/* xsns_41_max44009.ino - MAX44009 ambient light sensor support for Sonoff-Tasmota Copyright (C) 2019 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 . */ #ifdef USE_I2C #ifdef USE_MAX44009 /*********************************************************************************************\ * MAX44009 - Ambient Light Intensity * * I2C Address: 0x4a or 0x4b \*********************************************************************************************/ #define XSNS_41 41 #define MAX44009_ADDR1 0x4A #define MAX44009_ADDR2 0x4B #define MAX44009_NO_REGISTERS 8 #define REG_CONFIG 0x02 #define REG_LUMINANCE 0x03 #define REG_LOWER_THRESHOLD 0x06 #define REG_THRESHOLD_TIMER 0x07 #define MAX44009_CONTINUOUS_AUTO_MODE 0x80 // Start measurement in automatic, continous mode uint8_t max44009_address; uint8_t max44009_addresses[] = { MAX44009_ADDR1, MAX44009_ADDR2, 0 }; //0 terminated list uint8_t max44009_found = 0; uint8_t max44009_valid = 0; float max44009_illuminance = 0; char max44009_types[] = "MAX44009"; bool Max4409Read_lum(void) { max44009_valid = 0; uint8_t regdata[2]; /* Read 2 bytes luminance */ if (I2cValidRead16((uint16_t *)®data, max44009_address, REG_LUMINANCE)) { int exponent = (regdata[0] & 0xF0) >> 4; int mantissa = ((regdata[0] & 0x0F) << 4) | (regdata[1] & 0x0F); max44009_illuminance = (float)(((0x00000001 << exponent) * (float)mantissa) * 0.045); max44009_valid = 1; return true; } else { return false; } } /********************************************************************************************/ void Max4409Detect(void) { uint8_t reg[8]; bool failed = false; if (max44009_found) { return; } uint8_t buffer1; uint8_t buffer2; for (uint8_t i = 0; 0 != max44009_addresses[i]; i++) { max44009_address = max44009_addresses[i]; if ((I2cValidRead8(&buffer1, max44009_address, REG_LOWER_THRESHOLD)) && (I2cValidRead8(&buffer2, max44009_address, REG_THRESHOLD_TIMER))) { //snprintf(log_data, sizeof(log_data), "MAX44009 %x: %x, %x", max44009_address, (int)buffer1, (int)buffer2); //AddLog(LOG_LEVEL_DEBUG_MORE); if ((0x00 == buffer1) && (0xFF == buffer2)) { // looks like a MAX44009, try to initialize Wire.beginTransmission(max44009_address); // select configuration register and set mode Wire.write(REG_CONFIG); Wire.write(MAX44009_CONTINUOUS_AUTO_MODE); if (0 == Wire.endTransmission()) { max44009_found = 1; snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, max44009_types, max44009_address); AddLog(LOG_LEVEL_DEBUG); break; } } } } } void Max4409EverySecond(void) { if (max44009_found) { Max4409Read_lum(); } } void Max4409Show(bool json) { char illum_str[8]; if (max44009_valid) { /* convert illuminance to string with suitable accuracy */ uint8_t prec = 0; if (10 > max44009_illuminance ) { prec = 3; } else if (100 > max44009_illuminance) { prec = 2; } else if (1000 > max44009_illuminance) { prec = 1; } dtostrf(max44009_illuminance, sizeof(illum_str) -1, prec, illum_str); if (json) { snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"%s\":{\"" D_JSON_ILLUMINANCE "\":%s}"), mqtt_data, max44009_types, illum_str); #ifdef USE_DOMOTICZ if (0 == tele_period) { DomoticzSensor(DZ_ILLUMINANCE, illum_str); } #endif // USE_DOMOTICZ #ifdef USE_WEBSERVER } else { // show integer value for lx on web-server snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ILLUMINANCE, mqtt_data, max44009_types, (int)max44009_illuminance); #endif // USE_WEBSERVER } } } /*********************************************************************************************\ * Interface \*********************************************************************************************/ bool Xsns41(uint8_t function) { bool result = false; if (i2c_flg) { switch (function) { case FUNC_INIT: Max4409Detect(); break; case FUNC_EVERY_SECOND: Max4409EverySecond(); break; case FUNC_JSON_APPEND: Max4409Show(1); break; #ifdef USE_WEBSERVER case FUNC_WEB_APPEND: Max4409Show(0); break; #endif // USE_WEBSERVER } } return result; } #endif // USE_MAX44009 #endif // USE_I2C