code, circuits, & construction
code and fabrication resources for physical computing and networking
In a previous example, I showed how to detect a peak in a changing analog value on a microcontroller. This example shows how to do it in Processing, assuming the microcontroller is just sending you binary values from 0 to 255. It graphs the incoming bytes, and when a peak is detected, it draws an ellipse and prints a message in the message pane.
Thanks to Matt Young for helping me debug this.
Technorati Tags: pcomp, physical computing, sensors
This Processing sketch takes data from the serial port, graphs it, and writes it to a text file with a time stamp if there’s a significant change in any of the incoming values. It expects five values between 0-255 in ASCII, separated by tabs, and ended by a carriage return and newline.
The text file it generates is tab-delimited, and can be read easily in a spreadsheet.
A Wiring/Arduino program to send data to this sketch follows at the end.
Continue reading “Data graphing program that saves to a file”
The following Max/MSP patch uses the netsend object to send data over a TCP socket. It sends three values. The Processing sketch further down is a server that receives the string that the Max patch sends and uses it to move a ball on the screen.
Technorati Tags: networked objects, networks
Continue reading “Net connection between Processing and Max/MSP”
This Processing program takes a string of values in the serial port. It assumes the string is the API string from a Maxstream XBee radio. It parses the string and graphs the signal strength. See the XBee product manual for more info on the protocol.
The XBee radio in this program is attached to the computer’s serial port using an FTDI USB-to-serial module like this one from Spark Fun.
Technorati Tags: networked objects, networks, XBee
Continue reading “XBee Radio Received Signal Strength Graphing Program”
This Processing program takes a string of values in the serial port. It assumes the string is the API string from a Maxstream XBee radio. It parses the string and graphs the signal strength and the analog values represented in the string. See the XBee product manual for more info on the protocol.
The XBee radio in this program is attached to the computer’s serial port using an FTDI USB-to-serial module like this one from Spark Fun.
Technorati Tags: networked objects, networks, XBee
Continue reading “Xbee Radio Received Signal Strength and Data Graphing Program”
Working with the Maxstream Xbee radios on OSX can be annoying because the screen program doesn’t print a linefeed automatically when it receives a carriage return. This Processing program works as a serial terminal program, but inserts a linefeed when it gets a carriage return.
Technorati Tags: networked objects, networks, XBee
Dan Shiffman’s written a nice library to access the sudden motion sensor on the macbook and macbook pro. He based it on a couple other open source libraries. Below is a code sample for it that draws a plane on the screen and moves it as you tilt the computer.
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.
This program reads a serial string from a GPS reader. It parses the sentence and returns latitude and longitude.
It’s also a simple example of how to read an ASCII-formatted, comma-delimited serial protocol.