Raspberry Pi Microcomputer Gets Beefed Up — Still Only Costs $35 The Raspberry Pi microcomputer has been a stunning success. More than 2.5 million of the low-cost Linux microcomputers have been sold in the two+ years since the gizmo went on sale, helping to power all manner of homebrew projects. The sales figure is especially impressive when you consider that the not-for-profit UK organization behind the device initially reckoned it would sell maybe a few thousand units over its lifetime. Given the large community that’s built up around the Pi, there have inevitably been calls for tweaks to the design to incorporate improvements that make the board more flexible and capable.
Secret-Knock Gumball Machine One of the best things about exhibiting at Maker Faire is giving attendees a challenge. For the 2010 Maker Faire Bay Area, I decided to combine a past project of mine, a door lock that opens only when you give a secret knock, with a standard crowd pleaser: candy. The result was this Secret-Knock Gumball Machine, which tempted and tested the crowds at Maker Faire to guess the right rhythm and receive a treat. Since the knock was not terribly secret (I happily handed out hints), it distributed hundreds of gumballs over the event’s two days. The “secret” knock defaults to the famous “Shave and a Haircut” rhythm, but you can program custom knocks by simply pressing a button and knocking a new pattern. The machine only listens for the rhythm, not the tempo, so the correct knock will dispense a treat whether you perform it fast or slow.
0 Motivation When I bought such a motor control shield recently, it came as a kit without any instructions. I could find the circuit diagram and list of parts on the Internet after some searching, but almost nothing on assembly and how to control it. Therefore I decided to create this page to share with the community what I learned so far. How to make your first robot If you have purchased an "Instant Robot" shield, you can find a project using that shield here. If you prefer the instructions in a single PDF, Dominic / Servello has made this nice PDF to download - Thanks :) Welcome :) Everything here is so easy, that after you have gone through it, you can make a robot in a couple of hours. Why can't you do that now? Power Supply Design considerations and solutions for powering your projects This page is new November 1st 2010. As it grows, the way the relevant material is split into categories will have consequences for years to come, and will ensure... or prevent... the page's success. Care, please? Electronics 101 Voltage: What your voltmeter reads.
Setting up LIRC on the RaspberryPi - alexba.in June 8th 2013 Update: I have completed a soldered circuit prototype, complete with a full parts list and high resolution build pictures. Please read Open Source Universal Remote - Parts & Picturse to learn more. March 9th 2013 Update: I have formalized the schematic and parts list that I’m using and have made it available on Upverter. Please read RaspberryPi IR Schematic for LIRC for more details. March 4th Update: I’ve written a follow up post that describes how to control your RaspberryPi universal remote from the web.
Charlieplexing LEDs with an AVR ATmega328 (or Arduino) Charlieplexing is an ingenius method for controlling many LEDs without using many microcontroller pins. You can turn on or off one LED at a time. To light more than one LED at a time, you can scan the LEDs by turning a sequence of them on and off really fast. The number of LEDs you can control is determined by this formula: N pins * (N pins – 1). Yet another laser cutter When my EPSON 830U decided not to work for me anymore (printing heads clogged) I thought I could make some use of the still working mechanics of the printer. It's based on a couple of stepper motors for both axis of motion (print head and paper feed). So I replaced the original power supply and drive electronics for an arduino board and an stepper motor driver from Adafruit industries.
MotorShield Kit Make: Projects Make your Arduino a nice tidy platform for robotics and mechatronics with the MotorShield. Power up and control your servos, bi-directional DC motors, and stepper motors in all kinds of combinations. Arduino is a great starting point for electronics, and with a motor shield it can also be a nice tidy platform for robotics and mechatronics. The MAKE MotorShield Kit, designed by Adafruit Industries in partnership with MAKE, is a full-featured motor board that can power many simple to medium-complexity projects. It’s got:
Learning interprocess communication with the ACE Framework - Aurora For most programmers, interprocess communication (IPC) is synonymous with using the Socket API. The Socket API was originally developed for the UNIX® platform to provide an application-level interface on top of the TCP/IP protocol. It supports a plethora of functions, some of which are shown in Table 1. Table 1. New release: HVAC IR Remote Module for Arduino / Raspberry Pi IR Remote is a small shield that allows you to record any infrared command sent by a remote control and resend it from the Internet. It works connected to Arduino and Raspberry Pi, and let us to control any HVAC system including heating,ventilation, air-conditioning and thermostats from the Cloud. We offer 6 different wireless interfaces to connect Arduino and Raspberry Pi to the Internet: WiFi, 3G, GPRS, Bluetooth and 802.15.4 / ZigBee. With IR Remote you can easily control our home HVAC system from a laptop, a webserver or even from your smartphone. The shield is compatible with both Arduino and Raspberry Pi so you can choose your favourite platform to automate your home. You can find a detailed Tutorial to know how to use IR Remote Module with your favourite HVAC devices, as well as a demonstration video to show a basic example of what it can do.
RGB Liquid Crystal Display Tutorial Step #2: PrevNext Now we will prepare everything to start connecting to the Arduino. Insert the display into the breadboard with the pot next to it. Then connect 5V and GND to the breadboard rails as I have done.