Calibration

This guide will help you calibrate your Crimpdeq device to ensure accurate weight measurements. The calibration process involves using a known weight to establish a reference point for the device's measurements.

  1. Download and install the nRF Connect app for your platform:
  2. Connect nRF Connect with Crimpdeq:
    1. Launch the nRF Connect app.
    2. Navigate to the Scanner tab.
    3. Look for a device named "Progressor_7125".
    4. Tap "Connect".
    5. Once connected, the app will display the device's services and characteristics. nRF Discovered
  3. Locate the Calibration Characteristic:
    1. Expand the "Unknown Service" section.
    2. Look for the characteristic with UUID: 7e4e1703-1ea6-40c9-9dcc-13d34ffead57. Services
  4. Calculate the Hex Value of your known weight:
    1. Open the Floating Point to Hex Converter.
    2. Use "Single-precision" floating point converter.
    3. Enter your known weight in the "Float value" field.
    4. Click "Convert to hex".
    5. Save the resulting "Hex value". Example: For a known weight of 75.3 kg, the hex value would be 0x4296999a.
  5. Perform Calibration:
    1. Hang your Crimpdeq with no weight attached.
    2. Send the command 7300000000 to the characteristic:

      • Tap the Up Arrow icon on the characteristic (7e4e1703-1ea6-40c9-9dcc-13d34ffead57).

      • Enter the command as shown in the screenshot.

        Send weight

    3. Now, attach your known weight to the Crimpdeq.
    4. Prepare the calibration command:
      • Take your hex value from the previous step.
      • Add 73 at the beginning. Example: For 75.3 kg (0x4296999a), the command would be: 734296999a.
    5. Send this new command to the same characteristic (7e4e1703-1ea6-40c9-9dcc-13d34ffead57).

Important Notes

  • The known weight should be greater than the maximum weight you plan to measure.
  • Make sure the device is stable and not moving when sending calibration commands.
  • The calibration process should be performed in a controlled environment.