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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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Using Pulse Width Modulation (PWM) interface in kernel module

I'm new in kernel development driver and I'm trying to develop a Linux kernel module, using the this module information: http://lxr.free-electrons.com/source/drivers/pwm/pwm-tiehrpwm.c But I didn't understand how to use it. How could adapt this…
dczanella
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Kernel module driver interaction

I'm new in kernel development. I'm trying to use PWM module from Beagle bone black board from another kernel module that I'm buinding. I have read these article: https://www.kernel.org/doc/Documentation/pwm.txt But it isn't clearly to understand. I…
dczanella
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Servo on an FPGA

I'm trying to make a servo work on my Spartan-6 based FPGA. my code is as follows: `timescale 1ns / 1ps /* 1 pin for servo--ORANGE CABLE red cable-- 5V, brown cable-- GND. Position "0" (1.5 ms pulse) is middle, "90" (~2ms pulse) is all the…
Cody Friszell
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msp430f2618 fading LED using pwm

I'm trying to write code in C to fade an off-board LED using PWM and the MSP430f2618. I can get the LED to turn on but it stays at full intensity. I am trying to read in an array of frequency values and fade the LED based on the frequency…
user3277932
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Arduino: Using analogRead() on Photoresistor to read LED with PWM

I have been working on a project with Arduino and have come across something that I find fascinating/confusing. So, I had to test something before constructing this project. I built a simple circuit that consists of just an LED and photoresistor.…
dts
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CPLD Breathing LED with flexible set points

This is my first post and my first attempt at using a PLD. I have written some code to make a breathing LED with 7 set points. The code produces a pwm output according to the first set point. It then slowly increases/decreases the pwm towards the…
Karl
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Controlling Fan Speed PWM on Raspberry Pi in Python

I am using Android app to control speed of the fan, by using above mentioned code I am using GPIO 24 with frequency 50Hz I want to change fan speed when i change it on Android app on run time I am using sleep function here, fan turns on, on…
Zain Sheikh
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synchronize ADC conversion and measure it in a specific part of a internal pwm signal

I need read my AD inputs only in a specific part of a internal pwm signal. My pwm has a period of 1 ms and initial polarity=low. I know that's possible to synchronize the AD conversion with a internal signal, I want to measure just in the high level…
Jeff Pal
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STM32F4 PWM and interrupt with the same timer

I have a STM32F407x. Is it possible to have a PWM Signal on a Pin and at the same time getting a timer interrupt if the UPPER value is reached? I tried the following code, but I only get once an interrupt (count stays at 1 forever if I use the…
HansPeterLoft
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Sample program for RPI 3 hardware PWM?

I am trying to use the RPI 3's hardware PWM pin. Is there a simple Bash script or C program that activates and controls the PWM pin?
kvu787
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Is NodeMCU's PWM limited to one frequency?

In the NodeMCU doc, it appears PWM on a pin may be set one of two ways, either through PWM or GPIO. In the PWM doc it says that if you set PWM on one pin for a certain frequency then that frequency is set for all other pins using PWM. This means…
cc young
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ATTiny85 PWM frequency

I'm trying to use the ATTiny85 to control a bunch of LEDs. The LEDs have to be run at around 2Khz ( this is so that it doesn't flicker when being filmed). How would I change the frequency of PWM signals?
Cat Beard
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Verilog: Using PWM to control the brightness of an LED

I am trying to make sense of this example code found here module LED_PWM(clk, PWM_input, LED); input clk; input [3:0] PWM_input; // 16 intensity levels output LED; reg [4:0] PWM; always @(posedge clk) PWM <= PWM[3:0]+PWM_input; assign…
Broadway
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Reading signal with interrupts using arduino

I am trying to read an input signal from a source that is a PWM signal. In my research I have found some useful articles out found here: http://www.instructables.com/id/Arduino-Frequency-Detection/?ALLSTEPS and here:…
paperstsoap
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Keep the memory to last value of the variable

I am using ESP8266 and i am programming it with Lua language. I created a PWM function and i created a server in ESP8266. I can change PWM duty cycle through this server(You can see figure). First i set to PWM with a default value and i am changing…
ahmd14
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