Week 6 — Electronics design

This week’s topic: Electronics design.

Group assignment

In Shenzhen Chaihuo, our group used a multimeter and a digital oscilloscope to observe a running embedded board. The focus was practical measurement workflow: probe placement, instrument setup, and interpreting readings against real board behavior.

Work objective

We documented a repeatable Week 6 measurement routine: verify DC rails with DMM, perform a quick probe sanity check, and capture stable waveform evidence with a digital storage oscilloscope.

1) Team setup and bench coordination

Before probing, we aligned on wiring and measurement sequence together. This lowered the chance of shorts and made sure all team members interpreted instrument readings consistently.

Team discussion with tablet at the bench — Setup photo A - Team confirming procedure and references before measurement.

Bench wiring and microcontroller setup — Setup photo B - Wiring and debugging context around the active board.

Workstation layout with instruments at fablab — Setup photo C - Workstation arrangement with shared instrument access.

2) Device under test (DUT)

Item	Description
Main board	Custom purple PCB with ESP32-WROOM class controller, display, buttons, and LED indicators.
Power	USB-powered during testing; auxiliary bench modules were visible in the setup area.
Goal	Validate DC rails with DMM and capture representative live waveform with DSO.

3) Multimeter checks (DT-860B)

We used DC voltage mode and selected a range suitable for around 5 V nodes. Measurement was taken in parallel between target rail and GND. Before circuit probing, we performed a quick probe-contact check to verify leads and meter response.

Multimeter reading near five volts — Measurement photo A - DMM reading used to confirm expected DC rail level.

Multimeter probe short-check indication — Measurement photo B - Probe-tip check performed before board-side measurement.

4) Oscilloscope capture (OWON EDS102CV)

Ground clip was fixed to circuit GND and probe lead was kept short to reduce ringing. After tuning volts/div, time/div, and trigger level, we captured a stable signal trace and saved the display result.

Scope probe on purple PCB test point — Scope photo A - Probe-tip and ground placement on the DUT.

Full oscilloscope setup with ESP32 board and USB power — Scope photo B - Full bench view of DUT, USB power, and scope connection.

Oscilloscope display with captured waveform — Scope photo C - Final stabilized waveform capture for report evidence.

5) Extra instrument notes

Bench supply and soldering equipment were available during this session. A separate logic analyzer run was not included in the Week 6 group record.