Added support for AHT10/AHT20 temperature + humidity sensors (#761)

platformio.ini

@@ -76,6 +76,7 @@ lib_deps = ${common.lib_deps}
 [sensors]
 lib_deps =
 	adafruit/Adafruit Unified Sensor@^1.1.4
+	adafruit/Adafruit AHTX0@^2.0.3
 	adafruit/Adafruit BME280 Library@^2.2.2
 	adafruit/Adafruit BMP085 Library@^1.2.1
 	adafruit/Adafruit BMP280 Library@^2.6.3

src/AHTX0.cpp

@@ -0,0 +1,82 @@
+#ifdef SENSORS
+#include "AHTX0.h"
+
+#include "globals.h"
+#include "mqtt.h"
+#include "defaults.h"
+#include <AsyncWiFiSettings.h>
+#include "string_utils.h"
+
+#include <Adafruit_AHTX0.h>
+
+namespace AHTX0
+{
+    Adafruit_AHTX0* aht;
+    long AHTX0_status;
+    String AHTX0_I2c;
+    int AHTX0_I2c_Bus;
+    unsigned long AHTX0PreviousMillis = 0;
+    int sensorInterval = 60000;
+    bool initialized = false;
+
+    void Setup()
+    {
+        if (!I2C_Bus_1_Started && !I2C_Bus_2_Started) return;
+
+        aht = new Adafruit_AHTX0();
+        if (AHTX0_I2c == "0x38") {
+            AHTX0_status = aht->begin(AHTX0_I2c_Bus == 1 ? &Wire : &Wire1, 0x38);
+        } else if (AHTX0_I2c == "0x39") {
+            AHTX0_status = aht->begin(AHTX0_I2c_Bus == 1 ? &Wire : &Wire1, 0x39);
+        } else {
+            return;
+        }
+
+        if (!AHTX0_status) {
+            Serial.println("[AHTX0] Couldn't find a sensor, check your wiring and I2C address!");
+        } else {
+            initialized = true;
+        }
+    }
+
+    void ConnectToWifi()
+    {
+        AsyncWiFiSettings.html("h4", "AHTX0 - Temperature + Humidity Sensor:");
+        AHTX0_I2c_Bus = AsyncWiFiSettings.integer("AHTX0_I2c_Bus", 1, 2, DEFAULT_I2C_BUS, "I2C Bus");
+        AHTX0_I2c = AsyncWiFiSettings.string("AHTX0_I2c", "", "I2C address (0x38 or 0x39)");
+    }
+
+    void SerialReport()
+    {
+        if (!I2C_Bus_1_Started && !I2C_Bus_2_Started) return;
+        if (AHTX0_I2c.isEmpty()) return;
+        Serial.print("AHTX0_I2c Sensor: ");
+        Serial.println(AHTX0_I2c + " on bus " + AHTX0_I2c_Bus);
+    }
+
+    void Loop()
+    {
+        if (!I2C_Bus_1_Started && !I2C_Bus_2_Started) return;
+        if (!initialized) return;
+
+        if (AHTX0PreviousMillis == 0 || millis() - AHTX0PreviousMillis >= sensorInterval) {
+            sensors_event_t humidity, temp;
+            aht->getEvent(&humidity, &temp);
+
+            pub((roomsTopic + "/AHTX0_temperature").c_str(), 0, 1, String(temp.temperature).c_str());
+            pub((roomsTopic + "/AHTX0_humidity").c_str(), 0, 1, String(humidity.relative_humidity).c_str());
+
+            AHTX0PreviousMillis = millis();
+        }
+    }
+
+    bool SendDiscovery()
+    {
+        if (AHTX0_I2c.isEmpty()) return true;
+
+        return sendSensorDiscovery("AHTX0 Temperature", EC_NONE, "temperature", "°C")
+            && sendSensorDiscovery("AHTX0 Humidity", EC_NONE, "humidity", "%");
+    }
+}
+
+#endif

src/AHTX0.h

@@ -0,0 +1,14 @@
+#pragma once
+#ifdef SENSORS
+#include <ArduinoJson.h>
+
+namespace AHTX0
+{
+    void ConnectToWifi();
+    void SerialReport();
+    bool SendDiscovery();
+    void Setup();
+    void Loop();
+}
+
+#endif

src/main.cpp

@@ -43,6 +43,7 @@ bool sendTelemetry(unsigned int totalSeen, unsigned int totalFpSeen, int unsigne
             && Battery::SendDiscovery()
 #ifdef SENSORS
             && DHT::SendDiscovery()
+            && AHTX0::SendDiscovery()
             && BH1750::SendDiscovery()
             && BME280::SendDiscovery()
             && BMP180::SendDiscovery()
@@ -174,6 +175,7 @@ void setupNetwork() {
 
     AsyncWiFiSettings.heading("I2C Sensors <a href='https://espresense.com/configuration/settings#i2c-sensors' target='_blank'>ℹ️</a>", false);
 
+    AHTX0::ConnectToWifi();
     BH1750::ConnectToWifi();
     BME280::ConnectToWifi();
     BMP180::ConnectToWifi();
@@ -234,6 +236,7 @@ void setupNetwork() {
     I2C::SerialReport();
 #ifdef SENSORS
     DHT::SerialReport();
+    AHTX0::SerialReport();
     BH1750::SerialReport();
     BME280::SerialReport();
     BMP180::SerialReport();
@@ -503,6 +506,7 @@ void setup() {
 #ifdef SENSORS
     DHT::Setup();
     I2C::Setup();
+    AHTX0::Setup();
     BH1750::Setup();
     BME280::Setup();
     BMP180::Setup();
@@ -533,6 +537,7 @@ void loop() {
 #endif
 #ifdef SENSORS
     DHT::Loop();
+    AHTX0::Loop();
     BH1750::Loop();
     BME280::Loop();
     BMP180::Loop();

src/main.h

@@ -35,6 +35,7 @@
 #include "BME280.h"
 #include "BMP180.h"
 #include "BMP280.h"
+#include "AHTX0.h"
 #include "DHT.h"
 #include "HX711.h"
 #include "SHT.h"