Hi all I have an Arduino UNO I am making a home alarm system(after a spate of burglaries in our street) have built an analog 4x3 keypad which uses just 1 pin. It works fine although my programming leaves a lot to be desired. The keypad returns these values 1=58, 2=96,,3=145, 4=228 ,5=335, 6=447,7=598,8=720,9=809,*=890 ,0=941,#=970. I have a program that prints the numbers 1,2,3,etc. to the serial monitor. I do not have a LCD display. I have spent many hours researching and only find keypads with many pins. I keep on trying but I am getting nowhere. There seems to be very little on the internet on this but considering the amount of pins keypads gobble up I am surprised more people are not using them.
I can assign one button turn the alarm on and one to turn it off but I cannot work out how to make a password. I have used the example password sketch with a 7 wire keypad and have had that working. The problem with that is that it uses too many pins. That is why I built an analog keypad. I would appreciate any advice you can give me. Please do not tell me to buy an alarm system like someone suggested on another group as I am disabled and have a very low income.
Thanks
Jeremy
Hopefully I have managed to attach some code of the buttons I have adapted from some code posted by a guy called Riaan Cornelius. It is very messy (sorry)