2025

Portable LiFePO4-Powered Analog Monitor with LCD Output

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This article describes work around a portable embedded measurement device, focusing on analog signal acquisition, battery-powered operation, and local display.

The system is powered by a rechargeable LiFePO4 cell, with integrated charging and protection circuitry to handle safe operation, monitoring, and undervoltage conditions.

An ESP32-S3 microcontroller is used to read an analog sensor through its ADC, apply basic processing (scaling/filtering), and update an LCD display with real-time values. Battery voltage is also monitored to report operating state and prevent unreliable readings at low charge.

Overall, the design combines portable power management, analog sensing, and a simple local interface in a compact standalone device.

Connexion Test Bench

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This article describes work around an automated cable harness test bench, focused on scalable I/O acquisition, real-time detection, and operator-facing display.

The system is built on a Raspberry Pi 4, used to run the user interface and manage test execution. A local HMI guides the operator, displays connection status, and reports pass/fail results during testing.

A large number of lines are monitored using I/O expanders, allowing many connections to be checked in parallel. Test logic identifies common wiring issues such as opens, shorts, swapped lines, or inverted connections, with results updated on-screen in real time.

Overall, the design centers on reliable multi-channel continuity checking with clear visual feedback and a workflow-oriented interface.