ProjectLog - esorensen.com

ProjectLog

A collection of 13 posts

Denmark: Amplifier Module

Denmark: Amplifier Module

This post summarizes the build of an ICEpower-based 3-channel amplifier with DSP crossovers.

Coffee Roaster Controller Intro

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Coffee Roaster Controller Intro

In this post I will document the build of my air popper controller to roast quality coffee. I am providing enough detail that someone interested should be able to replicate the project. If you are working on building your own and run into any issues please reach out!

User Interface and Firmware

User Interface and Firmware

This page gives a high level overview of the user interface design of the coffee roaster. I discuss the management of responsibilities between the Nextion display and the Arduino controller and summarize the UI elements.

Building the Control Board

Building the Control Board

This pages summarizes the bill-of-materials and schematic for the coffee roasting controller. Wiring up the controller is pretty straightforward and follows directly from the schematic.

Modifying the Air Popper

Modifying the Air Popper

This page shows the process of modifying a Poppery II popcorn popper so that the motor and heater coils can be operated independently of each other. During the modification a thermistor is added to monitor the temperature of the coils and a thermocouple to monitor the chamber temperature.

Bookshelf Speakers + Mini Subwoofer

Bookshelf Speakers + Mini Subwoofer

This is a build log for a custom set of speakers I built for a friend. I made a subwoofer similar to the "Voxel" design from Paul Carmody. I made it slightly larger, increased the port diameter, tuned slightly lower, and added a Lepai plate amplifier. I am

Home Antenna Grounding

Home Antenna Grounding

I recently installed an end-fed wire antenna running from the apex of my garage into a large maple tree in my backyard. I want to get the best performance I can from the antenna and also take the appropriate precautions to operate safely and protect my equipment.

MiSTer Case

I've recently been interested in FPGA-based gaming systems. These systems implement the hardware of gaming systems on a programmable FPGA to achieve very accurate "hardware emulation" of the platform. A recent popular example is the Analogue Pocket, which is an FPGA-based handheld gaming system which can

Loop Antenna Copper Jumpers

Loop Antenna Copper Jumpers

I am planning to machine some copper jumpers to go between the copper loop and the vacuum capacitor. These can be soldered (or brazed) to create a solid connection with very low resistance.

LCD Control Board for SX3 Mill

LCD Control Board for SX3 Mill

The LittleMachineShop control board replaces the button board built in to the mill, so when the spindle control board is connected the buttons and LCD built in to the mill are no longer functional. I designed a drop-in replacement for the button board to help add back some functionality.

Shopfox M1111 Mill Conversion - Intro

Shopfox M1111 Mill Conversion - Intro

In 2017 I acquired a Shopfox M1111 benchtop mill. It has an intermittent issue with the spindle motor, but is otherwise mechanically sound. This mill is very similar to the Grizzly X3 mills and is suitable for light-duty milling in aluminum. Leadscrews These mills are commonly converted to CNC machines

4PI Speaker Build

4PI Speaker Build

This is a build log for my 4PI speakers. These high-efficiency speakers have a 15" woofer and a horn-loaded tweeter.

Robotic Arm - Part 2 - Assembly

Robotic Arm - Part 2 - Assembly

In part 1, I shared some of my notes about the BOM for the Moveo robotic arm. In this article I'll share some pictures of the assembly. All of the plastic parts on the Moveo are 3d-printable. I experimented with and without support material and found the parts