Here’s an entry in the Open 7400 Logic competition: Discrete servo driver. This entry is designed to control RC hobby servos. 8bit parallel BCD code input from a dip switch sets a pulse width between 0-25.6ms (180 degrees of motion). However on most servos the first 50 and the last 10 positions are unavailable so you have […]
Author Archives: Ian
#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 […]
Arduino MIDI foot controler
Bharat shared his USB MIDI foot controller. This design is basically an extension board for the Arduino that has a bunch of buttons and switches that control instruments and sound effects on a PC using an app like Guitar Rig. There are 3 switches to control the stomp box and 2 additional switches to scroll through sound patches. […]
DIY GLCD clock project
ezflyr posted his GLCD clock PIC project: The project is based around the 75×52.7mm 128×64 Graphic LCD. The time keeping is delegated to a battery-backed Dallas DS-3231 RTC. A PIC 16F876A is used to tie it all together. The PCB was designed to fit nicely behind the display. It is operated via two push buttons, which allow […]
MSPism: Nordic 2.4 + MSP/MSP mini battery board
Brian shared a MSP + ISM radio design with onboard battery. It was designed to work with this module. It uses MSP430G2553 mcu in conjunction with the Nordic nRF24L01+ 2.4GHz transceiver chip. The design also incorporates headers compatible with Digi XBee radio and a CR1225 battery holder.Tthe programing of the chip can be done from the […]
HH10D humidity sensor Bus Pirate interface
Anthony posted a tutorial on interfacing HH10D humidity sensor with the Bus Pirate. He did the hard work of finding the calibration data, follow his tutorial and you’ll save time. HH10D uses a change in capacitance due to humidity to alter the output pin frequency. The calibration data is stored on a I2C EEPROM. Two modes of the Bus […]
7400 competition entry: New earth time (NET) digital clock
Our 7400 competition is heating up, Andrew form Ajax Electronics entered his New Earth Time digital clock into the competition. NET is a new way of telling time using earth’s rotation in degrees and minutes. 24 hours is 360 degrees, and each degree takes 60 NET minutes. The NET system allows for universal time with no time […]
Bus Pirate v3.5 free PCB build
garyservin built a free Bus Pirate v3.5 PCB. If you build a free PCB we’ll send you another one! Blog about it, post a picture on Flicker, whatever – we’ll send you a coupon code for the free PCB drawer. Get your own handy Bus Pirate for $30, including world-wide shipping. Also available from our […]
SSD1308 OLED interface AVR library for Arduino/Teensy
Our forum regular Marcus posted a SSD1308 OLED interface library and pin connections to get you started with your Arduino/Teensy OLED projects. The display is a 0.96” 128 x 64 dot matrix that can be interfaced though both I2C or SPI interfaces, the library Marcus provides is SPI only and should allow you to get […]
MMA7455L 3-axis accelerometer back in stock
MMA7455L 3axis accelerometer breakout board is back in stock. Get the MMA7455L breakout board for $15 at Seeed Studio.
TI F2806x Piccolo controlSTICK dev-board
TI has a new cheapie $29 development board for the F2806x Piccolo microcontroller: High-Efficiency 32-Bit CPU (TMS320C28x™) 80 MHz (12.5-ns Cycle Time) Floating-Point Unit Native Single-Precision Floating-Point Operations Programmable Control Law Accelerator (CLA) 32-Bit Floating-Point Math Accelerator Executes Code Independently of the Main CPU Embedded Memory Up to 256KB Flash Up to 100KB RAM 2KB […]
Component organizer program
msr writes: I would like to share with you a small program that helps to organize datasheets and application notes (plus source code). It’s not open source because the code is not something I’m proud of (it was my first experience with C# and so it’s a completely mess :). However, I hope it could […]
Bus Pirate v3.1 free PCB build
Kelvin built a free Bus Pirate v3.1 PCB. If you build a free PCB we’ll send you another one! Blog about it, post a picture on Flicker, whatever – we’ll send you a coupon code for the free PCB drawer. Get your own handy Bus Pirate for $30, including world-wide shipping. Also available from our […]
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 […]
Logic Sniffer perspex case
buxtronix made a DIY Logic Sniffer case. Get your own Logic Sniffer for $50, with free worldwide shipping. More cool DIY cases here. Via the forum.
QR code generator script for Eagle
2D barcodes in Eagle: As i was preparing some boards for manufacturing (perhaps a 7400 entry) I thought it would be fun to partake in Itead’s OpenPCB program. But that requires me to have some identifying mark on my board and I thought a QR code would be perfect. Thanks honken! Via the forum.
Bus Pirate v4 free PCB build
Anthony built a free Bus Pirate v4 PCB. If you build a free PCB we’ll send you another one! Blog about it, post a picture on Flicker, whatever – we’ll send you a coupon code for the free PCB drawer. Get your own handy Bus Pirate for $30, including world-wide shipping. Also available from our […]
Multiband digital television tuner
rsdio writes: I’d rather find a DTV modulator chip than a tuner, but maybe some day… MAX3544 Multiband Digital Television Tuner Achieves Highest Performance with Spur-Free, Easy Design-In Architecture Addressing Worldwide Digital Standards Offers robust picture and increased receiving range to require much less engineering effort to implement Provides one single pin out and board […]
Multimedia demo at the Transfer Summit
Drone writes: Here’s a link with a video that shows the Raspberry-Pi alpha hardware playing a 1080p video. The video also gives you a good view of the board itself. Via the contact form.
USB IR Toy through-hole build
Chiva posted pictures of his USB IR Toy through-hole version. Via the contact form.