mirror of https://github.com/arendst/Tasmota.git
266 lines
7.0 KiB
C++
266 lines
7.0 KiB
C++
/*
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xsns_dht.ino - DHTxx and AM23xx temperature and humidity sensor support for Sonoff-Tasmota
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Copyright (C) 2017 Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 DHT_MAX_SENSORS 3
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#define MIN_INTERVAL 2000
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uint32_t dht_maxcycles;
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uint8_t dht_data[5];
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byte dht_sensors = 0;
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struct DHTSTRUCT {
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byte pin;
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byte type;
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char stype[10];
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uint32_t lastreadtime;
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uint16_t lastresult;
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float t;
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float h = 0;
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} dht[DHT_MAX_SENSORS];
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void dht_readPrep()
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{
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for (byte i = 0; i < dht_sensors; i++) {
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digitalWrite(dht[i].pin, HIGH);
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}
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}
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uint32_t dht_expectPulse(byte sensor, bool level)
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{
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uint32_t count = 0;
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while (digitalRead(dht[sensor].pin) == level) {
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if (count++ >= dht_maxcycles) {
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return 0;
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}
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}
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return count;
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}
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void dht_read(byte sensor)
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{
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uint32_t cycles[80];
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uint32_t currenttime = millis();
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if ((currenttime - dht[sensor].lastreadtime) < 2000) {
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return;
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}
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dht[sensor].lastreadtime = currenttime;
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dht_data[0] = dht_data[1] = dht_data[2] = dht_data[3] = dht_data[4] = 0;
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// digitalWrite(dht[sensor].pin, HIGH);
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// delay(250);
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pinMode(dht[sensor].pin, OUTPUT);
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digitalWrite(dht[sensor].pin, LOW);
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delay(20);
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noInterrupts();
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digitalWrite(dht[sensor].pin, HIGH);
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delayMicroseconds(40);
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pinMode(dht[sensor].pin, INPUT_PULLUP);
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delayMicroseconds(10);
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if (0 == dht_expectPulse(sensor, LOW)) {
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addLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " " D_START_SIGNAL_LOW " " D_PULSE));
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dht[sensor].lastresult++;
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return;
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}
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if (0 == dht_expectPulse(sensor, HIGH)) {
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addLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " " D_START_SIGNAL_HIGH " " D_PULSE));
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dht[sensor].lastresult++;
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return;
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}
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for (int i = 0; i < 80; i += 2) {
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cycles[i] = dht_expectPulse(sensor, LOW);
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cycles[i+1] = dht_expectPulse(sensor, 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 ((0 == lowCycles) || (0 == highCycles)) {
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addLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_TIMEOUT_WAITING_FOR " " D_PULSE));
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dht[sensor].lastresult++;
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return;
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}
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dht_data[i/8] <<= 1;
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if (highCycles > lowCycles) {
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dht_data[i/8] |= 1;
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}
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}
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snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_DHT D_RECEIVED " %02X, %02X, %02X, %02X, %02X =? %02X"),
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dht_data[0], dht_data[1], dht_data[2], dht_data[3], dht_data[4], (dht_data[0] + dht_data[1] + dht_data[2] + dht_data[3]) & 0xFF);
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addLog(LOG_LEVEL_DEBUG);
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if (dht_data[4] == ((dht_data[0] + dht_data[1] + dht_data[2] + dht_data[3]) & 0xFF)) {
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dht[sensor].lastresult = 0;
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} else {
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addLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DHT D_CHECKSUM_FAILURE));
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dht[sensor].lastresult++;
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}
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}
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boolean dht_readTempHum(byte sensor, float &t, float &h)
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{
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if (!dht[sensor].h) {
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t = NAN;
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h = NAN;
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} else {
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if (dht[sensor].lastresult > 8) { // Reset after 8 misses
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dht[sensor].t = NAN;
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dht[sensor].h = NAN;
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}
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t = dht[sensor].t;
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h = dht[sensor].h;
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}
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dht_read(sensor);
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if (!dht[sensor].lastresult) {
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switch (dht[sensor].type) {
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case GPIO_DHT11:
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h = dht_data[0];
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t = convertTemp(dht_data[2]);
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break;
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case GPIO_DHT22:
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case GPIO_DHT21:
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h = dht_data[0];
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h *= 256;
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h += dht_data[1];
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h *= 0.1;
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t = dht_data[2] & 0x7F;
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t *= 256;
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t += dht_data[3];
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t *= 0.1;
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if (dht_data[2] & 0x80) {
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t *= -1;
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}
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t = convertTemp(t);
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break;
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}
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if (!isnan(t)) {
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dht[sensor].t = t;
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}
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if (!isnan(h)) {
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dht[sensor].h = h;
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}
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}
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return (!isnan(t) && !isnan(h));
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}
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boolean dht_setup(byte pin, byte type)
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{
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boolean success = false;
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if (dht_sensors < DHT_MAX_SENSORS) {
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dht[dht_sensors].pin = pin;
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dht[dht_sensors].type = type;
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dht_sensors++;
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success = true;
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}
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return success;
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}
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void dht_init()
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{
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dht_maxcycles = microsecondsToClockCycles(1000); // 1 millisecond timeout for reading pulses from DHT sensor.
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for (byte i = 0; i < dht_sensors; i++) {
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pinMode(dht[i].pin, INPUT_PULLUP);
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dht[i].lastreadtime = 0;
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dht[i].lastresult = 0;
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switch (dht[i].type) {
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case GPIO_DHT11:
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strcpy_P(dht[i].stype, PSTR("DHT11"));
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break;
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case GPIO_DHT21:
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strcpy_P(dht[i].stype, PSTR("AM2301"));
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break;
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case GPIO_DHT22:
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strcpy_P(dht[i].stype, PSTR("DHT22"));
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}
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if (dht_sensors > 1) {
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snprintf_P(dht[i].stype, sizeof(dht[i].stype), PSTR("%s-%02d"), dht[i].stype, dht[i].pin);
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}
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}
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}
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/*********************************************************************************************\
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* Presentation
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\*********************************************************************************************/
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void dht_mqttPresent(uint8_t* djson)
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{
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char stemp1[10];
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char stemp2[10];
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float t;
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float h;
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byte dsxflg = 0;
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for (byte i = 0; i < dht_sensors; i++) {
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if (dht_readTempHum(i, t, h)) { // Read temperature
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dtostrfd(t, sysCfg.flag.temperature_resolution, stemp1);
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dtostrfd(h, sysCfg.flag.humidity_resolution, stemp2);
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snprintf_P(mqtt_data, sizeof(mqtt_data), JSON_SNS_TEMPHUM, mqtt_data, dht[i].stype, stemp1, stemp2);
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*djson = 1;
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#ifdef USE_DOMOTICZ
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if (!dsxflg) {
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domoticz_sensor2(stemp1, stemp2);
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dsxflg++;
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}
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#endif // USE_DOMOTICZ
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}
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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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String page = "";
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char stemp[10];
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char sensor[80];
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float t;
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float h;
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for (byte i = 0; i < dht_sensors; i++) {
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if (dht_readTempHum(i, t, h)) {
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dtostrfi(t, sysCfg.flag.temperature_resolution, stemp);
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snprintf_P(sensor, sizeof(sensor), HTTP_SNS_TEMP, dht[i].stype, stemp, tempUnit());
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page += sensor;
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dtostrfi(h, sysCfg.flag.humidity_resolution, stemp);
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snprintf_P(sensor, sizeof(sensor), HTTP_SNS_HUM, dht[i].stype, stemp);
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page += sensor;
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}
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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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