I2C arbiter chip application(PDF) from NXP. The PCA9641 is highly integrated and smart design for 2-1 I2C-bus multiplexer. It is used in a system that needs two masters sharing the same slave devices. The internal switch is programmed by the masters but it will not switch in a middle of the task once owned by […]
Author Archives: DP
App note: Level shifting techniques in I2C-bus design
Level shifting techniques in I2C-bus design from NXP, app note here (PDF): Logic level shifting may be required when interfacing legacy devices with newer devices that use a smaller geometry process.For bidirectional bus systems like the I2C-bus, such a level shifter must also be bidirectional, without the need of a direction control signal. The simplest […]
App note: Using the USI module as a I2 C master
This application note (PDF) from Atmel describes the implementation of a TWI master: The Two-wire serial Interface (TWI) is compatible with Philips’ I2C protocol. The bus was developed to allow simple, robust and cost effective communication between integrated circuits in electronics. The strengths of the TWI bus includes the capability of addressing up to 128 devices […]
A script to dump an Atmel AT45DB041B 4Mbit SPI Flash part’s contents to disk using a Bus Pirate
@tyler_oderkirk tweeted, “wrote a tool to dump a AT45DB041B flash chip w/ python & Bus Pirate” Available on Github. Get an assembled Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.
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. More PCBs via Twitter on Tuesday and the blog every Sunday. Don’t forget there’s free PCBs three times every week: Free PCB Sunday. The classic. Every week, get […]
5W stereo audio amplifier
Another project from Rajkumar Sharma of Electronics Lab a 5W Stereo Audio amplifier based on BA5406: 5W Stereo Audio Amplifier project based on BA5406 IC which is suitable for application like stereo radio cassette player, stereo components systems etc. The Heart of the project, BA5406 is a dual OTL monolithic power IC with two built-in, […]
Week in (p)review October 31, 2014
Here’s a summary of major developments over the last week. Free PCB Friday is coming up soon. DIRTY TUESDAY: A bumpy road to streamlined service Hackers in Shenzhen: Pooya from Iran High voltage serial programming for AVR chips with the Bus Pirate DS3231 RTC control and theory with the Bus Pirate Bus Pirate v3.6 DIY […]
ArTICL: Arduino TI Calculator Linking Library
KermMartian over at Cemetech writes: The ArTICL library (pronounced “article”) lets Arduino programs send and receive TI link protocol-formatted packets at a low level. In addition, it includes a CBL2 class that lets the calculator emulate either a CBL2 device or a calculator speaking the CBL2 protocol (thanks to Cemetech member CVSoft for helping to make […]
DS3231 RTC control and theory with the Bus Pirate
@omwah tweeted, “Article I wrote on controlling the Maxim DS3231 RTC with the Bus Pirate” The Maxim DS3231 is an accurate, yet relatively expensive real time clock (RTC). It has an integrated temperature compensated crystal and communicates over I2C. Get an assembled Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.
Modification of the Lexmark E260 for direct laser printing of printed circuit boards – MCU version
mlerman writes: After trying several brands and models of laser printer, the printer I have settled on is the Lexmark E260. I use it because: 1 – It has an excellent Local Printer Utility that allows almost every printing parameter to be adjusted. 2 – It is readily and reasonably available on Ebay or Craig’s […]
Portable bluetooth-enabled scrolling LED matrix display
An open-source cascadable 8×8 LED matrix module using Arduino and MAX7219 from Embedded Lab: Easy Matrix is a cascadable 8×8 LED matrix module with the MAX7219 chip on board, which allows to control the display with only 3 I/O pins from microcontroller. Multiple Easy Matrix modules can be easily cascaded to make a bigger-size display through […]
Hackers in Shenzhen: Pooya from Iran
Pooya from Iran talks about his experience in Shenzhen, China. There’s more and more hackers visiting Shenzhen to check out the world’s largest electronics market and manufacturing ecosystem. This semi-regular series asks who they are and what they found.
A programmable power lamp shield based on Slenduino
Orlando Cosimo writes: A Programmable Power Lamp shield based on Slenduino…. not only a lamp. In this project we want to solve a typical problem that everyone can get when have to switch on-off an high power led. And, at the same time, to realise our project to work with our board, Slenduino.
Voice echo project
A voice echo module with build-in amplifier project by Rajkumar Sharma of Electronics Lab: A project has been designed around Holteks Ht8970 voice echo IC. Project can be used in various audio systems karaoke, toys, animatronics, show, display, exhibitions, and sound equipments. The HT8970 is an echo/surround effect processor. It is designed for various audio systems […]
Back to the mc-17 remote control
Tim writes: After the Maker Faire, I went back to the Graupner mc-17 remote control. The Arduino library from tronixstuff for the KTM-S1201 LCD which is also using a mPD7225 controller was a good starting point. But to get the LCD up and running, it took quite a bit of fiddling and logic sniffing. Once […]
A look inside a ’70s voltage and current standard
SQKYBeaver did a teardown of a Techtron Standards type 51 voltage and current standard: Absolutely amazing inside! The wires to the front panel look like the were loomed by a professional Spacecraft mechanic. every one individually numbered it must have taken hours. only 4 rc4136 quad opamps for all this functionality, two dating back to 1973.
#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 […]
Bus Pirate v3.6 DIY plexiglass case
Tim designed a plexiglass case for his Bus Pirate v3.6: Just a colourful photo of my newest acquisition, the Bus Pirate v3.6 in a quick 2hr diy plexiglass case More awesome DIY cases. Get an assembled Bus Pirate for $30, including world-wide shipping. Also available from our friendly distributors.
Classic NES played using a Kinect
Control your classic NES console with the Kinect V2 sensor by Paul DeCarlo: Ingredients: An NES console with game to test An NES controller OR some wiring skills and a CD4021BE 8-bit shift register 12 strands of wire, recommend Kynar 8 1k resistors (technically any value from 1k to 50k should suffice) 2 3.6k resistors (again […]
ChronodeVFD: Wearable Electronics VFD wristwatch
Johngineer wrote an article detailing the build of his ChronodeVFD wristwatch: The ChronodeVFD is a personal project I’ve been working on for a couple of months. It’s a wristwatch built around the IVL2-7/5 VFD display tube. I originally purchased a few of these tubes to build a standard desk clock, but after playing around with them, […]