Hi,
My understanding is pretty basic.
I am hooking relays to a parallel port which only has 3.5 volts which is not enough to trigger relay. I need some help please to wire up a 9volt battery in a circuit.
[EDIT -> Actually I think I have this working , I have just just used the 3.5 volts from a parallel port to the emitter and base of a transistor, to switch on 6 volts going across the emitter and collector.)/edit]
Also I wish to use the port to receive analogue input from a potentiometer. I can read bits, bytes or words from the port with the software. My understanding is that a pot will change the voltage from about 0 to 5 volts but to the bare port this will mean nothing excepting it is still receiving the same signal.
So I need a way to convert the voltage change into something else,
like an on -off pulse, or I maybe could use a picaxe chip(when I get one, which is a scary thought when you look at my first question) to send something more detailed if I say got a chip kit and programmed it. Im just thinking out loud not sure here, but if anyone could help even saying these ideas are off track or on . It will be to use the potentiometer for position sensing.
thanks.
My understanding is pretty basic.
I am hooking relays to a parallel port which only has 3.5 volts which is not enough to trigger relay. I need some help please to wire up a 9volt battery in a circuit.
[EDIT -> Actually I think I have this working , I have just just used the 3.5 volts from a parallel port to the emitter and base of a transistor, to switch on 6 volts going across the emitter and collector.)/edit]
Also I wish to use the port to receive analogue input from a potentiometer. I can read bits, bytes or words from the port with the software. My understanding is that a pot will change the voltage from about 0 to 5 volts but to the bare port this will mean nothing excepting it is still receiving the same signal.
So I need a way to convert the voltage change into something else,
like an on -off pulse, or I maybe could use a picaxe chip(when I get one, which is a scary thought when you look at my first question) to send something more detailed if I say got a chip kit and programmed it. Im just thinking out loud not sure here, but if anyone could help even saying these ideas are off track or on . It will be to use the potentiometer for position sensing.
thanks.