Perfboard

Perfboard is a material for prototyping electronic circuits (also called DOT PCB). It is a thin, rigid sheet with holes pre-drilled at standard intervals across a grid, usually a square grid of 0.1 inches (2.54 mm) spacing. These holes are ringed by round or square copper pads, though bare boards are also available. Inexpensive perfboard may have pads on only one side of the board, while better quality perfboard can have pads on both sides (plate-through holes). Since each pad is electrically isolated, the builder makes all connections with either wire wrap or miniature point to point wiring techniques. Discrete components are soldered to the prototype board such as resistors, capacitors, and integrated circuits. The substrate is typically made of paper laminated with phenolic resin (such as FR-2) or a fiberglass-reinforced epoxy laminate (FR-4).

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A Spigot That Streams Digits of Pi

“There are several methods for calculating the value of Pi. One approach that was devised by mathematicians (Gibbons, Rabinowitz, and Wagon) generates the digits iteratively one after the other using what is called a spigot algorithm. There are a number …

Analog Knobs on Raspberry Pi 400 with CYBERDECK Hat

“Raspberry Pi single board computers are wonderful devices. They can do so many things, including interact with sensors, inputs, and outputs with their GPIO (general purpose Input/Output) pins — however, analog input and output are not available on the stock …

Frequency Counter With Variable Gate Time

“Frequency counter (reciprocal) Gate time selectable from 0.1 second up to 60 seconds Frequency range from 0.1 Hz up to 10 MHz (tested) Input 3.3V and 5V safe Uses a STM32F103C8 (Blue Pill) and 16x4 LCD Supplies …

Serial Monitor With ILI9341 and BluePill

“Serial (ascii) monitor with 9 lines of 28 char. Baudrate from 2400 up to 256000 baud. Digital 3.3V or 5V input. Powered by a single Lithium-Ion battery. (3.7V nominal) Supplies: ILI9341 display (here a parallel version is used …

Bathroom Ventilation Fan Controller

“Now a few weeks in test and performing so well… ! An Arduino controller to very effectively keep the humidity to an acceptable level. WHY (oh why…?) Well I looked for a good solution to keep the humidity level down in …

Dual Cores & Interrupts on Pi Pico

“The new Raspberry Pi Pico offers Dual Cores and Interrupts if you use MicroPython. I thought I would give it a go and try explain some of the pitfalls to avoid. This project keeps the action running on the two …

How to Make an AC Softstarter

“In this project I will show you why my new autotransformer keeps tripping my circuit breaker and how I built an AC softstarter in order to “softly” start the transformer so that it does not trip my circuit breaker. Along …

Illuminated Cubes

“This project is a follow up of the Illuminated Presents project that I posted earlier. My wife really liked the Illuminated Presents but kept them as Cubes and did not put a bow around it to turn them into presents …

STOP Face Touching Device

“Why do you want to stop touching since it is part of our human nature? Well, it is all because of the virus floating around. Health officials keep telling the public to stop touching faces when they couldn’t help …

Adjustable High DC Voltage Generator

“This project is about building an adjustable high voltage generator (DC) from a low DC voltage supply. The voltage supply can range from 5V to over 25V (I use a 9V supply). Higher voltages can require heat dissipators attached to …