mirror of https://github.com/arendst/Tasmota.git
231 lines
7.4 KiB
C++
231 lines
7.4 KiB
C++
/*
|
|
xsns_63_AHT1x.ino - AHT10 I2C temperature and humidity sensor support for Tasmota
|
|
|
|
Copyright (C) 2021 Martin Wagner
|
|
|
|
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
|
|
#if defined(USE_AHT1x) || defined(USE_AHT2x) || defined(USE_AHT3x)
|
|
|
|
/*********************************************************************************************\
|
|
* AHT10/15/20 - Temperature and Humidity
|
|
*
|
|
* AHT1x I2C Address: 0x38, 0x39
|
|
* the driver supports two I2c adresses but only one Sensor allowed.
|
|
*
|
|
* Attention: the AHT10/15 Sensor is incompatible with other I2C devices on I2C bus.
|
|
*
|
|
* The Datasheet write:
|
|
* "Only a single AHT10 can be connected to the I2C bus and no other I2C
|
|
* devices can be connected".
|
|
*
|
|
* after lot of search and tests, now is confirmed that works only reliable with one sensor
|
|
* on I2C Bus
|
|
*
|
|
* 27.08.2020 support for AHT20 added. Now, the AHT20 should support standard I2C Protokoll
|
|
* and allows other I2C Devices on the bus but have only one I2C Address (0x38)
|
|
* 14.09.2021 support AHT20 without enabling AHT1x
|
|
*
|
|
* 26.10.2023 support for AHT30 added.
|
|
*
|
|
* AHT20 I2C Address: 0x38
|
|
* AHT30 I2C Address: 0x38
|
|
\*********************************************************************************************/
|
|
|
|
#define XSNS_63 63
|
|
#define XI2C_43 43 // See I2CDEVICES.md
|
|
|
|
#define AHT1X_ADDR1 0x38
|
|
#define AHT1X_ADDR2 0x39
|
|
|
|
#define AHT1X_MAX_SENSORS 2
|
|
|
|
#define AHT_HUMIDITY_CONST 100
|
|
#define AHT_TEMPERATURE_CONST 200
|
|
#define AHT_TEMPERATURE_OFFSET 50
|
|
#define KILOBYTE_CONST 1048576.0f
|
|
|
|
#define AHT1X_CMD_DELAY 20
|
|
#define AHT1X_RST_DELAY 10
|
|
#define AHT1X_MEAS_DELAY 80 // over 75ms in datasheet
|
|
|
|
#ifdef USE_AHT3x
|
|
#define AHTX_CMD 0xBE // Cmd for AHT3x
|
|
const char ahtTypes[] PROGMEM = "AHT3X|AHT3X";
|
|
#elif defined(USE_AHT2x)
|
|
#define AHTX_CMD 0xBE // Cmd for AHT2x
|
|
const char ahtTypes[] PROGMEM = "AHT2X|AHT2X";
|
|
#else
|
|
#define AHTX_CMD 0xE1 // Cmd for AHT1x
|
|
const char ahtTypes[] PROGMEM = "AHT1X|AHT1X";
|
|
#endif
|
|
|
|
uint8_t AHTSetCalCmd[3] = { AHTX_CMD, 0x08, 0x00 }; // load factory calibration coeff
|
|
uint8_t AHTSetCycleCmd[3] = { AHTX_CMD, 0x28, 0x00 }; // enable cycle mode
|
|
uint8_t AHTMeasureCmd[3] = { 0xAC, 0x33, 0x00 }; // start measurment command
|
|
uint8_t AHTResetCmd = 0xBA; // soft reset command
|
|
|
|
struct {
|
|
bool write_ok = false;
|
|
uint8_t addresses[2] = { AHT1X_ADDR1, AHT1X_ADDR2 };
|
|
uint8_t count = 0;
|
|
uint8_t Pcount = 0;
|
|
} aht1x;
|
|
|
|
struct {
|
|
float humidity = NAN;
|
|
float temperature = NAN;
|
|
uint8_t address; // bus address
|
|
char types[6]; // Sensor type name and address -
|
|
} aht1x_sensors[AHT1X_MAX_SENSORS];
|
|
|
|
bool AHT1XWrite(uint8_t aht1x_idx) {
|
|
TwoWire &wire = I2cGetWire();
|
|
wire.beginTransmission(aht1x_sensors[aht1x_idx].address);
|
|
wire.write(AHTMeasureCmd, 3);
|
|
if (wire.endTransmission() != 0)
|
|
return false;
|
|
delay(AHT1X_MEAS_DELAY);
|
|
return true;
|
|
}
|
|
|
|
bool AHT1XRead(uint8_t aht1x_idx) {
|
|
uint8_t data[6];
|
|
TwoWire &wire = I2cGetWire();
|
|
wire.requestFrom(aht1x_sensors[aht1x_idx].address, (uint8_t) 6);
|
|
|
|
for(uint8_t i = 0; wire.available() > 0; i++) {
|
|
data[i] = wire.read();
|
|
}
|
|
if (data[0] & 0x80)
|
|
return false; //device is busy
|
|
|
|
aht1x_sensors[aht1x_idx].humidity = (((data[1] << 12)| (data[2] << 4) | data[3] >> 4) * AHT_HUMIDITY_CONST / KILOBYTE_CONST);
|
|
aht1x_sensors[aht1x_idx].temperature = ((AHT_TEMPERATURE_CONST * (((data[3] & 0x0F) << 16) | (data[4] << 8) | data[5]) / KILOBYTE_CONST) - AHT_TEMPERATURE_OFFSET);
|
|
|
|
return (!isnan(aht1x_sensors[aht1x_idx].temperature) && !isnan(aht1x_sensors[aht1x_idx].humidity) && (aht1x_sensors[aht1x_idx].humidity != 0));
|
|
}
|
|
|
|
/********************************************************************************************/
|
|
|
|
// Polling the device without delays
|
|
// Incompatible with other devices on I2C bus
|
|
void AHT1XPoll(void) { // We have 100ms for read. Sensor needs 80-95 ms
|
|
aht1x.Pcount++;
|
|
switch (aht1x.Pcount) {
|
|
case 10:
|
|
aht1x.write_ok = AHT1XWrite(0);
|
|
break;
|
|
case 11:
|
|
if (aht1x.write_ok) AHT1XRead(0);
|
|
aht1x.Pcount = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
unsigned char AHT1XReadStatus(uint8_t aht1x_address) {
|
|
uint8_t result = 0;
|
|
// Need for AHT20?
|
|
//Wire.beginTransmission(aht1x_address);
|
|
//Wire.write(0x71);
|
|
//if (Wire.endTransmission() != 0) return false;
|
|
TwoWire &wire = I2cGetWire();
|
|
wire.requestFrom(aht1x_address, (uint8_t) 1);
|
|
result = wire.read();
|
|
return result;
|
|
}
|
|
|
|
void AHT1XReset(uint8_t aht1x_address) {
|
|
TwoWire &wire = I2cGetWire();
|
|
wire.beginTransmission(aht1x_address);
|
|
wire.write(AHTResetCmd);
|
|
wire.endTransmission();
|
|
delay(AHT1X_RST_DELAY);
|
|
}
|
|
|
|
/********************************************************************************************/
|
|
bool AHT1XInit(uint8_t aht1x_address) {
|
|
TwoWire &wire = I2cGetWire();
|
|
wire.beginTransmission(aht1x_address);
|
|
wire.write(AHTSetCalCmd, 3);
|
|
if (wire.endTransmission() != 0)
|
|
return false;
|
|
delay(AHT1X_CMD_DELAY);
|
|
if(AHT1XReadStatus(aht1x_address) & 0x08) // Sensor calibrated?
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
void AHT1XDetect(void) {
|
|
for (uint8_t i = 0; i < AHT1X_MAX_SENSORS; i++) {
|
|
if (!I2cSetDevice(aht1x.addresses[i])) {continue;}
|
|
if (AHT1XInit(aht1x.addresses[i])) {
|
|
aht1x_sensors[aht1x.count].address = aht1x.addresses[i];
|
|
GetTextIndexed(aht1x_sensors[aht1x.count].types, sizeof(aht1x_sensors[aht1x.count].types), i, ahtTypes);
|
|
I2cSetActiveFound(aht1x_sensors[aht1x.count].address, aht1x_sensors[aht1x.count].types);
|
|
aht1x.count++;
|
|
break; // Only one Sensor allowed at the moment (I2C Sensor-Bug)
|
|
}
|
|
}
|
|
}
|
|
|
|
void AHT1XShow(bool json) {
|
|
for (uint32_t i = 0; i < aht1x.count; i++) {
|
|
float tem = ConvertTemp(aht1x_sensors[i].temperature);
|
|
float hum = ConvertHumidity(aht1x_sensors[i].humidity);
|
|
char types[11]; // AHT1X-0x38
|
|
strlcpy(types, aht1x_sensors[i].types, sizeof(types));
|
|
if (aht1x.count > 1) {
|
|
snprintf_P(types, sizeof(types), PSTR("%s%c%02X"), aht1x_sensors[i].types, IndexSeparator(), aht1x_sensors[i].address); // "X-0xXX"
|
|
}
|
|
TempHumDewShow(json, ((0 == TasmotaGlobal.tele_period) && (0 == i)), types, tem, hum);
|
|
}
|
|
}
|
|
|
|
/*********************************************************************************************\
|
|
* Interface
|
|
\*********************************************************************************************/
|
|
|
|
bool Xsns63(uint32_t function)
|
|
{
|
|
if (!I2cEnabled(XI2C_43)) { return false; }
|
|
bool result = false;
|
|
|
|
if (FUNC_INIT == function) {
|
|
AHT1XDetect();
|
|
}
|
|
else if (aht1x.count) {
|
|
switch (function) {
|
|
case FUNC_EVERY_SECOND:
|
|
AHT1XPoll();
|
|
break;
|
|
case FUNC_JSON_APPEND:
|
|
AHT1XShow(1);
|
|
break;
|
|
#ifdef USE_WEBSERVER
|
|
case FUNC_WEB_SENSOR:
|
|
AHT1XShow(0);
|
|
break;
|
|
#endif // USE_WEBSERVER
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#endif // USE_AHT1X
|
|
#endif // USE_I2C
|