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Add support for LM75AD I2C Temperature Sensor
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/* | ||
xdrv_26_lm75ad.ino - Support for I2C LM75AD Temperature Sensor | ||
Copyright (C) 2018 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/>. | ||
*/ | ||
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#ifdef USE_I2C | ||
#ifdef USE_LM75AD | ||
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/*********************************************************************************************\ | ||
* LM75AD | ||
\*********************************************************************************************/ | ||
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#define LM75AD_ADDRESS1 0x48 | ||
#define LM75AD_ADDRESS2 0x49 | ||
#define LM75AD_ADDRESS3 0x4A | ||
#define LM75AD_ADDRESS4 0x4B | ||
#define LM75AD_ADDRESS5 0x4C | ||
#define LM75AD_ADDRESS6 0x4D | ||
#define LM75AD_ADDRESS7 0x4E | ||
#define LM75AD_ADDRESS8 0x4F | ||
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#define LM75_TEMP_REGISTER 0x00 | ||
#define LM75_CONF_REGISTER 0x01 | ||
#define LM75_THYST_REGISTER 0x02 | ||
#define LM75_TOS_REGISTER 0x03 | ||
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uint8_t lm75ad_type = 0; | ||
uint8_t lm75ad_address; | ||
uint8_t lm75ad_addresses[] = { LM75AD_ADDRESS1, LM75AD_ADDRESS2, LM75AD_ADDRESS3, LM75AD_ADDRESS4, LM75AD_ADDRESS5, LM75AD_ADDRESS6, LM75AD_ADDRESS7, LM75AD_ADDRESS8 }; | ||
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int16_t LM75ADGetTempRegister(void) | ||
{ | ||
uint16_t res = I2cRead16(lm75ad_address, LM75_TEMP_REGISTER); | ||
return (int16_t)res; | ||
} | ||
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void LM75ADDetect() | ||
{ | ||
uint8_t buffer; | ||
if (lm75ad_type) { | ||
return; | ||
} | ||
for (byte i = 0; i < sizeof(lm75ad_addresses); i++) { | ||
lm75ad_address = lm75ad_addresses[i]; | ||
if (I2cValidRead8(&buffer,lm75ad_address,LM75_CONF_REGISTER)) { | ||
lm75ad_type = 1; | ||
snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, "LM75AD", lm75ad_address); | ||
AddLog(LOG_LEVEL_DEBUG); | ||
break; | ||
} | ||
} | ||
} | ||
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float LM75ADConvertTemp(uint16_t t) { | ||
float tmpt; | ||
if (t & 0x8000) { // we are getting a negative temperature value | ||
t=t<<1; // shift out the MSB | ||
t=t>>6; // shift value into place (5 LSB not used + the MSB we shifted out to make it zero) | ||
tmpt=t*0.125*-1; | ||
} else { // we're getting a positive value | ||
t=t>>5; // shift value into place (5 LSB not used) | ||
tmpt=t*0.125; | ||
} | ||
if (!isnan(tmpt) && Settings.flag.temperature_conversion) { | ||
tmpt = tmpt * 1.8 + 32; // Fahrenheit | ||
} | ||
return tmpt; | ||
} | ||
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void LM75ADShow(boolean json) | ||
{ | ||
if (lm75ad_type) { | ||
char temperature[10]; | ||
uint16_t lm75ad_value = LM75ADGetTempRegister(); | ||
float t=LM75ADConvertTemp(lm75ad_value); | ||
dtostrfd(t, Settings.flag2.temperature_resolution, temperature); | ||
if (json) { | ||
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"LM75AD\":{\"" D_JSON_TEMPERATURE "\":%s}"), mqtt_data, temperature); | ||
#ifdef USE_WEBSERVER | ||
} else { | ||
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, "LM75AD", temperature, TempUnit()); | ||
#endif // USE_WEBSERVER | ||
} | ||
} | ||
} | ||
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/*********************************************************************************************\ | ||
* Interface | ||
\*********************************************************************************************/ | ||
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#define XSNS_26 | ||
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boolean Xsns26(byte function) | ||
{ | ||
boolean result = false; | ||
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if (i2c_flg) { | ||
switch (function) { | ||
case FUNC_PREP_BEFORE_TELEPERIOD: | ||
LM75ADDetect(); | ||
break; | ||
case FUNC_JSON_APPEND: | ||
LM75ADShow(1); | ||
break; | ||
#ifdef USE_WEBSERVER | ||
case FUNC_WEB_APPEND: | ||
LM75ADShow(0); | ||
break; | ||
#endif // USE_WEBSERVER | ||
} | ||
} | ||
return result; | ||
} | ||
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#endif // USE_LM75AD | ||
#endif // USE_I2C |