How to add more Outputs to your Microcontroller

This Instructable will show you step-by-step how to add 8 extra digital outputs, using only 3 of your microcontroller's digital outputs.

Step 1 Which Microcontroller Should You Use?

In order to do this Instructable with your microcontroller, you will need to make sure that it has the following:

(3x)......Available Digital Outputs (Analog/PWM Outputs will work too)
(1x)......Ground/GND Pin
(1x)......10k (or more) of programming space

Comments

[njkl44]

lets say i wanted to add more analog for sensors, what would the code look like then?

[Qtechknow]

I think that instead of a pwm expander, (for analog output) you would need a mux(multiplier) to expand the number of analog inputs. Sparkfun has a $5 breakout

[TECH GEEK]

you would need a different chip like this: http://www.sparkfun.com/products/10136

[Foxtrot70]

How do you force a chip to start on the last program running after a power down?

[samj2]

mention the controller please?

[axeman911]

will it work without the capacitor, if we just connect it directly to ground?

[phevtron]

very straight forward :)

[TECH GEEK]

thanks