yyup

works

Firmware/Calibration & Test Code/I2Cworks.txt

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+#include <Arduino.h>
+#include <Wire.h>
+#include <Adafruit_BMP085.h>
+#include <QMC5883LCompass.h>
+
+// Initialize sensor objects
+Adafruit_BMP085 bmp;
+QMC5883LCompass compass;
+
+// Flags and variables
+bool bmp_working = false;
+const int I2C_SDA = 21;
+const int I2C_SCL = 22;
+
+// Function to scan the bus and return number of devices
+int scanI2CBus() {
+  Serial.println("--- Scanning I2C Bus ---");
+  byte error, address;
+  int nDevices = 0;
+  
+  // A standard I2C scanner helps determine if the hardware is electrically connected
+  for(address = 1; address < 127; address++ ) {
+    Wire.beginTransmission(address);
+    error = Wire.endTransmission();
+    
+    if (error == 0) {
+      Serial.print("Found device at 0x");
+      if (address < 16) Serial.print("0");
+      Serial.print(address, HEX);
+      
+      // Identify common addresses
+      if (address == 0x77) Serial.println(" (Likely BMP180)");
+      else if (address == 0x0D) Serial.println(" (Likely QMC5883L)");
+      else Serial.println(" (Unknown Device)");
+      
+      nDevices++;
+    } else if (error == 4) {
+      Serial.print("Unknown error at address 0x");
+      if (address < 16) Serial.print("0");
+      Serial.println(address, HEX);
+    }
+  }
+  return nDevices;
+}
+
+void setup() {
+  Serial.begin(115200);
+  delay(2000); // Give serial monitor time to connect
+
+  // Initialize I2C with stability settings
+  // Default for ESP32 DevKit V1 is SDA=21, SCL=22
+  Wire.begin(I2C_SDA, I2C_SCL);
+  Wire.setClock(100000); // Standard 100kHz mode is safer for jumper wires
+  Wire.setTimeOut(1000); // Timeout to prevent the CPU from hanging on a bad bus
+  
+  int devicesFound = scanI2CBus();
+  
+  if (devicesFound == 0) {
+    Serial.println("ERROR: No I2C devices detected!");
+    Serial.println("1. Check if 3.3V and GND are connected to both sensors.");
+    Serial.println("2. Check if SDA is on Pin 21 and SCL is on Pin 22.");
+    Serial.println("3. Ensure your soldering joints are making contact with the pads.");
+  }
+
+  Serial.println("\n--- Initializing Sensor Libraries ---");
+
+  // BMP180 Initialization
+  if (!bmp.begin()) {
+    Serial.println("BMP180: FAILED to initialize library.");
+    bmp_working = false;
+  } else {
+    Serial.println("BMP180: SUCCESS");
+    bmp_working = true;
+  }
+
+  // QMC5883L Initialization
+  compass.init();
+  compass.setSmoothing(10, true);
+  Serial.println("QMC5883L: Initialized (Note: init() does not check for presence)");
+  
+  Serial.println("----------------------------\n");
+}
+
+void loop() {
+  Serial.println("========== SENSOR DATA ==========");
+  
+  // 1. Process BMP180
+  if (bmp_working) {
+    float temp = bmp.readTemperature();
+    // Check for logical errors (extreme values)
+    if (temp < -40 || temp > 80) {
+       Serial.println("[BMP180]   Data Error: Reading out of range.");
+    } else {
+       Serial.print("[BMP180]   Temp: "); Serial.print(temp);
+       Serial.print(" C | Pressure: "); Serial.print(bmp.readPressure()); Serial.println(" Pa");
+    }
+  } else {
+    Serial.println("[BMP180]   OFFLINE (Initialization failed)");
+  }
+
+  // 2. Process QMC5883L
+  compass.read();
+  int x = compass.getX();
+  int y = compass.getY();
+  int z = compass.getZ();
+
+  // If the compass returns all zeros, it is physically disconnected or the bus crashed
+  if (x == 0 && y == 0 && z == 0) {
+    Serial.println("[QMC5883L] OFFLINE (Returning all zeros)");
+    
+    // Attempt emergency bus recovery if we lost communication
+    Serial.println("Attempting I2C Bus Reset...");
+    Wire.end();
+    delay(100);
+    Wire.begin(I2C_SDA, I2C_SCL);
+    Wire.setClock(100000);
+  } else {
+    Serial.print("[QMC5883L] X: "); Serial.print(x);
+    Serial.print(" | Y: "); Serial.print(y);
+    Serial.print(" | Z: "); Serial.print(z);
+    Serial.print(" | Heading: "); Serial.print(compass.getAzimuth()); Serial.println("°");
+  }
+
+  Serial.println("=================================\n");
+  delay(1000);
+}