Everything for Electronics
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Build a 3D Printer Filament Scale

One thing you want to check before you start a long 3D print job is to verify you have enough filament on the spool to complete the print. You don’t want to come back to your printer at the end of a two-day run (as I have!) only to discover that the machine ran out of filament and the top part of the object is missing! This project describes a dedicated “spool scale” that provides a real time readout via an Arduino of just how much material you have left.

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Four-Position HF Antenna Switch with PC Control

Meet the SW-4U: A four-position ham radio antenna switch with PC control via a USB connection. The switch is controlled by an application program running on the PC that allows you to select any of four antennas, ground all for safety, and to power the switch on and off.

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Restoring the Heathkit ES-400 Computer

It took me eight months of part-time work to restore all 168 pounds of a Heathkit “H-1.” I would like to share a few of the trials and tribulations I went through to resurrect this beast.

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Build a Pocket-Sized Altair Computer

In the beginning, computers were very large and took up a lot of space. These days, single-board computers have gotten quite small. So, could an older Intel 8080 compatible computer be built to today’s smaller size standards? Why yes! It can!

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MakerPlot – The DIY Software Kit

If you use microcontrollers in your projects, imagine how helpful it would be to see the data in a graphical format, rather than just a series of numbers -- especially when debugging! MakerPlot does all of this and connects directly to your microcontroller’s serial port to display analog and digital data in graphical form; it’s DIY software for your microcontroller projects.

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An ESP32 / Teensy 3.5 Super Clock

After creating an Internet connected digital clock using the Adafruit RA8875 driving an seven inch LCD display, I decided to step it up a notch and add several additional features including: the ability to set an alarm; a countdown timer for uses like monitoring an exercise program; a weather display to provide brief conditions at 10 different cities; a real time stock market report that gives the changing prices for a selection of stocks; and lastly (just for fun), a Mandelbrot fractal generator to produce those wonderful images.

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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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