An update on Edward Mallon’s Arduino data logger project we covered previously: If you need a logger with a cheap durable housing, it’s still hard to beat the Dupont-jumper build released in 2016. But sometimes I need more of a bare-bones unit for bookshelf test runs while I shake down a new sensor. I can […]
Author Archives: DP
Free PCB Sunday: Pick your PCB
We go through a lot of prototype PCBs, and end up with lots of extras that we’ll never use. Every Sunday we give away a few PCBs from one of our past or future projects, or a related prototype. Our PCBs are made through Seeed Studio’s Fusion board service. This week two random commenters will […]
App note: How to measure thermal resistance of LED emitters and LED arrays
Another white paper from Lumileds about LED thermal resistance. Link here (PDF) Thermal performance is the most critical factor of a well-designed LED lighting system. A lighting system with proper thermal design has higher efficacy, meaning more light can be extracted using less energy, and better long term reliability.
App note: Flash for “Selfies”
Effective front facing camera flash discussed in this white paper from Lumileds. Link here (PDF) Smartphones are ubiquitous in everybody’s daily lives, a trend that shows no sign of slowing. A key component of the smartphone is the camera, which has gained market share over Digital Still Cameras due to its convenience. As the demand […]
Free PCB coupon via Facebook to 2 random commenters
Every Friday we give away some extra PCBs via Facebook. This post was announced on Facebook, and on Monday we’ll send coupon codes to two random commenters. The coupon code usually go to Facebook ‘Other’ Messages Folder . More PCBs via Twitter on Tuesday and the blog every Sunday. Don’t forget there’s free PCBs three […]
DIY robot design
A computational abstractions for interactive design of robotic devices by Ruta Desai, Ye Yuan and Stelian Coros from Carnegie Mellon University’s Robotics Institute: We present a computational design system that allows novices and experts alike to easily create custom robotic devices. The core of our work consists of a design abstraction that models the way […]
Display Arduino analog input using LabVIEW
Zx Lee shared detailed instructions of how to display the Arduino measurements using LabVIEW: To get started, I will explain what is actually going on in Arduino. In this project, I am using an Arduino Nano to acquire signals and send the data to PC. As mentioned earlier, two analog input channels (A0 & A1) […]
#FreePCB via Twitter to 2 random RTs
Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week: Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch […]
Raspberry Pi soft power controller – the circuit
James Lewis has been working on a Raspberry Pi soft power controller, that is available on github: The RetroPie project enables retro-gaming with a Raspberry Pi. All of the 카지노 사이트 Pi models have enough computing power to emulate the major 8-bit and 16-bit computers of the 80s and 90s. With the Pi 3 I […]
Free PCB Sunday: Pick your PCB
We go through a lot of prototype PCBs, and end up with lots of extras that we’ll never use. Every Sunday we give away a few PCBs from one of our past or future projects, or a related prototype. Our PCBs are made through Seeed Studio’s Fusion board service. This week two random commenters will […]
App note: DAC ICs: How many bits is enough?
A very old application notes from Analog Devices that tells about Nyquist Theorem, sampling rate and quantization used on DACs. Link here (PDF) At the heart of every digital audio playback system lies the single-most critical component for high-fidelity audio: the digital-to-analog converter (DAC). These converters handle the delicate task of translating the 16-bit binary […]
App note: Influence of control loop by an output filter
Application note from Würth Elektronik about the effect of filters that are added to the output of switching regulators. Link here The output voltage of switching regulators has a voltage ripple that can disturb with electrical power supplied circuits and lead to electromagnetic disturbances. Thus output filters are often used for noise suppression, which may […]
Free PCB coupon via Facebook to 2 random commenters
Every Friday we give away some extra PCBs via Facebook. This post was announced on Facebook, and on Monday we’ll send coupon codes to two random commenters. The coupon code usually go to Facebook ‘Other’ Messages Folder . More PCBs via Twitter on Tuesday and the blog every Sunday. Don’t forget there’s free PCBs three […]
Adjustable gain LNA
Mare published a new build: Low noise amplifiers are very useful. I built one with single BFG425W transistor with adjustable bias current. Project info at Mare & Gal Electronics homepage.
Using Python to store data from many BLE devices
Erich Styger has written an article describing a technique he used to collect and store data from several BLE devices with Raspberry Pi and Python scripting: BLE (Bluetooth Low Energy) sensor devices like the Hexiwear are great, but they cannot store a large amount of data. For a research project I have to collect data […]
#FreePCB via Twitter to 2 random RTs
Every Tuesday we give away two coupons for the free PCB drawer via Twitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week: Hate Twitter and Facebook? Free PCB Sunday is the classic PCB giveaway. Catch […]
SmallyMouse2 – Universal USB to quadrature mouse adapter
Designed and built by Simon Inns, a universal USB to quadrature mouse adapter project – SmallyMouse2: SmallyMouse2 is a universal USB to quadrature mouse adapter for many 8-bit and 16-bit retro computers and allows the use of modern USB mice on machines such as the Acorn BBC Micro, Acorn Master, Acorn Archimedes, Commodore Amiga, Atari ST […]
Switching off SD cards for low power data logging
Edward Mallon writes: I saved SD power control to the end of my quest for low power logging, because of all the potential weirdness that could arise with the Arduino libraries. But after a reasonably thorough round of testing it all seems to be working OK with a BJT switching the ground line. More details […]
Free PCB Sunday: Pick your PCB
We go through a lot of prototype PCBs, and end up with lots of extras that we’ll never use. Every Sunday we give away a few PCBs from one of our past or future projects, or a related prototype. Our PCBs are made through Seeed Studio’s Fusion board service. This week two random commenters will […]
App note: Ceramic multilayer capacitors in HF SMPS applications
Development and improvement of ceramic multilayer capacitors in high frequency power supply filtering, a technical note from AVX. Link here (PDF) There has been an explosion of interest in the use of ceramic capacitors for high frequency power conversion applications. This interest is compounded with new designs striving for higher frequencies, smaller sizes and greater […]