PCB on Jannett Wehle

Ferris Cosmic

Thu, 27 Feb 2025 00:00:00 +0000

The “Ferris Cosmic” is a branch off of the Ferris Sweep 2.1 keyboard design, with custom graphics and minor aesthetic changes.

My github repository for hardware design of the project is done in KiCAD and is located here: https://github.com/JWehle/ferris-cosmic

The github repository for the firmware is done using ZMK and is modified by Kendra Plante (https://github.com/kp9001) for a custom keys layout, located here: https://github.com/kp9001/ferris-zmk

(Image) Fully assembled Ferris Cosmic keyboard

(Image) In the process of soldering keyboard

Multimeter Direct to Keyboard Strokes

Thu, 09 Jan 2025 00:00:00 +0000

Project page for a multimeter output reader that translates an Amprobe 38XR-A multimeter’s output to keyboard strokes for quick and less error prone logging of data without a human typing in the loop.

(Image) Multimeter connected to PCB.

Room Temperature and Humidity Monitor

Thu, 09 Jan 2025 00:00:00 +0000

Project page for the temperature and humidity monitor board for monitoring individual rooms in a building.

(Image) Assembled board

(Image) Screenshot of output terminal

Upscaled Washington DC Metro System Map PCB

Thu, 09 Jan 2025 00:00:00 +0000

Project page for the upscaled 1.5X DC Metro PCB.

The original starting point for this project is the DC Transistor project by Logan Arkema: https://dctransistor.com/

I took this original design and scaled it up by 1.5X. The original dimensions of the 12 inches by 12 inches, but I increased that to 18 inches by 18 inches and sized up all of the artwork to match this.

I also took the “Bidirectional” version of the DC Transistor project, which used two sets of smaller RGB LEDs to represent the trains’ directions at each station, and sized those LEDs up to the larger 5050 LEDs to fit the larger space available on the board. The layout around the ESP12 controller was reworked to accommodate for the larger board size, and an inrush limiting circuit was added so that some larger capacitors could be used on the 5V line that powers all 270 of the LEDs.

USB Host Switch

Thu, 09 Jan 2025 00:00:00 +0000

Project page for a USB host manual switch to connect two computers to the same keyboard and mouse peripherals.

(Image) Fully assembled into 3D printed case

Compact Sky Quality Meter

Sat, 21 Sep 2024 00:00:00 +0000

A compact sky quality meter (SQM) for measuring light pollution in the night sky.

(Image) Bare boards

(Image) Layout

(Image) 3D Model

LED Ring Light

Sat, 21 Sep 2024 00:00:00 +0000

Project page for a circular ring light of white LEDs. The goal of this project was to make an LED lighting fixture in custom sizes for lighting purposes, such as for a camera flash or lighting a lab bench. The circular shape makes the light emmitted circularly polarized to limit the linear polarization in a scene for photography purposes.

(Image) Bare board

(Image) Assembled board

Polaroid SX70 Auto Trigger

Sat, 21 Sep 2024 00:00:00 +0000

(Image) Polaroid remote trigger PCB with batteries.

Studio Quality Stereo Microphone

Sat, 21 Sep 2024 00:00:00 +0000

Buck Converter Test Board

Sat, 11 Nov 2023 00:00:00 +0000

Project page for a test board for a 3.3V buck converter.

This project uses a buck converter integrated circuit that integrates all the control components and the gate drivers into one part, but doesn’t include the buck converter MOSFETs allowing the designer to size the MOSFETs for the right currrent for the application. The part number is the RT8110BGJ8: https://www.richtek.com/assets/product_file/RT8110B/DS8110B-02.pdf

(Image) Bare Board

(Image) Assembled Board

(Image) Testing Converter at 12V input, 3.3V output, and 2.0A load current.

Solar Panel Curve Tracer

Thu, 02 Dec 2021 00:00:00 +0000

Project page for a current and voltage curve (IV curve) tracer for calibrating solar panels and finding their maximum power point (MPP) for maximum power point tracking (MPPT) algorithm development.

(Image) Bare board

(Image) Assembled board