App note: Choosing and using bypass capacitors

Bypass capacitors ensure a device has a stable and clean power supply. In most cases capacitors are chosen out of habit, such as the typical 0.1uF ceramic capacitor we use. This app note describes how calculate, model, and use different types of bypass capacitors. Included is a table with all the relevant information on different […]

Week in (p)review: November 04, 2011

Here’s a summary of major developments over the last week: Dangerous Prototypes source code visualization Open 7400 competition winners Home Camp: Dangerous Prototype’s presentations Bus Pirate v4  free PCB build Greeeg developed a micro board for the Bus Pirate v3 Jared wrote about his experience interfacing the Bus Pirate with an audio codec chip using […]

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 a every week: Free PCB Sunday. The classic. Every week, […]

Bus Pirate: Interfacing with the ChronoDot over the I2C

Paretech used his Bus Pirate in I2C mode to interface with the DS3231 real time clock located on the ChronoDot board. The DS3231 is a high precision real time clock IC with an integrated crystal. He documented his experience with both devices. All the resources needed to setup a I2C connection to a DS3231 are […]

ARM announces 64-bit ARMv8 Platform

ARM announced that they will release 64bit microcontrollers. The ARMv8 uC will feature a 64bit instruction set, as well as extended virtual addressing. The uCs will have two execution states, AArch32, and AArch64. While the AArch64 handles the 64bit instruction set, the AArch32 executes the existing ARM 32bit instruction set. A compiler for the new […]

Bus Pirate: Interfacing with an audio codec chip

Jared wrote about his experience interfacing the Bus Pirate with an audio codec chip using the I2C mode: It is no exaggeration to say the Bus Pirate saved me a metric crap-ton of time. In about ten minutes, I had the Bus Pirate hooked to the audio codec, figured out the text command interface, and […]

NXP Cortex-M0 microcontrollers in TSSOP and SO packages

NXP Semiconductors announced a new 32bit Cortex M0 microcontroller in low-pin-count packages. SOIC, TSSOP, and DIP versions are currently available for their LPC111x devices. With Microchip also planing to release their PIC32 devices in similar packages, hobbyists will now have a choice of 32bit uCs in DIY friendly packages. Via the forum.

Partlist Wednesday: Lithium-polymer battery charger chips

Lithium-polymer batteries are an excellent choice for portable projects. They are relatively cheap, hold a significant charge, and last for a long time. The drawback with these batteries is that they require rather complicated charging protocols. You have to watch out for overcharging, undercharging, overheating, etc… We are looking for a standard part to use in […]

IOIO andriod development board gets bluetooth support

Ytai demoed an IOIO android development board over Bluetooth. Connect the board to your Android enabled device and control various IO pins on the board: IOIO is a board providing I/O connectivity for Android. Until recently it would use a USB connection for communicate with Android. Yesterday, I announced Bluetooth support, which is achieved by plugging any […]

XC9572XL breakout board: Frequency counter

Jason implemented a frequency counter on an XC9572XL CPLD. It uses a 1Mhz clock to count the duration of the input signal pulse, and shows the output on a 6 digit display. Initially he had to use additional 7400 logic ICs to convert BCD output from the CPLD to the 7-segment displays. With some tweaking […]

In development: Soldering iron driver

Earlier this year Arhi developed a soldering iron driver (machine translation) that works with both PTC and K-type TC temperature sensors. In this design a microcontroller implements PID temperature control of the soldering iron, and shows the relevant information on a display. His posts in the forum inspired us to build one too. The soldering […]