Standard Operating Procedure

Operation of the Csmart-Digit Device

Purpose

To define the standardized procedure for operating the Csmart-Digit device to ensure consistent, accurate, and reliable analysis of green coffee samples.

Scope

This SOP applies to all qualified personnel involved in the operation and interpretation of results generated by the Csmart-Digit device. It does not cover AI model development, dataset generation, or hardware servicing.

Role	Responsibility
Operator	Execute analysis and perform basic troubleshooting
Analyst	Validate output, interpret data, and provide feedback
QA Supervisor	Monitor accuracy and compliance
Maintenance Tech	Maintain and calibrate device

Definitions

• AI Model: A deep neural network used by Csmart-Digit to classify seeds. Each model consists of two files stored in the same folder:

  • .onnx – contains the model weights and architecture.

  • .json – describes the model metadata, class labels, defect scores, and grading parameters.

Materials and Equipment Required

• Csmart-Digit device

• Csmart-Digit communication token

• Csmart-Digit software

• Laptop or desktop computer (minimum specs) with the software installed

• Tray, funnel, and brush

• 300g sample of green coffee beans

Safety Conditions

• Avoid physical interference with the belt conveyor and any moving parts while the device is in operation.

• Place the device on a dedicated, stable, and level surface capable of supporting its weight.

• Do not operate the device with wet hands or in humid environments.

Operating Temperature	15–28 °C
Maximum Relative Humidity	75%

Procedure for Standard Operation

Startup

• Power on the device, according to Powering On Procedures.

• Power the computer and launch the Csmart-Digit software.

• Ensure all cables and connections (USB from Token, USB from camera, and power cable) are correctly in place.

Mechanical and Electrical System Check

Before beginning any analysis, ensure that all mechanical and electrical systems are properly functioning.

Open the Acquisition Settings page in the Csmart-Digit software.

Perform the following activations:

• Click Camera On to initiate the vision system.

• Switch Light to On to verify illumination.

• Switch Belt to On to start the movement.

Confirm that the following configuration parameters are set appropriately:

• Pixel/cm ratio (used for accurate sizing and screen classification).

• Min and Max Area filters (ensure these values are aligned with the size range of the seeds in your sample).

Belt movement and illumination:

• The belt should run smoothly.

• Illumination should be uniform and clear across the entire field of view.

Note: Light flickering is perceived due to the use of overdrive.

Attention: Ensure there is no direct light source or sunlight hitting the capture area

Mechanical Cleanliness:

• Ensure the hopper is empty and contains no residual seeds from previous analyses.

• Inspect the belt conveyor to confirm it is free from:

  • Leftover seeds

  • Dust

  • Foreign matter

• If cleaning is needed:

  • Use a soft brush to gently remove any debris from the hopper and visible parts of the conveyor.

  • If required, clean the belt using a lightly moistened disposable wipe:

    • Hold the wipe gently at the end of the moving belt.

    • Apply light pressure to clean the surface.

    • Do not over-moisten; the belt must remain dry to ensure proper imaging and transport.

Caution: Never apply water, alcohol, or other cleaners directly to any part of the machine. Excessive moisture can damage optical and electronic components.

Sample Preparation

• Weigh 300 grams of green coffee beans.

• Ensure the sample is statistically representative of the coffee lot it aims to represent.

• Place a collection tray at the end of the belt conveyor. The tray must be capable of collecting at least 300 grams of coffee.

• Ensure the sample is within the nominal seed range supported by the device:

Nominal Seed Range	2 - 20mm