Simple project for 10-11 year old.

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=-

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

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

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=-

Oooh I like Billabott's idea of using a potentiometer and having it fade the colours - that makes for a much more interesting result for the kids to play with when done. Using an RGB LED would be great for that (and adds a lesson in combining light colours).

Actually, I was thinking that the pot would set the cyclic rate of a heartbeat-like dimming and brightening.

But I guess just letting them play with a "brightness" knob would be fun for them too.

Pat:  It took me a while to realize that 5.08 mm is 0.200 inch on the device's through-hole pin spacing

in order to use a standard breadboard!

So here are parts recommendations to save you some time.

RGB LED:

Manufacturer: FORGE EUROPA

Order Code: 8738661

Manufacturer Part No: FCL-P115R078G03B12WCCI

1 @ £2.11

DIP SWITCH:

DIP SWITCH, 8 POS, SPST, RAISED SLIDE

Manufacturer: MULTICOMP

Order Code: 9471596

Manufacturer Part No: MCDS08

1 @ £0.66

No problem.  You are welcome.

Thank you so so much for all your help guys.

I'm currently building my shopping list based on the ideas from Nico and Billabott, using the dip switch to control an RGB LED.

So I've got this

• Multicomp Nano boards - 1813414

And this in my basket:

• Forge Europa RGB LED - 8738661 - £2.11
• Multicomp DIP Switch - 9471596 - £0.66
  • Thanks Billabott for the links
• Wisher Breadboard - 1472862 - £4.23
• Wisher Jumper Kit - 1472867 - £5.38
• And a ping pong ball - All good sports retailers

Not sure if these will be the cheapest but best I could find after a quick search on Farnell, am I forgetting anything?

if they`re going to be stand-alone boards, then a 9V batt and some clips would be an idea

I also looked at those LEDs and from what I can see, I think you`ll need resistors for them, 330 Ohm or there abouts, and 3 of them per LED.