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Merge pull request #7245 from stefan-oskamp/development 

Support for I2C sensor DHT12
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Theo Arends 2019-12-20 15:23:19 +01:00 committed by GitHub
parent d7563831be e853cc65e5
commit ef8aae03d2
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1
I2CDEVICES.md
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@ -61,4 +61,5 @@ Index | Define | Driver | Device | Address(es) | Description
38 | USE_DISPLAY_ILI9488 | xdsp_08 | FT6236 | 0x38 | Touch panel controller
39 | USE_DISPLAY_RA8876 | xdsp_10 | FT5316 | 0x38 | Touch panel controller
40 | USE_TSL2591 | xsns_57 | TLS2591 | 0x29 | Light intensity sensor
41 | USE_DHT12 | xsns_58 | DHT12 | 0x5C | Temperature and humidity sensor

1
tasmota/my_user_config.h
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@ -418,6 +418,7 @@
// #define USE_PAJ7620 // [I2cDriver34] Enable PAJ7620 gesture sensor (I2C address 0x73) (+2.5k code)
// #define USE_PCF8574 // [I2cDriver2] Enable PCF8574 I/O Expander (I2C addresses 0x20 - 0x26 and 0x39 - 0x3F) (+1k9 code)
// #define USE_HIH6 // [I2cDriver36] Enable Honeywell HIH Humidity and Temperature sensor (I2C address 0x27) (+0k6)
// #define USE_DHT12 // [I2cDriver41] Enable DHT12 humidity and temperature sensor (I2C address 0x5C) (+0k7 code)
// #define USE_DISPLAY // Add I2C Display Support (+2k code)
#define USE_DISPLAY_MODES1TO5 // Enable display mode 1 to 5 in addition to mode 0

1
tasmota/tasmota_post.h
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@ -135,6 +135,7 @@ char* ToHex_P(const unsigned char * in, size_t insz, char * out, size_t outsz, c
#define USE_SGP30 // Add I2C code for SGP30 sensor (+1k1 code)
//#define USE_SI1145 // Add I2C code for SI1145/46/47 sensor (+1k code)
#define USE_LM75AD // Add I2C code for LM75AD sensor (+0k5 code)
#define USE_DHT12 // Add I2C code for DHT12 temperature and humidity sensor (+0k7 code)
//#define USE_APDS9960 // Add I2C code for APDS9960 Proximity Sensor. Disables SHT and VEML6070 (+4k7 code)
//#define USE_MCP230xx // Enable MCP23008/MCP23017 - Must define I2C Address in #define USE_MCP230xx_ADDR below - range 0x20 - 0x27 (+4k7 code)
// #define USE_MCP230xx_ADDR 0x20 // Enable MCP23008/MCP23017 I2C Address to use (Must be within range 0x20 through 0x27 - set according to your wired setup)

140
tasmota/xsns_58_dht12.ino Normal file
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@ -0,0 +1,140 @@
/*
xsns_58_dht12.ino - DHT12 I2C temperature and humidity sensor support for Tasmota
Copyright (C) 2019 Stefan Oskamp and Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_I2C
#ifdef USE_DHT12
/*********************************************************************************************\
* DHT12 - Temperature and Humidity
*
* I2C Address: 0x5C
\*********************************************************************************************/
#define XSNS_58 58
#define XI2C_41 41 // See I2CDEVICES.md
#define DHT12_ADDR (uint8_t) 0x5C
char dht12_name[] = "DHT12-0x00";
uint8_t dht12_count = 0;
float dht12_temperature = NAN;
float dht12_humidity = NAN;
bool Dht12Read(void)
{
Wire.beginTransmission(DHT12_ADDR);
Wire.write(0);
if (Wire.endTransmission() != 0) {
return false;
}
delay(50);
Wire.requestFrom(DHT12_ADDR, (uint8_t) 5);
delay(5);
uint8_t humidity = Wire.read();
uint8_t humidityTenth = Wire.read();
uint8_t temp = Wire.read();
uint8_t tempTenth = Wire.read();
uint8_t checksum = Wire.read();
dht12_humidity = (float) humidity + (float) humidityTenth/(float) 10.0;
dht12_temperature = (float) temp + (float) tempTenth/(float) 10.0;
return (!isnan(dht12_temperature) && !isnan(dht12_humidity));
}
void Dht12Detect(void)
{
if (Dht12Read()) {
snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, dht12_name, DHT12_ADDR);
AddLog(LOG_LEVEL_DEBUG);
snprintf_P(dht12_name, sizeof(dht12_name), PSTR("%s%c0x%02X"), "DHT12", IndexSeparator(), DHT12_ADDR);
dht12_count = 1;
}
}
void Dht12Show(bool json)
{
if (dht12_count > 0)
{
char temperature[33];
dtostrfd(dht12_temperature, Settings.flag2.temperature_resolution, temperature);
char humidity[33];
dtostrfd(dht12_humidity, Settings.flag2.humidity_resolution, humidity);
if (json)
{
ResponseAppend_P(JSON_SNS_TEMPHUM, dht12_name, temperature, humidity);
#ifdef USE_DOMOTICZ
if ((0 == tele_period))
{
DomoticzTempHumSensor(temperature, humidity);
}
#endif // USE_DOMOTICZ
#ifdef USE_KNX
if (0 == tele_period)
{
KnxSensor(KNX_TEMPERATURE, dht12_temperature);
KnxSensor(KNX_HUMIDITY, dht12_humidity);
}
#endif // USE_KNX
#ifdef USE_WEBSERVER
}
else
{
WSContentSend_PD(HTTP_SNS_TEMP, dht12_name, temperature, TempUnit());
WSContentSend_PD(HTTP_SNS_HUM, dht12_name, humidity);
#endif // USE_WEBSERVER
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns58(uint8_t function)
{
if (!I2cEnabled(XI2C_41)) { return false; }
bool result = false;
if (FUNC_INIT == function) {
Dht12Detect();
}
else if (dht12_count > 0) {
switch (function) {
case FUNC_EVERY_SECOND:
Dht12Read();
break;
case FUNC_JSON_APPEND:
Dht12Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
Dht12Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_DHT12
#endif // USE_I2C