Add untracked files from dual-melexis-sensors

Author: roman-dvorak

doc/data/AMSKY01_20260103_18.h5

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+# MLX90641 I2C Address Change Utility
+
+This utility changes the I2C address of MLX90641 thermal sensor from default **0x33** to **0x35**.
+
+## ⚠️ Important Warnings
+
+1. **Only ONE MLX90641 sensor** should be connected to the I2C bus during this operation
+2. The address change is **permanent** (written to EEPROM)
+3. A **power cycle is required** after the address change for it to take effect
+4. Make sure no other devices are using address 0x35 on the I2C bus
+
+## Building the Utility
+
+```bash
+# Build using the special configuration
+pio run -c platformio_change_addr.ini
+
+# Upload to device
+pio run -c platformio_change_addr.ini -t upload
+```
+
+## Usage
+
+1. **Connect only ONE MLX90641 sensor** to the AMSKY01 board
+2. Upload and run the address change utility
+3. Open serial monitor at 115200 baud
+4. The program will:
+   - Check for sensor at old address (0x33)
+   - Check for sensor at new address (0x35)
+   - Write new address to EEPROM using broadcast (0x00)
+   - Verify the write
+5. **Power cycle the sensor** (remove and reconnect power)
+6. The sensor will now respond at address **0x35**
+
+## Expected Output
+
+```
+========================================
+MLX90641 I2C Address Change Utility
+========================================
+
+WARNING: Only ONE MLX90641 sensor should be on the I2C bus!
+
+I2C bus initialized
+
+Checking for sensor at address 0x33... FOUND
+Reading current EEPROM address register... 0x33
+Checking for sensor at address 0x35... NOT FOUND
+
+========================================
+Starting address change procedure
+========================================
+
+Writing new address 0x35 to EEPROM...
+  Broadcasting to address 0x0, register 0x240F, data 0x35
+  Write completed
+SUCCESS: Address written to EEPROM
+
+========================================
+IMPORTANT: Power cycle the sensor now!
+========================================
+
+After power cycle, the sensor will respond at address 0x35
+```
+
+## LED Indicators
+
+- **3 blinks every 2 seconds**: Success - power cycle the sensor
+- **10 rapid blinks every second**: Error - check connections
+
+## Verification
+
+After power cycle, you can verify the address change:
+
+```bash
+# Scan I2C bus
+i2cdetect -y 1
+
+# Or use the main firmware - it should detect the sensor at 0x35
+```
+
+## Reverting to Original Address
+
+To change back to 0x33, modify `change_address_main.cpp`:
+
+```cpp
+#define MLX90641_OLD_ADDR 0x35         // Current address
+#define MLX90641_NEW_ADDR 0x33         // Target address
+```
+
+Then rebuild and run the utility again.
+
+## Technical Details
+
+- **EEPROM Register**: 0x240F
+- **Data Format**: Lower 7 bits contain the I2C address
+- **Broadcast Address**: 0x00 (responds to all devices)
+- **Write Time**: ~50ms for EEPROM write completion
+- **Activation**: Requires power cycle
+
+## Troubleshooting
+
+### Sensor not found at 0x33
+- Check I2C connections (SDA=GPIO18, SCL=GPIO19)
+- Verify sensor power supply
+- Check if sensor address was already changed
+
+### Write verification failed
+- This is usually OK - verification can fail when using broadcast address
+- Proceed with power cycle if write succeeded
+
+### Sensor still responds at old address after power cycle
+- EEPROM write might have failed
+- Try running the utility again
+- Check for I2C bus errors in serial output
+
+## References
+
+- MLX90641 Datasheet: Section on I2C address configuration
+- EEPROM address register: 0x240F
+- Default factory address: 0x33

doc/data/AMSKY01_20260103_19.h5

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+[platformio]
+default_envs = change_address
+
+[env:change_address]
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+board = amsky01
+framework = arduino
+board_build.core = earlephilhower
+board_build.filesystem_size = 0.5m
+monitor_speed = 115200
+upload_protocol = picotool
+
+; Build only the address change utility
+build_src_filter = 
+    -<*>
+    +<change_address_main.cpp>
+
+build_flags =
+    -DCHANGE_ADDRESS_MODE