So my friends and I have this project for our microcomputer class, our group is making this conveyor belt thing that sorts packages. We are using a treadmill as the conveyor (which is basically a 90VDC motor driven by a PWM motor controller than plugs into the wall).
Long story short, we need to be able to control this 120VAC load using the TTL signal microcontroller (it's a HCS12 but that's kind of irrelevant). My idea to use a NPN transistor to power a relay which will switch the large current/voltage. I know I can switch a relay using this the MCU and transistor but I've got a question about the relay.
What kind of relay do I need? Will the 12V 10A automotive one that I have work or will there be problems with the electricity breaking down the connection when the relay is off?
Long story short, we need to be able to control this 120VAC load using the TTL signal microcontroller (it's a HCS12 but that's kind of irrelevant). My idea to use a NPN transistor to power a relay which will switch the large current/voltage. I know I can switch a relay using this the MCU and transistor but I've got a question about the relay.
What kind of relay do I need? Will the 12V 10A automotive one that I have work or will there be problems with the electricity breaking down the connection when the relay is off?