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A Raspberry Pi Pico Controlled Frequency Shift Audio Oscillator:  A Radio Shack Classics Circuit Remix

A PIR sensor detects objects to allow a Raspberry Pi Pico running MicroPython code to adjust the frequency of a Science Fair electronic oscillator circuit with audio output.

one day ago by Don Wilcher

Building a One-Shot Multivibrator with an ESP32 Terminal Display:  A Radio Shack Classics Circuit Remix

In this hands-on project, we will update a 1980s version of a one-shot (monostable multivibrator) circuit by giving it a modern, colorful output while also examining the circuit's operation.

September 17, 2023 by Don Wilcher

Creating a DCO-based Audio Synthesizer With an Arduino Nano

In this project, learn to create a digitally-controlled oscillator or DCO-based audio synthesizer with an Arduino Nano or an Arduino Uno.

April 09, 2023 by Darby Hewitt

How to Build Your Own Function Generator Using Analog Devices’ AD9833

Tired of using your PC or mobile phone as a signal generator? It’s time to upgrade to a standalone one by making it yourself.

January 17, 2018 by Cezar Chirila

High-Speed Waveform Generation with an MCU and a DAC

In this article, we’ll evaluate different firmware strategies in our pursuit of maximum-frequency analog signal generation.

December 08, 2017 by Robert Keim

How to Generate a High-Precision Waveform Using a DAC and a Custom PCB

In this article, we’ll develop firmware that will serve as the basis for high-precision, high-speed signal generation.

December 01, 2017 by Robert Keim

Incorporating Microphone Functionality into a Robot System

In this article, we’ll look at a fairly straightforward circuit that enables a robot or other device to detect sound.

September 11, 2017 by Robert Keim

Learn About ATmega328P Fuse Bits and How to Use Them with an External Crystal Oscillator

This project introduces ATmega328P fuse bits and shows how to set them to use an external 16 MHz crystal oscillator.

August 03, 2017 by Charles R. Hampton

The Holiday Season Analog Alarm! A Gift-Defending System

Nowhere to hide presents this holiday season? No problem! This alarm will sound anytime a loved one tries to get a sneak peek at his or her surprise.

December 05, 2016 by Ryan Jones

Build Your Own Metal Detector with an Arduino

Building a metal detector using a Colpitts oscillator and an Arduino.

October 03, 2016 by Evan Kale

DIY Synth Series Part 1 — The Exponential VCO

Build a 1V octave voltage-controlled oscillator (VCO) module and create your own analogue synth sounds.

August 08, 2016 by Robin Mitchell

Digital-to-Analog Conversion with the SAM4S Peripheral DMA Controller

Part Three in this three-article series shows you how to generate values for a discrete sinusoid and continuously convert this data into an analog signal without overburdening the CPU.

May 09, 2016 by Robert Keim

Understanding and Using the SAM4S Digital-to-Analog Converter

Part Two in this three-article series explores the SAM4S DAC. We’ll look at hardware configuration, electrical characteristics, and the application programming interface.

May 04, 2016 by Robert Keim

DMA Digital-to-Analog Conversion with a SAM4S Microcontroller: The Timer/Counter

Part One in this three-article series focuses on using the SAM4S timer/counter peripheral to precisely control the DAC’s sampling rate.

April 28, 2016 by Robert Keim

PWM Digital-to-Analog Conversion with the SAM4S Xplained Pro

In this article we’ll use the SAM4S Xplained Pro development platform to get some hands-on experience with a PWM DAC.

April 19, 2016 by Robert Keim

Embedded PID Temperature Control, Part 1: The Circuit

Invoke the power of the PID (proportional–integral–derivative controller)! The key components in this design are an EFM8 microcontroller, a DAC, and the MAX31855 thermocouple-to-digital converter.

February 01, 2016 by Robert Keim

EFM8 Sound Synthesizer: Driving the Speaker

Part 2 in the “How to Make an EFM8-Based Sound Synthesizer” series.

September 11, 2015 by Robert Keim

Ambient Light Monitor: Zero-Cross Detection

Part 4 in the “How to Make an Ambient Light Monitor” series

August 16, 2015 by Robert Keim

Ambient Light Monitor: Understanding and Implementing the ADC

Part 2 in the "How to Make an Ambient Light Monitor" Series. Our smart ambient light monitor will need to digitize and analyze signals from an optical detector, so it is time to explore the EFM8’s integrated analog-to-digital conversion functionality.

August 05, 2015 by Robert Keim

Introduction to Arduino SPI Library with LTC1286 and DAC714

Introduction to the Arduino SPI Library with example sketch for the LTC1286 12 Bit ADC and the DAC714 16 bit DAC.

July 17, 2015 by Aaron Dennis