Aon posted pictures of the boards he ordered from DirtyPCBs in the project log forum: Just received these boards I ordered from dirtypcbs.com two weeks ago. Came with complimentary tweezers and all :D Also received a USB microscope today, so here’s a close-up of a SOT-363 package and some 6 mil traces. The silkscreen seems to be […]
Author Archives: DP
PIR sensor
An automatic PIR sensor project by Rajkumar Sharma of Electronics Lab: Project is based on Holteks IC HT7610A, which is a CMOS LSI chip designed for use in automatic PIR lamp, flash or buzzer control. It can operate in 3-wire configuration for relay applications. In our project we have used relay instead of Traic to connect any […]
Reverse engineering a NAND flash device management algorithm
Joshua Wise writes: The following is a description of how I went about reverse-engineering the on-flash format, and of the conclusions that I came to. My efforts over the course of about a month and a half of solid work – and a “long tail” of another five months or so – resulted in a […]
Bus Pirate v4 back in stock
Bus Pirate v4 is back in stock at Seeed Studio. The Bus Pirate is an open source hacker multi-tool that talks to electronic stuff. It’s got a bunch of features an intrepid hacker might need to prototype their next project. You can get a Bus Pirate v4 for $40, including worldwide shipping.
Wireless ADC to relay example
Ondřej Karas of DoItWireless writes: Sometimes, you need to measure analog signal and then switch something on or off according to the result. This short example shows, how to do it. Everything you need is DDC-SE-01 module as a sensor module and DDC-RE-01 as relay module. Of course you need DK-EVAL-04 or CK-USB-04 for both of […]
Aperture scripting: Panelize and manipulate Gerber files
Doub has announced the release of the Aperture scripting, a set of Lua libraries to manipulate PCB data files. He writes: At the core of my Gerber Viewer (that you’ve made quite popular, thank you all), there’s always been a set of Lua libraries to load the Gerber and Excellon files, and I’ve privately […]
DIY binary wrist watch
Elia wrote an article detailing his binary wrist watch project: I have just finished my binary wrist watch project (well, the new revision anyway). I was surprised at how small I was able to make it compared to last time. I chose to go with the “super-yellow” color LEDs as they fit the purple OSHpark PCB very […]
Implementing an all digital phase-locked loop
Kalle Hyvönen of DGKelectronics writes: I’m currently building an induction heater. I’ve already built one controller based on an analog PLL so this time I decided to go all digital and use an ARM Cortex-M4 microcontroller (STM32F303). For this I needed to implement a digital phase-locked loop running on the MCU. Principle An ADPLL is […]
A Haskell interface to the Bus Pirate binary interface
Ben Gamari writes, “This package provides a simple, type-safe interface for working with the Bus Pirate’s binary interface.” Get your own handy Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.
DIY shake LED Stick
Kathy over at ElecFreaks shares his DIY shake LED stick in the project log forum: The principle of shake LED stick is based on that people have persistence of visual senses. When you light up a column LED at different moments in different ways, shake it, and a very beautiful picture will display before your eyes. […]
ATmega based pool cleaner robot
Here’s a pool cleaner robot built on ATmega by Davide Gironi: My replacement electronics it is based on ATmega8 micros. The project is divided into two parts: timer cleaning robot The timer contains the 220 AC to low voltage DC current, and it is out of water, his purpose is to start and stop the cleaning pool robot, […]
#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 […]
SparkysWidgets: Hakko demo and giveaway
@SparkysWidgets tweted, “Latest video is up where I giveaway @HakkoUSA FX-888D @sparkfun swag and a @dangerousproto Bus Pirate” This is just a short demonstration video where I set the parameters on a FX-888D and then solder some SMD parts and show how one can create other types of soldering jobs! This is also the video […]
Op-Amp based linear regulators
Warren Young of Tangentsoft writes: Experienced audio DIYers are familiar with monolithic linear regulators like the 78xx series and the LM317. Here’s a simplified block diagram of a standard linear regulator, from National Semiconductor’s Application Note 1148 Let’s see… We have an op-amp, a couple of transistors, a voltage reference, and a few resistors. Can we […]
Audio: Headphone “Anti thump” delayed output rev 1.1
Rupert Hirst writes: A long awaited refresh, to my previous “Anti Thump” headphone output delay circuit, designed back in 2011. The Idea behind the circuit is to introduce a small delay, during initial power up, to electrically isolate and protect equipment connected directly to an amplifier. Often, during power up, amplifiers can produce an audible […]
DIY stroboscope
ReturnZero published a stroboscope build: At its heart, a stroboscope is just a rectangular wave generator hooked up to a light source. I wanted a few extra features to make it nice to use: Ability to set flash rate by either frequency or RPM Set duty cycle of output without affecting flash rate LCD display […]
2014 Open Hardware Summit Rome, Italy
OSHWA recently opened registrations for the Open Hardware Summit 2014! The Summit is Free for all and will happen in Rome in the same week of the Maker Faire: The 2014 Open Hardware Summit will take place on September 30, 2014 and October 1, 2014 at the Rome Auditorium. This annual conference is organized by […]
Tiny waveform generator
herpderp shares his waveform generator in the project log forum: Here is my last project, a tiny waveform generator based on my previous project and some components: – An AD9834 (DDS chip with sinus/triangle output) – 2 x AD5310 (10bit DAC: one for the Vpp control, another one the offset control) – 3 x LM7171 (Fast […]
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: Complex power supply sequencing made easy
Power sequencing from Analog Devices using their ADP5134 sequencer IC. App note here (PDF) Power supply sequencing is required for microcontrollers, field programmable gate arrays (FPGAs), digital signal processors(DSPs), analog-to-digital converters (ADCs), and other devices that operate from multiple voltage rails. These applications typically require that the core and analog blocks be powered up before […]