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https://github.com/arendst/Tasmota.git
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Merge pull request #4907 from llagendijk/development
Add support for MAX44009 ambient light sensor
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commit
669f6c86c9
@ -328,6 +328,7 @@
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// #define USE_PN532_I2C // Enable PN532 - Near Field Communication (NFC) controller (+1k7 code, 164 bytes of mem)
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// #define USE_PN532_DATA_FUNCTION // Enable PN532 DATA Usage using Sensor15 command (+1k6 code, 316 bytes of mem)
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// #define USE_PN532_CAUSE_EVENTS // Enable PN532 driver to cause event's on card read in addition to immediate telemetry (+64 bytes code, 48 bytes mem)
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// #define USE_MAX44009 // Enable MAX44009 Ambient Light sensor (I2C addresses 0x4A and 0x4B) (+0k8 code)
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// #define USE_DISPLAY // Add I2C Display Support (+2k code)
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#define USE_DISPLAY_MODES1TO5 // Enable display mode 1 to 5 in addition to mode 0
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@ -342,7 +343,6 @@
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#define MTX_ADDRESS6 0x76 // [DisplayAddress6] I2C address of sixth 8x8 matrix module
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#define MTX_ADDRESS7 0x00 // [DisplayAddress7] I2C address of seventh 8x8 matrix module
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#define MTX_ADDRESS8 0x00 // [DisplayAddress8] I2C address of eigth 8x8 matrix module
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#endif // USE_I2C
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// -- SPI sensors ---------------------------------
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180
sonoff/xsns_91_max44009.ino
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180
sonoff/xsns_91_max44009.ino
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@ -0,0 +1,180 @@
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/*
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xsns_91_max44009.ino - MAX44009 ambient light sensor support for Sonoff-Tasmota
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Copyright (C) 2019 Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_I2C
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#ifdef USE_MAX44009
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/*********************************************************************************************\
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* MAX44009 - Ambient Light Intensity
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*
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* I2C Address: 0x4a or 0x4b
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\*********************************************************************************************/
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#define XSNS_91 91
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#define MAX44009_ADDR1 0x4A
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#define MAX44009_ADDR2 0x4B
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#define MAX44009_NO_REGISTERS 8
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#define REG_CONFIG 0x02
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#define REG_LUMINANCE 0x03
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#define REG_LOWER_THRESHOLD 0x06
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#define REG_THRESHOLD_TIMER 0x07
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#define MAX44009_CONTINUOUS_AUTO_MODE 0x80 // Start measurement in automatic, continous mode
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uint8_t max44009_address;
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uint8_t max44009_addresses[] = { MAX44009_ADDR1, MAX44009_ADDR2, 0 }; //0 terminated list
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uint8_t max44009_found = 0;
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uint8_t max44009_valid = 0;
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float max44009_illuminance = 0;
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char max44009_types[] = "MAX44009";
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bool Max4409Read_lum(void)
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{
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max44009_valid = 0;
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uint8_t regdata[2];
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/* Read 2 bytes luminance */
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if (I2cValidRead16((uint16_t *)®data, max44009_address, REG_LUMINANCE)) {
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int exponent = (regdata[0] & 0xF0) >> 4;
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int mantissa = ((regdata[0] & 0x0F) << 4) | (regdata[1] & 0x0F);
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max44009_illuminance = (float)(((0x00000001 << exponent) * (float)mantissa) * 0.045);
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max44009_valid = 1;
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return true;
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} else {
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return false;
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}
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}
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/********************************************************************************************/
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void Max4409Detect(void)
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{
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byte reg[8];
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bool failed = false;
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if (max44009_found) {
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return;
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}
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uint8_t buffer1;
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uint8_t buffer2;
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for (byte i = 0; 0 != max44009_addresses[i]; i++) {
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max44009_address = max44009_addresses[i];
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if ((I2cValidRead8(&buffer1, max44009_address, REG_LOWER_THRESHOLD)) &&
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(I2cValidRead8(&buffer2, max44009_address, REG_THRESHOLD_TIMER))) {
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//snprintf(log_data, sizeof(log_data), "MAX44009 %x: %x, %x", max44009_address, (int)buffer1, (int)buffer2);
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//AddLog(LOG_LEVEL_DEBUG_MORE);
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if ((0x00 == buffer1) &&
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(0xFF == buffer2)) {
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// looks like a MAX44009, try to initialize
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Wire.beginTransmission(max44009_address);
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// select configuration register and set mode
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Wire.write(REG_CONFIG);
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Wire.write(MAX44009_CONTINUOUS_AUTO_MODE);
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if (0 == Wire.endTransmission()) {
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max44009_found = 1;
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snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, max44009_types, max44009_address);
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AddLog(LOG_LEVEL_DEBUG);
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break;
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}
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}
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}
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}
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}
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void Max4409EverySecond(void)
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{
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if (max44009_found) {
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Max4409Read_lum();
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}
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}
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void Max4409Show(boolean json)
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{
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char illum_str[8];
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if (max44009_valid) {
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/* convert illuminance to string with suitable accuracy */
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uint8_t prec = 0;
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if (10 > max44009_illuminance ) {
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prec = 3;
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} else if (100 > max44009_illuminance) {
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prec = 2;
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} else if (1000 > max44009_illuminance) {
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prec = 1;
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}
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dtostrf(max44009_illuminance, sizeof(illum_str) -1, prec, illum_str);
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if (json) {
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snprintf_P(mqtt_data, sizeof(mqtt_data),
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PSTR("%s,\"%s\":{\"" D_JSON_ILLUMINANCE "\":%s}"),
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mqtt_data, max44009_types, illum_str);
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#ifdef USE_DOMOTICZ
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if (0 == tele_period) {
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DomoticzSensor(DZ_ILLUMINANCE, illum_str);
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}
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#endif // USE_DOMOTICZ
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#ifdef USE_WEBSERVER
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} else {
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// show integer value for lx on web-server
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snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ILLUMINANCE,
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mqtt_data, max44009_types, (int)max44009_illuminance);
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#endif // USE_WEBSERVER
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}
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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boolean Xsns91(byte function)
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{
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boolean result = false;
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if (i2c_flg) {
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switch (function) {
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case FUNC_INIT:
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Max4409Detect();
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break;
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case FUNC_EVERY_SECOND:
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Max4409EverySecond();
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break;
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case FUNC_JSON_APPEND:
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Max4409Show(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_APPEND:
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Max4409Show(0);
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break;
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#endif // USE_WEBSERVER
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}
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}
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return result;
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}
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#endif // USE_MAX44009
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#endif // USE_I2C
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