Sub-units

Most hardware products are made of multiple components, tested individually and at each step of assembly to the final product. TofuPilot's sub-unit features enable automatic test traceability through the entire process.

This guide explains how to use TofuPilot's sub-units feature to automatically ensure the traceability of tests and serial numbers throughout the assembly process.

Test Strategy

Introduction

A good industrial test strategy relies on several key steps:

• Early Test Deployment: Install tests early at the supplier or assembler, matching each assembly stage.
• Automated Tests: Prioritize automation to reduce errors and save time.
• Standardization and Log Collection: Standardize logs and systematically collect results.

Flowchart Example

A test flowchart can be created to provide the manufacturing test team with an overview of the product's testbenches.

In this example of a smart-battery testing strategy:

• PCBA: a firmware flash and test is performed at the supplier to verify the integrated components (gauge, LEDs...).
• Chemical Cells: a test is performed on the battery cells to check voltage levels.
• Thermal Probes: no tests are performed for thermal probes that are purchased off-the-shelf.
• Smart Battery Assembly: a test is performed after final assembly to ensure proper integration of all components.

Flowchart Template

Use our Figma template to quickly create a test flowchart for your product.

Example

To add sub-units in an assembly test, specify their serial number in the sub-units parameter in create-run.

from tofupilot import TofuPilotClient

client = TofuPilotClient()

def test_function():
    # your test execution goes here
    return True

run_passed = test_function()

client.create_run(
    procedure_id="FVT3",
    unit_under_test={
      "serial_number": "BAT01-0001",
      "part_number": "BAT01"
    },
    run_passed=run_passed,
    sub_units=[
      {"serial_number": "PCBA01-0001"},
      {"serial_number": "CELL01-0001"},
      {"serial_number": "CELL01-0002"},
      {"serial_number": "CELL01-0003"}
    ]
)

Unit Pages

The battery assembly was created with its sub-units automatically listed as children in the unit list. You can see and navigate to these sub-units using the expansion menu on the left.

On the specific battery assembly page, the Sub-units section allows you to view and navigate to their individual pages.