Everything for Electronics
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Build the Graphing Thermometer

Recently, I began to explore ways to improve and upgrade my “thermal monitoring technology” and came up with this simple, easy to build trend-plotting thermometer. This project features a large color graphics display to show the current temperature in big bold digits. Better than that, it also graphs the temperature trends over the most recent 4, 8, 16, or 24 hour period. 

Whether it be temperature trends, time and date, current/voltage readings, battery status, or other variables, consider giving your next project some extra pizazz by including an LCD color graphics display into the design!

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Build the Laser Pencil Engraver

Several months ago, an idea popped into my head for a fun project. I wondered if I could burn some characters into the yellow paint of a No. 2 pencil with one of those powerful diode lasers available on eBay. Perhaps it could be my name or my grandkid’s names, or even a happy birthday message to my lovely wife. Here’s how I did it.

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Build a MIDI Autoharp

This project is a follow-on from my MIDI lyre project featured in the July-August magazine. I’m going to describe how to build a MIDI autoharp. Like the lyre, this is a MIDI controller, so it doesn’t make any sounds itself. Instead, it sends MIDI messages to an external synthesizer. It’s the synthesizer that makes the sounds.

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Build A MIDI Lyre

When you think of MIDI controllers, you probably think of a keyboard. However, there are many reasons to have MIDI controllers in other form factors (guitars, saxophones, flute/clarinets, and even trumpets for example), not the least of which is fun! In this article, we will make a MIDI lyre version. Also, the techniques presented here will allow you to create your own touch sensitive MIDI controllers in any form factor you can imagine.

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The Arduino Graphics Interface — Part 1

Turn an Arduino Due and a leftover analog oscilloscope into a high resolution computer graphics display and gain valuable insights into computer graphics, digital-to-analog conversion (ADC), and advanced Direct Memory Access (DMA) hardware and software techniques.

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Arduino PID Temperature Control

The “magic” of Proportional Integral Derivative (PID) process control can be mystifying. In this article, we’ll step you through using an Arduino in a hands-on exercise using a solid-state relay to control a 1,500 watt hotplate in a real world solution to a tricky problem: automating a vegetable canning process.

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Meet the ESP8266

It’s not all that often that a new piece of hardware comes along that immediately captures the attention of the builder community. The ESP8266 is the newest example of this. It’s only about the size of a nickel, yet contains a powerful 32-bit microcontroller and a Wi-Fi interface, plus you can buy it for around $4.

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