Hello all, Thank you for your emails.
1) eToys: It would be very nice to have support for Analog Input in eToys. You could use my code - See http://dev.laptop.org/git?p=projects/measure;a=blob_plain;f=audioGrab.py;hb=HEAD (getting samples) and http://dev.laptop.org/git?p=projects/measure;a=blob_plain;f=buttons.py;hb=HEAD (toggling between AC/DC modes and controlling bias voltage etc.) Or I could easily provide you with a class that you could use. I could make functions in that class that could simply return to you the required values. For example there could be a function that you could call to return avg voltage or rms voltage, select between ac/dc modes, set bias_on, set bias_off..... Let me know if I can help in any way. I have opened the following ticket . See here - http://dev.laptop.org/ticket/2800 I have not assigned the ticket to any one nor set a time line for it as of now. Please feel free to set those. 2) Output Analog/Digital: The USB is an interesting idea as I had discussed with Mitch. I could simply make a board using a USB to parallel kind of a chip. I will be getting down to doing something similar shortly. Anybody would suggest to explore audio out for a similar purpose ? 3) Other ideas for sensor input : Mitch and Wad had suggested regarding exploring some basic medical applications using the Analog Input port. For example maybe be able to measure pulse rate ... I am quite excited about these ideas and plan to think about things to do on these lines too. Any initial suggestions ? regards, Arjun On 8/11/07, Mitch Bradley <[EMAIL PROTECTED]> wrote: > > Hal Murray wrote: > >> - some parallel port (or similar) should be made available, for > >> children to play with in physics. I remember playing with a PC > >> parallel port with some simple software to turn leds on and off. When > >> you are a kid, being able to send commands to projects you create is > >> great (think about modern legos, but using simpler stuff like leds, > >> motors, etc) : it translate the "virtual part" ie the software you > >> create on the computer to the "real world" where you make leds blinks > >> in sequence, or a motor move. > >> > > ... > > There are USB connectors. > > > > ... > > USB to printer port adapters are also available. I've never played with > one. > > Prices are under $40. > > > > > > There are also things like this with 24 GPIO lines. > > USBIO24R > > http://www.elexol.com/ > > US distributor: http://www.orteches.com/ $75 > > ... > > > > There is also the microphone input and audio output for A/D and D/A. I > think > > the XO hardware supports a DC coupled mode. > > > > We should work on a collection of hacks to demonstrate how they work and > a > > list of which ones are known to work. > > > > OLCP just had a summer intern, Arjun Sarwal, who developed some low-cost > gadgets to plug into the mic port - temperature sensor, intrusion > detector, etc. He plans to document them and set up a framework for > documenting other similar hacks. > > We also talked about an OLPC digital gadget prototyping dongle with a > USB-equipped microcontroller like those available from, for example, > Atmel. Those chips cost a dollar or two and Arjun can get all the other > parts really inexpensively in India where he lives. > > -- Arjun Sarwal One Laptop Per Child [EMAIL PROTECTED]
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