Hello Guys / Gals,
I need your help, I'm a complete noob to this, I love it, makes me so happy to build things, I have a circuit that looks really simple its a water level sensor that was given too me for school, but I want to make it better add a buzzer. Its pretty simple I think, its a 9v battery to a circuit then to the red box that has 5 wires that you place in the water tank and depending on the depth if water touches the cable a led turns on. But I want to know how to build it.. They scratched the model of chiped used and the red box you cant open it so I dont know whats in it can you smart guys and gals please help me find out what model of chip is and whats in the damn red box Im trying to peel it but dont want to break ti Maybe a explanation on how it works?