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Hey im trying to get a 12 button keypad to work. im using a 20m2 chip and with the four rows connected to b0, b1, b2 and b3. and the columns connected to c0, c1 and c2. the code im using is init: symbol key_pos = b0 symbol key_value = b1 high 4 pause 500 low 4 debug b1 let dirsb = 225...

Hi im new to electronics this year. i have a basic knowledge of picaxe and have made a 5x7 LED matrix but now i have decided that i would like to make a clock. I have an OLED screen, some 20m2 chips and most basic components avalible to me but i am not sure where to start. Thanks Matthew.

I started taking electronics this year at school and in class today i made a basic movement detector that turns on an led when something crosses a beam of light and it got me thinking about vending machine's and i was wondering how to detect the difference between say a $10 note and a $20 note...