embedded - esorensen.com

embedded

A collection of 9 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.

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.

Loop Antenna - Initializing the TMC2130

Loop Antenna - Initializing the TMC2130

Continued from part 4. Now that I can read and write across the SPI interface I am going to write an initialization routine for the TMC2130. Fig 22.1 and 22.2 in the TMC2130 datasheet show a "quickstart" routine for the TMC2130. First, here is 22.1: At "SC2"

Loop Antenna - SPI Read and Write

Loop Antenna - SPI Read and Write

Continued from part 3. Now that I have confirmed the stepper driver is working properly, I want to establish SPI communication for configuration and status readback. This will be especially important to enable the stall detection feature I am using for homing. First, I wrote a function to read and

DDS RF Signal Source

DDS RF Signal Source

In 2017 I designed a local oscillator board which can be used to generate an RF signal in the HF range (< 30MHz). I hope that this can become the building block for a more complete radio design, so I included a lot of expansion options including an I2S interface, I2C,