Forgot to put down these two links -<br><br>1. Source code at <a href="http://dev.laptop.org/git?p=projects/measure;a=summary">http://dev.laptop.org/git?p=projects/measure;a=summary</a><br>(You could git clone it like this: git clone git://dev.laptop.org/projects/measure)
<br>2. Wiki Page - <a href="http://wiki.laptop.org/go/Measure">http://wiki.laptop.org/go/Measure</a> (The peripherals would be put up on this page in a day or two)<br><br>thanks,<br>Arjun<br><br><br><div><span class="gmail_quote">
On 9/15/07, <b class="gmail_sendername">Arjun Sarwal</b> <<a href="mailto:arjun@laptop.org">arjun@laptop.org</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Measure Activity on the XO<br><span style="font-style: italic;"><span style="font-style: italic;">(</span>The Activity which converts the XO into an oscilloscope, a spectrum analyzer and a data logger !)<br><br><br></span>
Release 9 of the Measure Activity (build 575 onwards) features an improved UI and the following basic features -
<br>* Apply an AC or DC signal into Mic_In port, or simply observe the sound signal picked up from the Mic on the XO<br>* Watch the signal in time domain for frequency domain representation<br>* Toggle the bias voltage at the Mic_in port ON/OFF. This voltage is required by many sensors.
<br>* Log data at a specified interval, take a snapshot of the current waveform; and draw a graph of the logged data too.<br><br><br><br>How can you help ?<br><br><br>(1) Help in software development of the activity. There are many refinements and features that can further be added. I have put some of the priority ones down as tickets in Trac. Have a look at
#3435, #3437, #3438 and #3461.<br><br>(2) Do projects (and help document them ) around the Measure Activity. Ideas ranging from building a low cost ECG system to a low cost intrusion alarm system. I've built and tested two ideas illustrating the concept :
<br>=>'A low cost intrusion alarm system' that makes use of a toy laser that I powered from the USB and used a simple LDR (light dependent resistor) connected to the MIC_IN. Switch on the bias, set the activity to DC mode; observe the voltage change when the light path of laser upon the LDR is cut!
<br>=>'Temperature' monitoring system that I made simply with an LM35 temp sensor, and I powered the sensor from the USB port. <br><br><br>(3) Help develop content and curriculum around the Measure activity. Science experiments, Physics concepts...being able to relate concepts with physical phenomena through hands on experiments makes for great learning !
<br>For example, kids can whistle into the mic and using the frequency domain display mode in Measure, compare and learn about frequencies...<br><br><br>(4) Want to build a low cost science/physics/chemistry lab ? A tele-health monitoring system ? Lots of possibilities to be explored. All new ideas welcome!
<br><br><br>
(5) Help document such projects and other cool ideas . We would , in
probability, be going in for Makezine DIY style documentation of such
projects - with cool illustrations, photographs and explanation...<br><br><br><br><br>Get in touch with me at <a href="mailto:arjun@laptop.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">arjun@laptop.org
</a> for any details/clarifications.<br><br>Looking forward to great collaboration and support from the community.<br><br><br>sincerely,<br>Arjun<br><span class="sg"></span></blockquote></div>