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I’ve been looking for simple ways to graph the data from a sensor attached to a microcontroller lately, because it’s such a necessary activity if you want to look at sensor data over time. Using Apples Grapher program, which comes with OSX, I found a simple way that involves only four lines of code on an Arduino or Wiring microcontroller, and produces graphs like this:
This patch receives an ASCII-encoded decimal string that ends with a linefeed and carriage return in the serial port, and converts it to a number. A Wiring/Arduino program to send data to it follows. It’s based on an example by Jamie Allen.
To use the patch, copy the text and paste it into a new max patch window.
Thanks to David Mellis and Jamie Allen for the collaboration. These patches were written for a one-day Arduino workshop at NIME 07 hosted by the three of us. The Arduino program comes from the Arduino example files, by David Mellis.
A very basic serial input program for Max/MSP
To use the patch, copy the text and paste it into a new max patch window.
Thanks to David Mellis and Jamie Allen for the collaboration.
Technorati Tags: serial
This Max patch takes in serial data and graphs it. It’s useful for seeing the changes in an analog sensor. An Arduino code sample that works with it follows the patch.
To use the patch, copy the text and paste it into a new max patch window.
Thanks to David Mellis and Jamie Allen for the collaboration. These patches were written for a one-day Arduino workshop at NIME 07 hosted by the three of us. The Arduino program comes from the Arduino example files, by David Mellis.
Technorati Tags: serial
This code reads a Devantech CMPS03 digital compass on Wiring or Arduino using the Wire library for I2C.
Continue reading “Devantech CMPS03 digital compass reader”
This code reads a Devantech SRF02 ultrasonic ranger (and probably an SRF08 and SRF10 as well) It uses the Wire library for Wiring and Arduino.
Continue reading “Devantech SRF02, 08, 10 Ultrasonic Ranger reader”
The Devantech SRF04 and SRF05 ultrasonic sensors are easy to use and reasonably accurate distance ranging sensors. To use them, you send the sensor s pulse of 10 microseconds on its INIT pin. Then the sensor sends out an ultrasonic pulse and waits for the pulse to bounce off something and return an echo. The sensor then pulses its ECHO pin. The length of the pulse in microseconds is proportional to the distance of the object from the sensor. The code below reads a Devantech sensor on an Arduino or Wiring module.
This Processing sketch controls the playback of a Quicktime movie using serial data. To use it, send a serial value from 0 – 255. The movie position will be set based on that value. 0 = beginning of movie, 255 = end of movie. It doesn’t matter what’s sending the serial data, as long as the value is between 0 and 255.
Hans Steiner, God of PD/USB and a darn nice guy, has released PDuino. In his words:
“Here’s the first test release of Pduino, a Pd firmware for Arduinoand a matching Pd object, . This allows you get data from the digital and analog inputs, and send data to the PWM and digital outputs. It also allows you to change the digital pins from input, output, or PWM. And you can choose how many analog inputs and turn on/off digital input.
“Keep in mind its a test release, the only thing I am not sure about right now is digitalInput, everything else seems to work fine. In the future, I’d like to figure out how to add the pulseIn feature.
“This firmware would work well with Processing, Max/MSP, Flash, whatever. Then the Arduino becomes a dead simple, cheap sensor box for the newbies, but still open for playing later.”
This code reads three sensors and sends them out serially when prompted by another computer. It works with this Processing example. Arduino/Wiring, PicBasic Pro, and BX-24 versions are shown.
Continue reading “Serial Call-and-Response (Microcontroller side)”