Tasmota/tasmota/xsns_72_mcp9808.ino

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/*
xsns_72_mcp9808 - MCP9808 I2C temperature sensor support for Tasmota
Copyright (C) 2020 Martin Wagner 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_MCP9808
/*********************************************************************************************\
* MCP9808 - Temperature Sensor
*
* I2C Address: 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F
*
\*********************************************************************************************/
#define XSNS_72 72
#define XI2C_51 51 // See I2CDEVICES.md
#include "Adafruit_MCP9808.h"
Adafruit_MCP9808 mcp9808 = Adafruit_MCP9808(); // create object copy
#define MCP9808_MAX_SENSORS 8
#define MCP9808_START_ADDRESS 0x18
struct {
char types[9] = "MCP9808";
uint8_t count = 0;
} mcp9808_cfg;
struct {
float temperature = NAN;
uint8_t address;
} mcp9808_sensors[MCP9808_MAX_SENSORS];
/********************************************************************************************/
float MCP9808Read(uint8_t addr) {
float t = mcp9808.readTempC(addr);
return t;
}
void MCP9808Detect(void) {
for (uint8_t i = 0; i < MCP9808_MAX_SENSORS; i++) {
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if (!I2cSetDevice(MCP9808_START_ADDRESS + i)) { continue; }
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if (mcp9808.begin(MCP9808_START_ADDRESS + i)) {
mcp9808_sensors[mcp9808_cfg.count].address = MCP9808_START_ADDRESS + i;
I2cSetActiveFound(mcp9808_sensors[mcp9808_cfg.count].address, mcp9808_cfg.types);
mcp9808.setResolution (mcp9808_sensors[mcp9808_cfg.count].address, 2); // Set Resolution to 0.125°C
mcp9808_cfg.count++;
}
}
}
void MCP9808EverySecond(void) {
for (uint32_t i = 0; i < mcp9808_cfg.count; i++) {
float t = MCP9808Read(mcp9808_sensors[i].address);
mcp9808_sensors[i].temperature = ConvertTemp(t);
}
}
void MCP9808Show(bool json) {
for (uint32_t i = 0; i < mcp9808_cfg.count; i++) {
char temperature[33];
dtostrfd(mcp9808_sensors[i].temperature, Settings.flag2.temperature_resolution, temperature);
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char sensor_name[11];
strlcpy(sensor_name, mcp9808_cfg.types, sizeof(sensor_name));
if (mcp9808_cfg.count > 1) {
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snprintf_P(sensor_name, sizeof(sensor_name), PSTR("%s%c%02X"), sensor_name, IndexSeparator(), mcp9808_sensors[i].address); // MCP9808-18, MCP9808-1A etc.
}
if (json) {
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ResponseAppend_P(JSON_SNS_TEMP, sensor_name, temperature);
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if ((0 == TasmotaGlobal.tele_period) && (0 == i)) {
#ifdef USE_DOMOTICZ
DomoticzSensor(DZ_TEMP, temperature);
#endif // USE_DOMOTICZ
#ifdef USE_KNX
KnxSensor(KNX_TEMPERATURE, mcp9808_sensors[i].temperature);
#endif // USE_KNX
}
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_SNS_TEMP, sensor_name, temperature, TempUnit());
#endif // USE_WEBSERVER
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns72(uint8_t function)
{
if (!I2cEnabled(XI2C_51)) { return false; }
bool result = false;
if (FUNC_INIT == function) {
MCP9808Detect();
}
else if (mcp9808_cfg.count){
switch (function) {
case FUNC_EVERY_SECOND:
MCP9808EverySecond();
break;
case FUNC_JSON_APPEND:
MCP9808Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
MCP9808Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_MCP9808
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#endif // USE_I2C