Jun 22, 2010 1
Nokia N900 has a bunch of interesting sensors and actuators. This post explain how to read the internal sensors (e.g. accelerometer) and write the actuators (e.g. vibration motor) by accessing sysfs in X Terminal application. Details can be found in Maemo wiki pages
Jun 15, 2010 Comments Off on Measure pendulum with accelerometer
Acceleration sensor can be used to measure pitch, yaw and roll. The same method can be used to find amplitude. It’s all about tilt.
Aug 9, 2009 1
This demo is implemented with S60 Python connected to BASIC Stamp 2 via Sparkfun BlueSMiRF Silver bluetooth module.
Aug 6, 2009 Comments Off on Temperature probe: measuring temperature
Jul 4, 2009 2
BlueSMiRF Silver is a bluetooth module from Sparkfun Electronics. This post describes how you can set up connectivity between your PC and BlueSMiRF.
Apr 15, 2009 Comments Off on PWM by AVR-GCC
Arduino NG supports PWM with three pins – 9, 10 and 11. Those pins are assigned to Atmega8 PB1(OC1A), PB2(SS/OC1B) and PB3(MOSI/OC2) pings
PB1 (OC1A) – Arduino Pin 9
PB2(OC1B) – Arduion Pin 10
PB3(MOSI/OC2) – Arduion Pin 11
Apr 13, 2009 1
Interrupts are interruptions from the main program flow triggered by some event. Interrupts are not supported by BASIC Stamp but Arduino can support it by including a library. AVR MacPack (AVR-GCC) also can support it by including <avr/interrupt.h>. Interrupts is very useful function because you don’t have to listen to the external event all the time in your code. If you assign the external event as interrupts, AVR jumps to particular function when the event happens and returns to current location of the code.
Apr 13, 2009 Comments Off on Control LED by pressing button (digital input functions in AVR)
This post describes how to program Atmega8 on Arduino board using AVR-GCC. The program enable user to control a LED by pressing a button.
Components
Apr 11, 2009 1
Bit operations are used when interfacing with digital out such as switching pins On/Off. Programming with bit operations enable following functions to control digital out.
Apr 11, 2009 Comments Off on Atmel Atmega8 (Arduino NG) Digital I/O pin register
Digital and analog pins are controlled by accessing bits. Arduino NG Diecimila has Atmel Atmega8 on board and Atmega8 has two digital ports and one analog (digital to analog converter) port. This post describes Pin assign between Arduion and Atmega8. It also describes location of bits assigned to specific ports.
Apr 9, 2009 Comments Off on Blinking LED on Arduino NG with AVR MacPack first time
As Arduino has Atmel chip on board, you can also program code with C on your Mac. Softwares for the developing environment are all free. Programming with C looks more complicated but still all logic are the same as Arduion IDE and you can even create more functions with C. Once you have managesd to run your C language code on Arduio, you can also flash the code to other smaller or more powerful Atmel chips. This post describes how I as Mac user managed to write a code to blink LED on Arduion board.
Jan 16, 2008 Comments Off on Digital and Analog IO using MIDI
If you have following issue on your physical computing. Miditro Wireless might be a solution.
Nov 10, 2007 Comments Off on Pulse IO for Ping))) Ultrasonic Sensor
PBasic code for Ping))) Ultrasonic Sensor looks very simple.
BASIC Stamp PBasic code:
pPing PIN 7 ‘ 7 pin connects to SIG pin of the PING)))
wTime VAR WORD ‘ declaring wTime as a variable
cTrigger CON 5 ‘ trigger pulse = 10 uS for BS2DO ‘ repeat between DO – LOOP
PULSOUT pPing, cTrigger ‘ send a command to Ping)))
PULSIN pPing, 1, wTime ‘ receive a value from Ping)))
DEBUG DEC5 wTime, CR ‘ send the value to computer
PAUSE 100 ‘ stop for 100 milliseconds
LOOP
If you are not familiar with BS, you can only look at Pulsin and Pulsout. Once BS sends a Pulse for a certain period. The period seems 50µs. The Ping))) sensor send back the value after that.
Pulseout command:
PULSOUT Pin, Period
- Pin is a variable/constant/expression (0 – 15) that specifies the I/O pin to use. This pin will be set to output mode.
- Period is a variable/constant/expression (0 – 65535) that specifies the duration of the pulse. The unit of time depends on the microcontroller. in my case, a unit is 10µs.
PULSIN Pin, State, Variable
- Pin is a variable/constant/expression (0 – 15) that specifies the I/O pin to use. This pin will be set to output mode.
- State is a variable/constant/expression (0 – 1) that specifies whether
the pulse to be measured is low (0) or high (1). A low pulse begins
with a 1-to-0 transition and a high pulse begins with a 0-to-1
transition.- Variable is a variable (usually a word) in which the measured pulse duration will be stored.
f you want to simulate this on Max/MSP via Maxduino by Marius Schebella and Arduino, You can download a PDF about the PING))) from Parallax site. Page 3 would be helpful to understand the pulse.
Apr 11, 2007 Comments Off on Controlling servos with Motion Sensor
At the beginning me and Linus Roune both had a go at controlling Servos with some sort of data we would get form a sensor. Linus got into some heavy stuff with Arduino I went to look for solution using Basic Stamp.
The servos we had were Parallax (Futaba) Servos so hooking them with Basic Stamp was easy, and I found the code on the web. What I didn’t pay attention to was the difference between Standard and Continuous Rotation type of servo.
Feb 22, 2007 3
In the example, we use an Arduino board to receive analog signals from 3 sensors, and send them to the computer’s serial port.
A simple Processing application listens to the serial port, and creates an XML socket where it sends the signals it receives.
The Flash application listens to the XML socket created in Processing, and when an event occurs, a function is launched to process the received data.
Below are example snippets for each part of the solution:
Arduino code example
Processing code example
Actionscript code example
The Flash game shown at the presentation
The game sources (fla+arduino+processing)
– Viljo Malmberg, Aleksi Hyvönen and Brian Mogensen
Feb 18, 2007 2
INSTALL PROCESS
It is possible to make Arduino and Pure Data communicate with each other so that one doesn’t have to program Arduino with it’s own programming language (which is called Arduino).
Feb 13, 2007 Comments Off on Interfacing servo motor with Arduino
The Arduino (build 0007) analogue output pins (PWM 9-11) have a frequency of approximately 30769 Hz. According to the Parallax documentation (http://www.parallax.com/dl/docs/books/edu/roboticsservomod.pdf) the low time for a pulse train can be between 20-40ms which means that the Arduino pulse is in the range. However, to be consistent with the BS board the frequency can be lowered by the following code =>
