Keyboard shortcuts

Press ← or → to navigate between chapters

Press S or / to search in the book

Press ? to show this help

Press Esc to hide this help

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.

      ⚠️ Note: Some scales require sending the command in grams instead of kilograms. Im still investigating this, but if after calibrating the device, the weight looks like divided by 100, try sending the command in grams.

    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.