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ES/ES assignment 4/ES assignment 3 I2C/Assignment-A/BME280.cpp

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+
+#include "BME280.h"
+
+// I2C read 1 byte
+uint8_t readRegister(uint8_t reg) {
+    Wire.beginTransmission(BME280_ADDRESS);
+    Wire.write(reg);
+    Wire.endTransmission();
+    Wire.requestFrom(BME280_ADDRESS, 1);
+    return Wire.read();
+}
+
+// I2C write 1 byte
+void writeRegister(uint8_t reg, uint8_t value) {
+    Wire.beginTransmission(BME280_ADDRESS);
+    Wire.write(reg);
+    Wire.write(value);
+    Wire.endTransmission();
+}
+
+// Public functions
+uint8_t BME280_GetID() {
+    return readRegister(BME280_REG_ID);
+}
+
+void BME280_Reset() {
+    writeRegister(BME280_REG_RESET, BME280_RESET_CMD);
+}
+
+uint8_t BME280_CtrlHum() {
+    return readRegister(BME280_REG_CTRL_HUM);
+}
+
+void BME280_CtrlHum(uint8_t bitpattern) {
+    writeRegister(BME280_REG_CTRL_HUM, bitpattern);
+}
+
+uint8_t BME280_CtrlMeas() {
+    return readRegister(BME280_REG_CTRL_MEAS);
+}
+
+void BME280_CtrlMeas(uint8_t bitpattern) {
+    writeRegister(BME280_REG_CTRL_MEAS, bitpattern);
+}
+
+long BME280_ReadTemperature() {
+    Wire.beginTransmission(BME280_ADDRESS);
+    Wire.write(BME280_REG_TEMP_MSB);
+    Wire.endTransmission();
+    Wire.requestFrom(BME280_ADDRESS, 3);
+
+    long msb = Wire.read();
+    long lsb = Wire.read();
+    long xlsb = Wire.read();
+    long adc_T = ((msb << 16) | (lsb << 8) | xlsb) >> 4;
+
+    return adc_T; // Raw value (compensation needed)
+}
+
+int BME280_ReadHumidity() {
+    Wire.beginTransmission(BME280_ADDRESS);
+    Wire.write(BME280_REG_HUM_MSB);
+    Wire.endTransmission();
+    Wire.requestFrom(BME280_ADDRESS, 2);
+
+    int msb = Wire.read();
+    int lsb = Wire.read();
+    int adc_H = (msb << 8) | lsb;
+
+    return adc_H; // Raw value
+}
+
+long BME280_ReadPressure() {
+    Wire.beginTransmission(BME280_ADDRESS);
+    Wire.write(BME280_REG_PRESS_MSB);
+    Wire.endTransmission();
+    Wire.requestFrom(BME280_ADDRESS, 3);
+
+    long msb = Wire.read();
+    long lsb = Wire.read();
+    long xlsb = Wire.read();
+    long adc_P = ((msb << 16) | (lsb << 8) | xlsb) >> 4;
+
+    return adc_P; // Raw value
+}

ES/ES assignment 4/ES assignment 3 I2C/Assignment-A/BME280.h

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+#ifndef BME280_H
+#define BME280_H
+
+#include <Arduino.h>
+#include <Wire.h>
+
+// I2C address for BME280 (default)
+#define BME280_ADDRESS 0x76
+
+// Register addresses from datasheet
+#define BME280_REG_ID           0xD0
+#define BME280_REG_RESET        0xE0
+#define BME280_REG_CTRL_HUM     0xF2
+#define BME280_REG_STATUS       0xF3
+#define BME280_REG_CTRL_MEAS    0xF4
+#define BME280_REG_CONFIG       0xF5
+#define BME280_REG_PRESS_MSB    0xF7
+#define BME280_REG_TEMP_MSB     0xFA
+#define BME280_REG_HUM_MSB      0xFD
+
+// Reset command
+#define BME280_RESET_CMD        0xB6
+
+// Function declarations
+uint8_t BME280_GetID();
+
+void BME280_Reset();
+
+uint8_t BME280_CtrlHum();
+
+void BME280_CtrlHum(uint8_t bitpattern);
+
+uint8_t BME280_CtrlMeas();
+
+void BME280_CtrlMeas(uint8_t bitpattern);
+
+long BME280_ReadTemperature();
+
+int BME280_ReadHumidity();
+
+long BME280_ReadPressure();
+
+#endif

ES/ES assignment 4/ES assignment 3 I2C/Assignment-A/main.cpp

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+#include <Arduino.h>
+#include <Wire.h>
+#include "BME280.h"
+
+void setup() {
+    Serial.begin(9600);
+    Wire.begin();
+
+    Serial.println("Initializing BME280...");
+
+    uint8_t id = BME280_GetID();
+    Serial.print("Sensor ID: 0x");
+    Serial.println(id, HEX);
+
+    BME280_Reset();
+
+    // Set oversampling for humidity = x1 (00000001)
+    BME280_CtrlHum(0x01);
+
+    // Set oversampling for temp and pressure = x1, mode = normal (00100111)
+    BME280_CtrlMeas(0x27);
+
+    Serial.println("BME280 Setup Done.");
+}
+
+void loop() {
+    long temp_raw = BME280_ReadTemperature();
+    int hum_raw = BME280_ReadHumidity();
+    long press_raw = BME280_ReadPressure();
+
+    Serial.print("Raw Temperature: ");
+    Serial.print(temp_raw);
+    Serial.print(" | Raw Humidity: ");
+    Serial.print(hum_raw);
+    Serial.print(" | Raw Pressure: ");
+    Serial.println(press_raw);
+}