hand proximity speed controller for a small dc motor

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cedrick1988

Joined Oct 9, 2011
1
Please help me with the design of this speed controller circuit.what kind of sensor can I use other than an LDR to control the speed of the motor so that the farther the hand from the sensor the faster the speed and the closer the hand to the sensor the slower the speed of the motor.Basically the function of the unit is to control the speed of the motor as a function of the distance of an operator's hand from the sensor.The rotation should stop when the operator's hand is approximately 2 cm from the proximity sensor.
I'm using an LM358 or LM741 op-amp, resistors, capacitors, transistors, it is all analog no programmable devices.
 

Bernard

Joined Aug 7, 2008
5,284
Check net for " Pololu" ; they carry optical range finders covering various ranges as, 10-80 cm, 20-150 cm & 4-30 cm. Last at about $12. Output is analog voltage.
 

Bernard

Joined Aug 7, 2008
5,284
To go with range finder, try Sgt. Wookie's voltage controlled PWM ckt with H Bridge to match motor; note: if direction control is not needed, then just a driver & not an H-Bridge is needed.
 

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