KRA5H

Sorry for the delay in responding to your question. I'm not sure what home made Colloidal Silver is, but commercial Colloidal Silver is, by definition,"a colloid consisting of silver particles suspended in liquid" (Wikipedia) and NOT silver ions.

Correct. As I said in the ible:"The parts I used for this project include the Kano Computer Kit Complete (Raspberry Pi with screen and keyboard) and the Snapino kit by Elenco (Snap Circuits Arduino block, several Snap Circuits components, battery pack and programming cable). These are optional. All you need for this project are the following:Parts Needed:Arduino UnoRaspberry Pi 3Power source for Raspberry Pi 3 (AC Adapter, or mobile phone battery back)Keyboard for the Raspberry PiScreen (computer screen or TV with HDMI connector)HDMI cableUSB programming cable for the ArduinoOperating system for Raspberry Pi which can be found here or you can try the Kano OS by downloading it from here."

I don't think this is a serious question, but, no, you probably won't be able to do these things with a simple cat toy laser pointer, lol. OTOH Laser light shows have been around for ages. To see the lasers requires an aerosol colloid (glycol or water droplets dispersed in air) made by theatrical smoke machines. The firs example that comes to mind is a music video from 1984 ("Relax" by Frankie Goes to Hollywood): https://www.youtube.com/watch?v=rCp2h5jslKY

Thanks

Actually the green LED does light up but it is too dim to see.

You might find these manuals useful for programming the LED MC block with the picaxe 08m2 microcontroller. Snap Micro set (discontinued product): http://www.elenco.com/admin_data/pdffiles/Snap-Mic...and Snap Circuits XP set (discontinued product): http://www.elenco.com/admin_data/pdffiles/SCXP-50....

Not sure what you are asking. The battery block is 4.5 volts.