Smart (schematic) snippets ideas for design solution

[blauwhaar]

I know there is Google, but why not one place to get everything you need  



Sometimes you need a solution for a headache question:

For example:

keyboard decoder with ADC:
=====================
keyboard created with resister divider connection to one ADC converter, 
VCC-Rf-Re-Rd-Rc-Rb-Ra-ADC-Rs-GND, buttons on Ra..f to GND.
It is possible for example 10 buttons on one microcontroller pin, otherwise
you should use a matrix which use more mcu pins.

i2c optical isolation
==============
Think, realise and see the troubles.
solution: http://www.embedded.com/design/prototyping-and-development/4025023/Opto-electrical-isolation-of-the-I2C-Bus

i2c slave addon for debugging:
=======================
i2c slave device board connected to application to sent debug messages,
often there is no serial port available in small microcontrollers but an i2c port exists.
I use this trick for debugging small cypress usb controllers.

In future these examples must be separated, and if possible:

Smart schematic snippets
--\ ADC
    --- n keys on one ADC microcontroller pin
--\ I2C
    --- I2C optical isolation solutions
    --- debugging with I2C

I think it is very usable for developers/designers.