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4WD Robotic Car controlled over Bluetooth with iPhone App

After massive brain damage I finally managed to build a prototype 4WD Robotic car controlled over Bluetooth using iPhone app. This was done using serial communication between Arduino mega and Hercules motor driver. Sorry for not posting detailed pinout diagram. If anyone interested in detailed connections please drop me an email or comment. The real trick was to make the serial connections work and test without connecting the USB cable on Hercules. Hercules board should have had two serial communication pins for easy testing as it was pain to keep removing the connected Arduino serial connections for testing. Anyways its done now ;-)

Parts used in this demo

You can download the source code used in this project “CarRemote” in Github. Please forgive my bad C code as it been real long time.

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4WD Robotic Car with 15 Kilo Load Test

Finally I put together my 4WD Robotic car. Thanks to Hercules Motor controller it’s doing what I am expecting of it. My self challenge was to make it carry 5 gallon water bottle. Few attempts failed as the motor was starting and stoping fast and the bottle was jumping out of the car. So I had to increase and reduce the speed slowly.

Parts used in this test

Source code used for this experiment ;-)

Watch out for next update with remote control :-D

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Time Lapse Video using CubieTruck and Nikon D200

Today it was whole lot fun exploring the possibilities with Raspberry Pi and DSLR for taking time lapse video. Latter I moved from Raspberry Pi to CubieTruck so that I can attach hard drive for large storage capacity. I found a small command line utility gphoto which can be used as remote control for a DSLR. I can use the utility to click a photo and stream the picture to the Pi.

The version I found on the apt-get was little old so I had to compile my own version. Then you can play around with the gphoto command to play around.

EDIT: Forgot to mention about the cronjob

Last but not the least to make the images into a movie

It was fun I hope you will enjoy doing it ;-)

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Capacitive touch Drumkit with Raspberry Pi using MRP121

Couple of weeks ago I backed a new project Touch Board: Interactivity Everywhere on kickstater. This project excited me so much and I couldn’t wait for the finished product to arrive in March. I started to search for capacitive touch chips and finally landed on MPR121 breakout board on Sparkfun. Ordered them and received it 2 days ago and could not wait anymore and directly jumped into building a drums kit.

To make this work I did some research and everything was available but from different website. In this article I will put everything together in one place. I will go step by step

What do you need ?

1) Raspberry PI loaded with Raspbian OS.
2) MPR121 Capacitive Touch Sensor Breakout Board
3) Aluminium Foil for touch board
4) Connecting Wires

Configure I2C

I2C is a very commonly used standard designed to allow one chip to talk to another. So, since the Raspberry Pi can talk I2C we can connect it to a variety of I2C capable chips and modules. Please follow anyone of the following links to configure I2C on your Raspberry pi.

I2C and Raspbian wheezy
Adafruit’s Raspberry Pi Lesson 4. GPIO Setup

Connect the circuit

Can you detect the address of the MPR121 board ?

If you are not able to see 5a, try the command with i2cdetect -y 0. Still no luck! Google is your friend…

Download Code

Thanks to Scott Garner has contributed the complete source code of the beetbox. Download the code from github and run the program.

You should be able to hear the sound when you touch the foil inputs. If you are not able to hear the sound you can refer to this article to play sound file from command prompt in Raspberry Pi.

Thanks to Bare Conductive for inspiring this project… ;-)

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New in Town – Cubieboard3 aka CubieTruck

Cubietruck is the 3rd board of Cubieteam, we also name it Cubieboard3. It’s a new PCB model adopted with Allwinner A20 main chip, the same with Cubieboard2. But it is enhanced with some features, such as 2GB memory, VGA display interface on-board, 1000M NIC, WIFI+BT on-board, support Li-battery and RTC, SPDIF audio interface.

Features

  • Allwinner Tech A20 SOC
  • SATA supported
  • 54 extended pins
  • Built-in HDMI/ VGA display interface
  • Built-in WIFI+BT module
  • 2GB DDR3 RAM
  • Built-in IR receiver
  • SPDIF audio interface

Specifications

  • Allwinner Tech SOC A20 ARM® Cortex™-A7 Dual-Core ARM® Mali400 MP2 Complies with OpenGL ES 2.0/1.1
  • 2GB DDR3@480MHz
  • HDMI&VGA 1080P display output on-board
  • 10M/100M/1G Ethernet
  • WIFI + BT wireless connection with antenna on-board
  • SATA 2.0 interface support 2.5’ HDD (for 3.5’ HDD, only need another 12V power input)
  • Storage solution NAND + MicroSD
  • 2 x USB HOST, 1 x OTG, 1 x SPDIF, 1 x IR, 4 x LEDs, 1 x Headphone, 3 x Keys
  • Power DC5V@2.5A with HDD support Li-battery & RTC
  • 54 extended pins including I2S, I2C, SPI, CVBS, LRADC x2,UART, PS2, PWM x2, TS/CSI, IRDA, LINEIN&FMIN&MICIN, TVIN x4 with 2.0 pitch connectors
  • PCB size 11cm *8cm*1.4mm

Received my board last week. Out of all the board I had tested so far this one is the most powerful I have tested. Really enjoying the performance so far but need to hack in more for the Bluetooth and other options which is built in the board. Will keep posted :-)