initial commit

Author: techniker

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

lib/telaire_T9602/telaire_T9602.cpp

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+#include "telaire_T9602.h"
+
+// Constructor
+T9602::T9602() {
+    sensorAddress = 0x28; // Default T9602 sensor I2C address
+    relativeHumidity = -9999;
+    temperature = -9999;
+}
+
+void T9602::begin(uint8_t address) {
+    sensorAddress = address;
+    Wire.begin();
+}
+
+void T9602::updateMeasurements() {
+    uint8_t data[4] = {0};
+    Wire.beginTransmission(sensorAddress);
+    Wire.write(0x00); // Command to read data
+    Wire.endTransmission();
+    Wire.requestFrom(sensorAddress, 4); // Request 4 bytes of data
+
+    // Store the 4 bytes of data
+    for (int i = 0; i < 4; ++i) {
+        data[i] = Wire.read();
+    }
+
+    // Calculate relative humidity
+    relativeHumidity = static_cast<float>(((data[0] & 0x3F) << 8) + data[1]) / 16384.0 * 100.0;
+    // Calculate temperature
+    temperature = static_cast<float>((static_cast<unsigned>(data[2]) * 64 + (static_cast<unsigned>(data[3]) >> 2)) / 16384.0 * 165.0 - 40.0);
+}
+
+float T9602::getHumidity() {
+    return relativeHumidity;
+}
+
+float T9602::getTemperature() {
+    return temperature;
+}
+
+String T9602::getString(bool takeNewReadings) {
+    if (takeNewReadings) {
+        updateMeasurements();
+    }
+
+    // Adjusted format to "Temp: value; Humidity: value"
+    return "Temp: " + String(temperature) + "; Humidity: " + String(relativeHumidity);
+}
+
+String T9602::getHeader() {
+    return "Relative Humidity [%],Temp [C],";
+}

lib/telaire_T9602/telaire_T9602.h

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+#ifndef TELAIRE_T9602_H
+#define TELAIRE_T9602_H
+
+#include <Arduino.h>
+#include <Wire.h>
+
+class T9602 {
+public:
+    T9602();
+    void begin(uint8_t address = 0x28); // Default sensor I2C address
+    void updateMeasurements(); // Fetches new measurement data from the sensor
+    float getHumidity(); // Returns the last measured humidity value
+    float getTemperature(); // Returns the last measured temperature value
+    String getString(bool takeNewReadings = false); // Returns formatted string with temperature and humidity
+    String getHeader(); // Returns CSV header string
+
+private:
+    uint8_t sensorAddress; // I2C address of the T9602 sensor
+    float relativeHumidity; // Last measured relative humidity
+    float temperature; // Last measured temperature
+};
+
+#endif // TELAIRE_T9602_H

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:d1_mini_lite]
+platform = espressif8266
+board = d1_mini_lite
+framework = arduino

src/main.cpp

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+/*
+ *  
+ * Read Telaire T9602 temperature and humidity sensor data and print to serial
+ *
+ * Author: Bjoern Heller <tec aett sixtopia.net>
+ */
+#include "telaire_T9602.h"
+#include <Arduino.h>
+#include <Wire.h>
+
+T9602 telaireSensor;
+
+void setup() {
+    Serial.begin(115200);
+    telaireSensor.begin();
+}
+
+void loop() {
+
+    telaireSensor.updateMeasurements();
+    float temperature = telaireSensor.getTemperature();
+    float humidity = telaireSensor.getHumidity();
+
+    char temperatureString[8];
+    dtostrf(temperature, 6, 2, temperatureString);
+    char humidityString[8];
+    dtostrf(humidity, 6, 2, humidityString);
+
+    Serial.print("Temp: ");
+    Serial.print(temperatureString);
+    Serial.print("; Humidity: ");
+    Serial.println(humidityString);
+
+    // Toggle LED to indicate data
+    digitalWrite(LED_BUILTIN, LOW);
+    delay(100);
+    digitalWrite(LED_BUILTIN, HIGH);
+
+    delay(1000); // Wait 1s before the next loop iteration
+}