Questions tagged [pwm]
8 questions
3
votes
1 answer
High Fan Speed Not Cooling As Expected (PWM, Arduino)
We have a system involving a fan blowing air through a box which contains a small (but constant) heat source and a temperature sensor. The fan speed is controlled with PWM.
As PWM (and hence fan speed) is increased, the temperature is initially…
Jago Aartsen
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2
votes
1 answer
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 available for this task?
ISURU THIWANKA
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2
votes
3 answers
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 between -20% and 20% duty cycle.
I'm using a…
Peter Greaves
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2
votes
0 answers
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 or filtered PWM signal results in a voltage level…
Ibraheem
- 121
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2
votes
1 answer
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 5V PWM on the 12V PWM ?
zedzedz7efzze
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1
vote
0 answers
pca9685 alternative
As chip shortage continues, it is harder to get the above mentioned IC.(used to drive various LEDs )
I struggle to find an alternative based on the points mentioned below, maybe someone encountered some similar IC ?
Main points would be:
I2C -fast…
Miaso
- 11
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1
vote
2 answers
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 assessing the torque by seeing what weight can be…
CL22
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0
votes
3 answers
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 that you can use to get different current but I am…
user1610950
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