PWM (Pulse-width modulation) is a technique for controlling power to electrical devices, made practical by modern electronic power switches.
Questions tagged [pwm]
468 questions
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NuttX: How to add PWM support for STM32F7 boards? (stm32_pwm.h not found)
I'd like to add PWM support to my nuttx board config.
I am using an STM32F765VGT6 MCU.
I started implementing it like in the STM32F4Discovery config directory:
add stm32_pwm_setup() in configs//src/.h
add…
Hoeze
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Problems activating PWM output on PIC18F67K40 (MicroE clicker2 development board)
First time asking a question on here so please forgive any mistakes. If any other information is needed I'll happily provide
I've been developing a project which requires using a PWM module, but I'm having no luck whatsoever getting an output from…
DM501
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How do I configure the Beaglebone Black PWM correctly
I have tried to get PWM working and am not having any success. I am using the TI Processor SDK with a modified version of the am335x-boneblack.dts device tree (see below)
The PWM driver (ehrpwm1) probes correctly and appears in…
user8908459
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Phase shifted fringe pattern
I have created a fringe pattern for a structured light test like this one
(Binary pattern)
using a code snippet for generating a pwm signal in python
import numpy as np
import cv2
amp=float(input('fringe amplitude:'))
t=float(input('time…
Nikhil Shankar
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2 answers
ATTiny85 PWM for 4 LEDs
I need to control 4 individual LEDs via PWM on an ATTiny85. I have found lots of info on how to control 3 LEDs. But apparently to control 4 with PWM, you have to really twist the 85 into knots. Is there an easier way to handle 4 LEDs on the 85, or…
Muscle Nerd
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Wrong PWM pin output?
I am fairly new to programming, and as I have a fascination for music I thought to start with building a simple sequencer using codes from the web.
Now I found a perfect code but somehow it does not behave as it needs to and I hope to get some…
Jolie Smets
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Servo movement from side to side with PWM Arduino uploaded code
I'm using Arduino-Uno micro-controller with Adafruit servo shield. To move a quite fast 0.07 sec/60° mini digital servo motor with desired angle, for example from C# application:
myport.WriteLine(val.ToString());
I using PWM library:
pwm.setPWM(1,…
user8645307
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How to implement duties using PWM?
I have a microcontroller from based on an Evaluation Kit of Texas Instruments.
There is a vibration motor which is being activated with following code:
handle = ClipPWM_open(PWMI_MOTOR, &pwm_params);
PWM_start(handle);
uint8_t intensity =…
user8893205
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1 answer
Creating positive and negative values from PWM
I have the following simple system:
Where my triangle carrier is: (0,0) (0.0004,1) (0.0008,0).
The sine wave is: Amplitude 0.5, Freq 10(rad/sec) and Phase 10 rad
Then, I create a PWM inserting it into 2 transfer function and I obtain the following…
benb
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How to calculate logarithmic values in python for PWM controlled LED fading?
This is my attempt to do LED fading with my RPI using software PWM:
import time
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BOARD)
GPIO.setwarnings(False)
# set up GPIO pin for output
GPIOPin = 7
GPIO.setup(GPIOPin, GPIO.OUT)
# initialize PWM…
user3142695
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Achieve real 100% PWM DC by switching to I/O mode STM32F103
I am controlling DC motor with Infineon BTN (mosfet) and STM32F103 MCU, What I am doing is increasing PWM DC from 0 to 100 % in 10 secs, and after keep 100 % of DC. However 100 % DC is not 100% as you can see on scope there is a spike returning to 0…
Delphes
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PPM output is noisy when reading from sensors over i2c
Please excuse me for the lengthiness of the problem but its beyond my knowhow, I dont know where else to go.
I am trying to send a PPM signal to a FlySkyi10 radio over the trainer cable. When using the PPM code below I am able to send the correct…
Andreas Gerald
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What is the highest frequency the python software RPi.GPIO.PWM of the raspberry pi 2 is able to achiev?
I use the pwm to drive a steppermotor with microstepping. So as i increase the stepcount, i need to increase the frequency to match the same speed. Am i right?
Now my testcode looks like this:
import time
import RPi.GPIO as GPIO
DIR = 20 #…
Tobi
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IRQ interrupt is not get triggered
My Driver Code :
static irqreturn_t pwm_cnt_interrupt(int irq, void *data)
{
printk("==> %s\r\n", __func__);
return IRQ_HANDLED;
}
static int ecap_cnt_probe(struct platform_device *pdev)
{
pc = devm_kzalloc(&pdev->dev, sizeof(*pc),…
Karthikeyan Raju
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1 answer
STM32 Getting stable PWM Frequency and Duty Cycle
I have F401RB nucleo board Timer4 configured with these values
The PWM output varies considerably , frequency between 40kHz and 41.67 kHz and the duty Cycle between 50% and 52%.
Is there a way to achieve better stablity
With due respect to Sealese…
TonyP
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