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Building a Capacitive Touch Interface with the Texas Instruments MSP430FR2633

Building a Capacitive Touch Interface with the Texas Instruments MSP430FR2633

The MSP430FR2633 is a low-power microcontroller with multiple GPIOs and capacitive touch pins. This project creates a circuit that supports a custom capacitive touch panel with LED and haptic feedback.


Projects Jan 12, 2018 by Mark Hughes
An Op-Amp Limiter: How to Limit the Amplitude of Amplified Signals

An Op-Amp Limiter: How to Limit the Amplitude of Amplified Signals

This article, part of AAC’s Analog Circuit Collection, explores the design and functionality of an op-amp-based limiter.


Simplifying VHDL Code: The Std_Logic_Vector Data Type

Simplifying VHDL Code: The Std_Logic_Vector Data Type

This article will review the "std_logic_vector" data type which is one of the most common data types in VHDL.


How to Multiply RF Signals without a Multiplier: The Switching Mixer

How to Multiply RF Signals without a Multiplier: The Switching Mixer

This article introduces an important technique used to perform frequency mixing in modern RF circuits.


Concurrent Conditional and Selected Signal Assignment in VHDL

Concurrent Conditional and Selected Signal Assignment in VHDL

This article will review the concurrent signal assignment statements in VHDL.


What Is VHDL? Getting Started with Hardware Description Language for Digital Circuit Design

What Is VHDL? Getting Started with Hardware Description Language for Digital Circuit Design

This article gives some introductory examples for VHDL coding, a hardware description language used in digital circuit design.


GPS Times, Atomic Clock Frequencies, and the Increasing Accuracy of GPS

GPS Times, Atomic Clock Frequencies, and the Increasing Accuracy of GPS

GPS as we know it requires the precision of atomic clocks. This article looks at the importance of timing for GPS and the clocks that provide it.


Multiplication Examples Using the Fixed-Point Representation

Multiplication Examples Using the Fixed-Point Representation

This article will discuss several multiplication examples using the fixed-point representation.


The FitByte: How to Make an ATtiny85 Powered Activity Tracking Wearable

The FitByte: How to Make an ATtiny85 Powered Activity Tracking Wearable

This is a protoype of a fitness wearable device designed to vibrate when it detects stagnation.


Projects Dec 13, 2017 by Demsey Kirkwood
High-Speed Waveform Generation with an MCU and a DAC

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.


Projects Dec 08, 2017 by Robert Keim
Pixel Intensity Histogram Characteristics: Basics of Image Processing and Machine Vision

Pixel Intensity Histogram Characteristics: Basics of Image Processing and Machine Vision

This article introduces the image histogram and discusses its characteristics and applications.


The Polyphase Implementation of Interpolation Filters in Digital Signal Processing

The Polyphase Implementation of Interpolation Filters in Digital Signal Processing

This article discusses an efficient implementation of the interpolation filters called the polyphase implementation.


Handling Fragile and Irregular PCBs in Processing and Testing Machines

Handling Fragile and Irregular PCBs in Processing and Testing Machines

Manufacturers can use fixtures or panels to secure or frame fragile, thin, or oddly shaped PCBs. This allows them to easily fit the boards in the standard assembly or inspection machines.


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

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.


Projects Dec 01, 2017 by Robert Keim
Fixed-Point Representation: The Q Format and Addition Examples

Fixed-Point Representation: The Q Format and Addition Examples

Fixed-point representation allows us to use fractional numbers on low-cost integer hardware.


How to Check and Calibrate a Humidity Sensor

How to Check and Calibrate a Humidity Sensor

How accurate is your humidity sensor? Find out with this project.


Power Hold-Up and Energy Storage Management Devices

Power Hold-Up and Energy Storage Management Devices

In this article, we discuss power hold-up and some energy storage management devices in the context of SSDs.


PCB Layout for an Arbitrary Waveform Generator

PCB Layout for an Arbitrary Waveform Generator

In this article we’ll discuss the PCB layout for a custom-designed arbitrary waveform generator board.


Two’s Complement Representation: Theory and Examples

Two’s Complement Representation: Theory and Examples

This article will review the theory of the two’s complement representation along with some examples.


Circular Buffer: A Critical Element of Digital Signal Processors

Circular Buffer: A Critical Element of Digital Signal Processors

This article discusses circular buffering, which allows us to significantly accelerate the data transfer in a real-time system.