Simple project for 10-11 year old.

perhaps you could also employ an Analogue pin to work with Galvanic Skin Responses/resistance, you`d Hook-em-up   then take a sample reading every 10 seconds for a minute, add the samples together and divide my 6 to get your Average, and then use this value as the baseline for tests.

http://en.wikipedia.org/wiki/Skin_conductance

you could still use the LEDs and even the Tone generator to listen to fluctuations under stress or when happy etc... and then see how that compares.

croc clips on some tinfoil rings would be ok as electrodes as long as both metals are the same.

just a thought

Hi YT

This is a great idea, but a little complicated for the first project i think. I'm thinking some this a little more manual, where they could move a slider or switch to show how they were feeling yesterday or how they feel about something that they will be doing tomorrow.

Pat

Ok, how about using an Analogue pin to control a Tone, and see if you can make musical instruments with them?

you could use all sorts of Input devices then, a Light sensor, pencil leads for variable resistors, slider pots, switches with resistors, even a wet peice of string or salty dough, the sky`s the limit really

it`s unlikely they`ll get on Top of the Pops, but it`s nice and interactive.

That is a Great Plan.

The idea and techniques of bio-feedback should be pretty well documented through out the web.

I guess you would have to figure out how to detect, tune, and amplify the alpha and/or delta wave of the person under test.

-=Syntax Matters=-

Yeah, theremin style output is great way to explore with analog inputs.  An infrared proximity sensorinfrared proximity sensor is also a fun analog sensor.  I've played around with a few, and Jeremy also does in his Arduino Tutorial #4. 

In addition to audio tone output, it's interesting experiement to map analog input to analog output (PWM) hooked up to an LED or motor.  I had the IR prox senors input map to servo motor output after seeing Jeremy do it in Tutorial #5.

In fact, there are a couple element14 members who've done GSR project

Simon Monk created a Lie Detector for his 30 Arduino Project for the Evil Genius book:

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RE: Simple project for 10-11 year old.

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I tried a couple different approaches for GSR in the Pumping Station: One biosensor array project:

http://www.element14.com/community/groups/pumping-station-one/blog/2011/05/08/ouch-sensing-galvanic-skin-response-gsr

Cheers,

Drew

Thank you for all your help guys, but I'm not sure the school would really like us building lie detectors plus it's a bit too complex for the pupils to get their heads round in an hour. I'm really looking for something that the children can pick up and build in say 20-30 mins that displays a representation of a feeling, using say a board, some LEDs and a switch or two. Maybe I'm looking for the impossible?

In that kind of timeframe your traffic light is probably the best way to go.

If you're using the Nanos, you could just have one momentary switch which when pressed lights the next LED in sequence. So you would have 1 switch on a pin, and 3 different colour LEDs on 3 separate pins.

If you have computers available, you could make uploading the sketch part of the lesson, in which case you could start with one LED, then add a switch to turn that LED on and off, then go to 3 LEDs.

Would you have the Nanos on breadboards too? There would be plenty for them to learn just with breadboards, uploading sketches, and hooking up switches and LEDs.

Good luck! Hope it goes well

Cheers,

-Nico

Hey that lie detector idea sounds interesting,

the GSR detector is represented by two metal electrodes ?(any specific material?)

The program does most of the work - have that gsr sensor as an analog input and read it a few times, get an average, and if it's over a certain point turn an led red?

Did you ask the school if they would be okay with the students building lie detectors?  I am opposed to knowledge suppression in all its forms.  And your statement certainly set off my alarm bells.

Okay, so if you want them to manually output "how they are feeling" using a RGB LED and the input device must be analog or digital.  The simplest analog would be a potentiometer and the simplest digital would be dip switch.  A three position switch would allow binary counting from 0 to 7  which corresponds to the capabilities of the LED.  As an optional challenge you could add a block of code to  pulse the brightness of the selected color(s)  in the LED via PWM.   And beyond that, the pulse rate (fast or slow) could be modified based on another bank of dip switches or a pot.  I think the arduino has enough I/O pins to do this and demonstrate all the basic modes of I/O.  Therefore, in my definition I2C is an advanced mode.  Savvy?

Use a white ping pong ball for a diffuser over the LED if needed or available.

Don't forget the current limiting resistors for each leg of the LED(s).

-=Syntax Matters=-