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Questions tagged [pwm]

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1answer
58 views

How to drive 12V servo motors using 5V PWM or 3.3V PWM using ARM MCU?

I have to drive several 12V servo motors. So I wanna to get 12V PWM Controller (12V Logic Controller). I have MCU as Atmel SAM3X8E arduino due board. It has 5V PWM outs. Is there any Controller IC ...
2
votes
3answers
207 views

PID control of a DC motor with PWM from Raspberry Pi - how to cross dead area?

I'm driving a DC motor (actually a linear actuator) with a Polulu motor controller from a Raspberry Pi. The motor drives if you ask for anything between 20 and 100% duty cycle, so there is a dead zone ...
2
votes
0answers
24 views

PWM to analog RC based filter with minimum analog voltage level

Trying to design a circuit to accomplish the following: 5V PWM signal is converted to 0-2.5V analog voltage The analog voltage should never drop below a certain minimum voltage level, when PWM is 0 ...
1
vote
1answer
316 views

How can I use a 5V pwm with a 12V pwm

I'm trying to control my 12V fan with a 5V fan controller. With this circuit the fan run at full speed. When I measure the voltage on PWM and ground I obtain 5V. Which circuit can I use to adapt the ...
0
votes
3answers
41 views

Applying PWM to get analog button

I am trying to understand how to turn a basic click button into something that behaves like a pressure sensitive button, meaning the harder you press it the greater the value. There are PWM modules ...
1
vote
2answers
4k views

Dc motors: relationship between PWM frequency and Torque

I am experiencing serious reduction in torque when using PWM to reduce speed - I'm temporarily resorting to 10Hz, and even then, 50% mark-space gives me (at most) half the torque of fully on. I'm ...