG_LEVEL_DEBUG, PSTR("DHT: Timeout waiting for start signal low pulse"));
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_lastresult = false;
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return _lastresult;
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}
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if (dht_expectPulse(HIGH) == 0) {
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addLog_P(LOG_LEVEL_DEBUG, PSTR("DHT: Timeout waiting for start signal high pulse"));
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_lastresult = false;
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return _lastresult;
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}
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for (int i=0; i<80; i+=2) {
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cycles[i] = dht_expectPulse(LOW);
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cycles[i+1] = dht_expectPulse(HIGH);
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}
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interrupts();
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for (int i=0; i<40; ++i) {
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uint32_t lowCycles = cycles[2*i];
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uint32_t highCycles = cycles[2*i+1];
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if ((lowCycles == 0) || (highCycles == 0)) {
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addLog_P(LOG_LEVEL_DEBUG, PSTR("DHT: Timeout waiting for pulse"));
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_lastresult = false;
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return _lastresult;
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}
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data[i/8] <<= 1;
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if (highCycles > lowCycles) data[i/8] |= 1;
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}
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snprintf_P(log, sizeof(log), PSTR("DHT: Received %02X, %02X, %02X, %02X, %02X =? %02X"),
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data[0], data[1], data[2], data[3], data[4], (data[0] + data[1] + data[2] + data[3]) & 0xFF);
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addLog(LOG_LEVEL_DEBUG, log);
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if (data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)) {
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_lastresult = true;
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return _lastresult;
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} else {
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addLog_P(LOG_LEVEL_DEBUG, PSTR("DHT: Checksum failure"));
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_lastresult = false;
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return _lastresult;
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}
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}
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float dht_convertCtoF(float c)
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{
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return c * 1.8 + 32;
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}
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boolean dht_readTempHum(bool S, float &t, float &h)
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{
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if (!mh) {
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t = NAN;
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h = NAN;
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} else {
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t = mt;
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h = mh;
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}
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if (dht_read()) {
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switch (dht_type) {
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case DHT11:
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h = data[0];
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t = data[2];
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if(S) t = dht_convertCtoF(t);
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break;
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case DHT22:
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case DHT21:
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h = data[0];
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h *= 256;
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h += data[1];
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h *= 0.1;
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t = data[2] & 0x7F;
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t *= 256;
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t += data[3];
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t *= 0.1;
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if (data[2] & 0x80) t *= -1;
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if(S) t = dht_convertCtoF(t);
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break;
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}
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if (!isnan(t)) mt = t;
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if (!isnan(h)) mh = h;
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}
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return (!isnan(t) && !isnan(h));
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}
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void dht_init()
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{
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char log[LOGSZ];
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_maxcycles = microsecondsToClockCycles(1000); // 1 millisecond timeout for
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// reading pulses from DHT sensor.
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pinMode(pin[GPIO_DHT11], INPUT_PULLUP);
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_lastreadtime = -MIN_INTERVAL;
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snprintf_P(log, sizeof(log), PSTR("DHT: Max clock cycles %d"), _maxcycles);
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addLog(LOG_LEVEL_DEBUG, log);
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}
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/*********************************************************************************************\
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* Presentation
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\*********************************************************************************************/
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void dht_mqttPresent(char* svalue, uint16_t ssvalue, uint8_t* djson)
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{
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char stemp1[10], stemp2[10];
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float t, h;
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if (dht_readTempHum(TEMP_CONVERSION, t, h)) { // Read temperature
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dtostrf(t, 1, TEMP_RESOLUTION &3, stemp1);
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dtostrf(h, 1, HUMIDITY_RESOLUTION &3, stemp2);
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snprintf_P(svalue, ssvalue, PSTR("%s, \"DHT\":{\"Temperature\":\"%s\", \"Humidity\":\"%s\"}"), svalue, stemp1, stemp2);
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*djson = 1;
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#ifdef USE_DOMOTICZ
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domoticz_sensor2(stemp1, stemp2);
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#endif // USE_DOMOTICZ
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}
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}
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#ifdef USE_WEBSERVER
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String dht_webPresent()
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{
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char stemp[10], sconv[10];
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float t, h;
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String page = "";
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if (dht_readTempHum(TEMP_CONVERSION, t, h)) { // Read temperature as Celsius (the default)
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snprintf_P(sconv, sizeof(sconv), PSTR("°%c"), (TEMP_CONVERSION) ? 'F' : 'C');
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dtostrf(t, 1, TEMP_RESOLUTION &3, stemp);
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page += F("<tr><td>DHT Temperature: </td><td>"); page += stemp; page += sconv; page += F("</td></tr>");
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dtostrf(h, 1, HUMIDITY_RESOLUTION &3, stemp);
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page += F("<tr><td>DHT Humidity: </td><td>"); page += stemp; page += F("%</td></tr>");
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}
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return page;
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}
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#endif // USE_WEBSERVER
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#endif // USE_DHT
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