Add sht3x_v2 for testing

Possibly fix loss of sht3x sensor (#1314)

sonoff/user_config.h

@@ -168,11 +168,12 @@
 //#define USE_DS18x20_LEGACY                       // Optional for more than one DS18x20 sensors with dynamic scan using library OneWire (+1k5 code)
 
 #define USE_I2C                                  // I2C using library wire (+10k code, 0k2 mem) - Disable by //
-  #define USE_SHT                                // Add I2C emulating code for SHT1X sensor
-//  #define USE_SHT3X                              // Add I2C code for SHT3x sensor
-  #define USE_HTU                                // Add I2C code for HTU21/SI7013/SI7020/SI7021 sensor
-  #define USE_BMP                                // Add I2C code for BMP/BME280 sensor
-  #define USE_BH1750                             // Add I2C code for BH1750 sensor
+  #define USE_SHT                                // Add I2C emulating code for SHT1X sensor (+1k4 code)
+//  #define USE_SHT3X                              // Add I2C code for SHT3x sensor based on Adafruit (+0k7 code)
+//  #define USE_SHT3X_V2                           // Add I2C code for SHT3x sensor based on EspEasy (+0k7 code)
+  #define USE_HTU                                // Add I2C code for HTU21/SI7013/SI7020/SI7021 sensor (+1k5 code)
+  #define USE_BMP                                // Add I2C code for BMP/BME280 sensor (+4k code)
+  #define USE_BH1750                             // Add I2C code for BH1750 sensor (+0k5 code)
 //  #define USE_VEML6070                           // Add I2C code for VEML6070 sensor (+0k5 code)
 //  #define USE_ADS1115                            // Add I2C code for ADS1115 16 bit A/D converter based on Adafruit ADS1x15 library (library not needed) (+0k7 code)
 //  #define USE_ADS1115_I2CDEV                     // Add I2C code for ADS1115 16 bit A/D converter using library i2cdevlib-Core and i2cdevlib-ADS1115 (+2k code)

sonoff/xsns_14_sht3x_v2.ino

@@ -0,0 +1,144 @@
+/*
+  xsns_14_sht3x.ino - SHT3X temperature and humidity sensor support for Sonoff-Tasmota
+
+  Copyright (C) 2017  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_SHT3X_V2
+/*********************************************************************************************\
+ * SHT3X - Temperature and Humidy
+ *
+ * Required library: none but based on EspEasy plugin 68
+ *
+ * I2C Address: 0x44 or 0x45
+\*********************************************************************************************/
+
+#define SHT3X_ADDR_GND      0x44  // address pin low (GND)
+#define SHT3X_ADDR_VDD      0x45  // address pin high (VDD)
+
+uint8_t sht3x_type = 0;
+uint8_t sht3x_address;
+uint8_t sht3x_addresses[] = { SHT3X_ADDR_GND, SHT3X_ADDR_VDD };
+
+bool Sht3xInit()
+{
+  if (sht3x_type) {
+    return I2cWrite8(sht3x_address, 0x20, 0x32);  // Periodic 0.5mps and repeatability high
+  }
+  return false;
+}
+
+bool Sht3xRead(float &t, float &h)
+{
+  unsigned int data[6];
+
+  t = NAN;
+  h = NAN;
+
+  I2cWrite8(sht3x_address, 0xE0, 0x00);  // Fetch data
+  Wire.requestFrom(sht3x_address, (uint8_t)6);
+  if (Wire.available() != 6) {
+    return false;
+  }
+  // Read 6 bytes of data
+  // cTemp msb, cTemp lsb, cTemp crc, humidity msb, humidity lsb, humidity crc
+  for (uint8_t i = 0; i < 6; i++) {
+    data[i] = Wire.read();
+  }
+  t = ConvertTemp((float)((((data[0] << 8) | data[1]) * 175) / 65535.0) - 45);
+  h = (float)((((data[3] << 8) | data[4]) * 100) / 65535.0);
+  return (!isnan(t) && !isnan(h));
+}
+
+/********************************************************************************************/
+
+void Sht3xDetect()
+{
+  if (sht3x_type) {
+    return;
+  }
+
+  sht3x_type = 1;
+  for (byte i = 0; i < sizeof(sht3x_addresses); i++) {
+    sht3x_address = sht3x_addresses[i];
+    if (Sht3xInit()) {
+      snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, "SHT3X", sht3x_address);
+      AddLog(LOG_LEVEL_DEBUG);
+      return;
+    }
+  }
+  sht3x_type = 0;
+}
+
+void Sht3xShow(boolean json)
+{
+  if (sht3x_type) {
+    float t;
+    float h;
+    if (Sht3xRead(t, h)) {
+      char temperature[10];
+      char humidity[10];
+      dtostrfd(t, Settings.flag2.temperature_resolution, temperature);
+      dtostrfd(h, Settings.flag2.humidity_resolution, humidity);
+
+      if (json) {
+        snprintf_P(mqtt_data, sizeof(mqtt_data), JSON_SNS_TEMPHUM, mqtt_data, "SHT3X", temperature, humidity);
+#ifdef USE_DOMOTICZ
+        DomoticzTempHumSensor(temperature, humidity);
+#endif  // USE_DOMOTICZ
+#ifdef USE_WEBSERVER
+      } else {
+        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, "SHT3X", temperature, TempUnit());
+        snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, "SHT3X", humidity);
+#endif  // USE_WEBSERVER
+      }
+    }
+  }
+}
+
+/*********************************************************************************************\
+ * Interface
+\*********************************************************************************************/
+
+#define XSNS_14
+
+boolean Xsns14(byte function)
+{
+  boolean result = false;
+
+  if (i2c_flg) {
+    switch (function) {
+      case FUNC_XSNS_INIT:
+        Sht3xDetect();
+        break;
+//      case FUNC_XSNS_PREP:
+//        break;
+      case FUNC_XSNS_JSON_APPEND:
+        Sht3xShow(1);
+        break;
+#ifdef USE_WEBSERVER
+      case FUNC_XSNS_WEB:
+        Sht3xShow(0);
+        break;
+#endif  // USE_WEBSERVER
+    }
+  }
+  return result;
+}
+
+#endif  // USE_SHT3X_V2
+#endif  // USE_I2C