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Questions tagged [pwm]

PWM (Pulse-width modulation) is a technique for controlling power to electrical devices, made practical by modern electronic power switches.

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PWM for LED dimming unusual behavior

I made a function, where PWM signal is generated at the output (PORTD) without usage of PWM control registers inside PIC microcontroller (PIC18F452). In order to slowly dim LED connected at the output, I was trying to increase the time needed for…
Keno
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How to test a RGBLED without Raspberry Pi connection?

I was working with gpiozero and wanted to use the MockFactory to debug on a local device without Raspberry Pi (4) connection. The last time I used the Mockfactory was with an gpiozero.LED object. But this time I used a gpiozero.RGBLED output device.…
Mistel_Panda
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Microchip dsPIC33 Start all PWMs at same time

Using dsPIC33CK256MP508 on the Curiosity board. Trying to run 4 PWM generators in high resolution mode. I will run them in single cycle mode. Trying to figure out how to kick off all 4 signals at the exact same time, or trigger them from the same…
kjav
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PWM "Pulses" w/ MSP430

I am trying to develop a delay generator that can generate 50 "pulses" within a short amount of time and then hold for a much longer time, then repeat. I am familiar with using the MSP 430 as a constant PWM source, but I am not sure what the best…
CLand
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STM32F4 PWM Buzzer Stops Playing Halfway Through Song

I am trying to write code to play simple songs using a STM32F407G discovery board and the STM32CUBEIDE. I created an array to store the note frequency values and also one for their duration(not 100% accurate yet,just wanted to test a concept). I…
Altus Cilliers
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STM32 Difference between Max interface clock and max timer clock

I am using TIM1 on a H743ZI with 3 PWM channels. I am trying to maximize the PWM resolution so I need to maximize the clock speed on TIM1. the datasheet (screenshot below) gives 120MHz and 240MHz values for Max interface clock and Max timer…
zytra
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How to make DMA work for changing the duty cycle of a PWM port using Rust?

I'm trying to change my PWM duty cycle every period from a stored buffer using a DMA. It's something very close to this topic but the code is now a little bit outdated. I'm also using the stm32l4xx_hal implementation for my project. What I have for…
Aurelien Montmejat
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RPI Zero - Bare metal - PWM

I try to produce a PWM on a RPI zero pin.. it's a bare metal c code I try to have a pulse on pin 13, I tried many different codes, none of them work while I can use GPIO's, SPI and UART without problem so the bootloader works I also tried to put the…
Phil123456
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PWM using bcm2835 library as non-root in Raspberry Pi

I need to control some DC motors using PWM. I have been trying to use the bcm2835 library, but I need root access to run my program. I need to avoid this, as this program is part of a ROS package, which gives problems if run as root. I have tried to…
lortane
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Calculate Continuous servo PWM Frequency and duty cycle

im using a Raspberry pi 2 2 x DS3115-360 servos Im trying to get the frequency and duty cycle working correctly but I cant find the data sheet on this servo. I tried the typical 50hz 7.5 dc but it does not seem to be working for me. I tried…
SqueakyDeath
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How do I get this simple PWM example to work?

I am just starting to work with the MSP430 microcontrollers after previously only working with STM32, and as I am still a beginner with all of this, the change is quite a lot, but I am struggling to get a simple PWM output working. At the office,…
MCG
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Generate a fixed number of pulses on the STM32F4 PWM

I am trying to control a servo motor (link). It is a brushless DC motor with an interface similar to a stepper motor. The motor rotates for a defined distance based on the number of pulses it receives from the PWM. The speed is determined by the…
Eduardo Cardoso
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SAMD21: how to set PWM using TCC?

I'm programming a SAMD21 and I need PWM. When I chose pin with F function TCC0 output: PA22 - TCC0/WO[4] PA23 - TCC0/WO[5] I successfully configured TCC0 base counter: // enable clock for TCC0 - disable clock masking PM->APBCMASK.reg |=…
EFK
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How can I change LED's brightness with PWM and USART in USART1_IRQHandler?

I am using STM32F4 discovery board and I am working on changing LED brightness and timer period using ADC and USART. I use DMA to fetch ADC values, selected TIM4 for PWM and selected USART1 for USART. ADC, USART and PWM are working well so far, but…
Furkan Güngör
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ATMEGA32U4 PWM issue

I am developing a simple program to run a buzzer in AVR on a Teensy 2.0 (ATMEGA32u4) and I am having great difficulty getting the PWM output to work. The PWM output is on PB6 and I can test it digitally so I am not worried about the hardware setup…
Thomas Hulbert
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