Laser arm

Facelesstech published a new build: So some time last year I ordered one of those servo 2 axes (pan and tilt torret) arm kits from aliexpress. It was fun to play with but I didn’t quite find a reason to use it in a project. Then I seen this project on hackaday and a light bulb went off […]

Arduino controlled Dual Mono AK4490 DAC (part 3)

Here’s the part 3 of Dimitris’ Arduino controlled Dual Mono AK4490 DAC project we covered previously: Following up on Part 2, it’s time to talk about the output stage. This output stage is the brainchild of my friend Kostas, all I did was lay out the PCB. It is a fully discreet single-ended class-A output stage, […]

TWANG, an Arduino-based dungeon crawler

Bdring built his own Arduino-based 1D dungeon crawler inspired by Robin Baumgarten’s  Line Wobbler: I have been a Patron of Robin Baumgarten for a while. He makes experimental hardware for games. His Line Wobbler one dimensional dungeon crawler is my favorite and I have always wanted to play it. It uses a door stop spring […]

Yield function, printable class and mapping arrays: Useful but unknown features from Arduino core

Yahya Tawil over at Atadiat wrote a new tip for Arduino developers about three hidden and useful features in Arduino core: Arduino core, the source code of Arduino API functions and classes, has three useful features that can be used effectively. As the Arduino core documentation doesn’t mention them (at least until the time of publishing […]

Arduino Tutorial: Adding sensors to your data logger

Edward Mallon writes: This post isn’t another How-To tutorial for a specific sensor because the Arduino community has already produced a considerable number of resources like that.  You’d be hard pressed to find any sensor in the DIY market that doesn’t give you a dozen cookbook recipes to follow after a simple Google search. In […]

Arduino controlled Dual Mono AK4490 DAC (part 2)

An update on Arduino controlled Dual Mono AK4490 DAC project we covered previously: After I was certain that everything related to the software was working the way it should, I designed a “motherboard” that would take care of the following: Accept the STM32F106 board Accept the 3.5″ TFT Accommodate an 24LC256 EEPROM chip, used to […]

Weather logger with Losant and Amazon Alexa

Steve documented his experience experimenting with home weather logging: Like a million other people on the Internet, I’ve been experimenting with home weather logging. I roll my eyes at the phrase “Internet of Things”, but it’s hard to deny the potential of cheap networked sensors and switches, and a weather logging system is like this […]

How to configure I2C sensors with Arduino

Edward Mallon writes: I’ve spent the last year in the ‘uncanny valley’ of the Arduino. That’s the point where you understand the tutorials at Arduino.cc, but still don’t get much from the material on gitHub because trained programmers would never stoop to using the wire.h library when they could just roll their own in native […]

Pulse Oximeter functionality for a medical device

Alexander Lang writes: The gentlemen for whom I’m developing this hardware for has requested some additional functionality. The additional functionality requested is a Pulse Oximetry measurement.  Pulse Oximetry is the measurement of a person’s pulse along with how much oxygen is present within their blood.  It is a common measurement made by medical practitioners to […]

Solid-state joystick

Paul Gardner-Stephen writes: Early in the year, one of my colleagues, Damian, showed me one of these strain-gauge solid-state joysticks that they were using as part of the undergraduate engineering curriculum. Their goal was to teach the students how to read strain-gauges. But I immediately saw the applicability for making a no-moving-parts super-robust joystick for […]

Build your very own drink mixing robot

Yu Jiang Tham designed and built his own bartender robot named Bar Mixvah, that is available on Github: I built a robot that mixes drinks named Bar Mixvah.  It utilizes an Arduino microcontroller switching a series of pumps via transistors on the physical layer, and the MEAN stack (MongoDB, Express.js, Angular.js, Node.js) and jQuery for the […]

Calibrating Thermistors on a 3.3v Arduino

Edward Mallon writes, “I’ve managed to get cheap thermistors calibrated to about to +/- 0.2C with 3.3v Arduinos. Instead of playing whack-a-mole with the various sources of error, I simply rolled them into some synthetic Steinheart-Hart constants, and I was able to get the therm’s output onto the reference line from a si7051. The cool […]

Lift: Millimeter-level finger tracking with Arduino and light sensors

Researchers at the UC Irvine and the FX Palo Alto Laboratory present Lift, a visible light-enabled finger tracking: By projecting encoded visible patterns onto an object’s surface (e.g. paper, display, or table), and localizing the user’s fingers with light sensors, Lift offers users a richer interactive space than the device’s existing interfaces. Additionally, everyday objects […]