Mike said:
Russlk said:
Using a servo motor to turn a dial that could have been turned by hand seems really stupid.
Russel,
Shame on you... Ham operators do this all the time... They put stepper motors (and limit switches) on large variable capacitors in a tuner that needs to be mounted at the base of an antenna in their back yards to allow remote control of the tuner from within their "radio shack"...
Kind regards, Mike
you must be thinking old style there :lol:
We now are in 2006.
Forget about hooking up a motor to a control knob. Like Russlk said, it is stupid. Also, it is more expensive and more risky. Instead, you need a DAC. A DAC stands for
Digital to
Analog
Converter.
What it does is convert a binary number (a number consisting of only 1's and 0's) to a voltage. The output of this voltage can be used to drive an H-bridge (a circuit that allows a motor to work with any circuit) and therefore drive a motor.
a DAC can be bought as a chip, or you can be like me, and make one yourself.
Also, take resolution into consideration. The higher number of bits you have in your DAC, the finer the resolution, and it will act as if it was a super-linear control, so linear, you wouldn't have done it with your setup of driving a knob with a motor.
and one more thing, a DAC, whether made by yourself out of discrete components, or using a DAC chip will take up A LOT LESS space than your current setup.