David Covarrubias ✭
I used an arduino uno, a wave shield from adafruit and an IR sensor made by sharp...either adafruit or spark fun carries them...just be careful, the ir sensors come in a few con figs based on the range you need....some work at very close to ground level but only read about a foot up...others read sever feet up but need to be higher off the ground...it depends how high the max step is and where you can place them....I can look up my code and help guide you through it