Questions tagged [pwm]

PWM is a form of signal modulation that allows digital output to approximate an analog signal. Use this for questions about using the PWM pins (marked with ~).

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29 views

Arduino, generating smaller frequency than 31Hz

I'm controlling a car instrument panel with Arduino using the tone() function, however with Arduino Uno's minimum 31Hz frequency I can only set the speedometer at ~12mph or more. I'd like to be able ...
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1answer
43 views

First I2C project - Unable to get any servo movement with PCA9685

I'm working on a project where I need to run multiple servos. For now though, I'm trying to get a single MG90S servo running with a PCA9685 servo driver but I'm unable to get any movement from the ...
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0answers
47 views

Variable frequency PWM, without changing timers

I need variable frequency output - 0-5000Hz with some duty cycle. I do not want to change timers, because I am using delays, serial and CAN, so I do not want them to be affected by changed timers. I ...
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1answer
94 views

Seeeduino XIAO write and read PWM duration (period) using timers

I am trying to communicate between two Seeeduino XIAO (chip: ATSAMD21G18A-MU) by way of TCC capture using register timers. Square wave pulse duration varies from 200ns to 4us. I found these two code ...
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0answers
65 views

Is a PWM phase duration set with OCR1A a reliable way to communicate values to other Arduinos?

I am working on communicating 4 switch states across multiple Arduinos using only one pin. It must be as fast as conceivably possible. Currently I have a master Arduino reading all 4 switches (...
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0answers
32 views

Control output of XL6009 Boost converter with Arduino

I wonder if someone could help me with figuring out how to control XL6009 Boost converter via Arduino. I have this popular board, and it has potentiometer to adjust the output voltage. However, I want ...
1
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1answer
23 views

MC33926 Brushed Motor Driver (Shield/Carrier)

How can I use a MC33926 Motor Driver like it is offered for Arduino to drive forwards, backwards with a PWM and a direction control. The problem is that the MC33926 has Inputs IN1 and IN2 and not PWM ...
4
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1answer
47 views

How do you get 2 PWM pins to inversely bitbang at 25 KHz on a Nano?

I need 2 PWM pins to oscillate at 25 KHz but they need to oscillate inverse to each other. When one is high, the other must be low and vise-versa. I want to do this with a Nano.
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1answer
43 views

L298N motor controller board EN pins

For this device are the enable pins meant to be connected to PWM pins? If so then how am I able to use this device with an arduino uno? The uno does not have any pwm pins right?
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0answers
47 views

Writing multiple inputs to serial port using a while loop

I am trying to get the serial monitor to prompt me to input two settings - the PWM level and the Resonance level. I am being prompted to input the PWM level, but before I can input the Resonance level ...
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0answers
15 views

How to correctly measure the duty from an interrupt that is used for counting

Trying to get the duty cycle % from an input (pin27) on my ESP32 that is currently used for analog input to read out the voltage provided by a GM driver. Anybody has an idea on how could I achieve ...
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1answer
80 views

DC Motor Acceleration with PWM

I'm not sure why this has been so difficult for me, but I'm trying to control the acceleration of a 10v DC motor with an Arduino UNO and an L298n H-Bridge. Using a 12v regulated power supply to power ...
3
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1answer
295 views

Can’t set duty cycle to 0% with custom PWM

I'm trying to control a heating element with PWM with an Arduino Nano, but the problem is even if I set the duty cycle to 0 it gives a tiny spike. I want to generate a square wave of 1Hz and that's ...
3
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1answer
83 views

Fader OOP Problem

This code works and it can fade three LEDs without any problem, obviously you can even add more of them : ) // Pins Definition const int button1 = 13; const int button2 = 12; const int button3 = 11; ...
2
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1answer
61 views

How can I read the Timer direction in phase correct PWM?

I have had to use Timer0 with phase correct PWM and a prescaler of 1. This results in a 32khz PWM frequency and obviously impacts millis, delay and micros. (Timer1 and Timer 2 are also in use so ...
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1answer
27 views

Arduino on/off PWM

When I turn on DC motor with a button I get a a fixed PWM value that goes into a loop till button state changes. What should I change that I could change X value with potentiometer in a loop? int X = ...
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0answers
27 views

Using 4x1 MUX to control a servo

I was supposed to first create a 4x1 MUX using AND and NOT gates. The 4 input data lines (io,i1,i2,i3) were 4 PWM pins from the arduino (3,5,6,9), with analogWrite() values as 100,150,200,250 ...
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1answer
137 views

Driving a servo with an ATTiny13A

So, I managed to fry my cheap servo/ESC (electronic speed controller) and decided to make my own using an ATTiny13A on some perfboard. But, I have run into some issues getting the servo to respond. I'...
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0answers
23 views

Generating Externally Triggered Complimentary PWM with Arduino Due

I need a 2KHz complimentary PWM waves with adjustable duty and phase that is triggered by an external 4KHz source. After reading the datasheet I think there might be 2 way to do this: Use a TC unit ...
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1answer
183 views

Arduino simulator - generating sine wave from PWD (Oscilloscope read is rectangular)

trying to create this simple circuit where a rectangular voltage input is transferred to a sine wave output. the process is quite simple, but I couldn't see the actual sine wave when connecting an ...
2
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1answer
66 views

How should I decide the cut-off frequency for my low-pass filter?

I'm trying to generate some basic thumping stereo sound using Arduino's PWM pins along with low-pass filters. This is the frequency spectrum for the sound I want to play using Arduino UNO's PWM pins: ...
2
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1answer
290 views

Fast PWM with Arduino, the inputs outputs don't work

Hello to the community! I am using ATTINY85 and I am programming it through the AVRISP using an Arduino UNO. This is the code I am using : #include <avr/io.h> #include <avr/interrupt.h> ...
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1answer
50 views

Using PWM pins on the UNO to generate Stereo Sound

I am trying to generate stereo sound using an Arduino UNO. Instead of using a separate DAC chip (as shown here), can I use the PWM pins on the UNO along with a low-pass filter? Also, would I need any ...
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2answers
67 views

PWM and Analog Signal Quality

I'm converting a 0-5v PWM signal to an analog signal using an LM358D. I've connected the output to an oscilloscope to look at the signal but I'm not really sure what I'm looking at. The PWM looks ok ...
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1answer
19 views

Change character sequence

I turn on the transmission of one key that works to open the door, but after a certain time I need to close the door, and for this I need to use the second key. I want to do without additional buttons,...
1
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1answer
34 views

Rotating Servo Motor using Arduino

Using arduino, I'm trying to rotate a 360 servo that will move clockwise 5 seconds,pause and counterclockwise for 5 seconds and then completely stop. However, my servo just continuously keeps on ...
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0answers
61 views

l298N PWM motor control with Uno is not functioning correctly

I'm working on a self-balancing robot. The self-balancing is not the issue. The issue is that the motors don't respond as they are supposed to. I would understand if it were unable to balance, but the ...
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0answers
35 views

Trouble with laser sensor

I have trouble with my laser sensor it doesn't work properly. When I connect all pins its doesn't work, when I remove GND and connect just the signal pin and VCC it works but the laser light is dim(I ...
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1answer
42 views

I have a problem trying to limit motor speed to a certain RPM using a MOSFET trigger switch module

I am using the potentiometer to control the duty cycle of a PWM signal to the MOSFET trigger switch module, thus controlling the motor speed. In my code, I have used the map function to utilize the ...
2
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1answer
37 views

Can Arduino uno adjust input square wave duty, phase and frequency with just timer-counter?

Requirement: I have input 4KHz pulse input Divide it's frequency in half Arbitrarily adjust phase Arbitrarily adjust duty Out put the modified pulse My solution (CPU): uint8_t cnt = 0; uint16_t t1 = ...
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1answer
60 views

Problem with sending IR with at ATMega328P-PU

I have a sketch that sends an IR code every second. It works fine (the correct code is received by my receiving Arduino next to it) on the Arduino but when I try to move the sketch to an ATMega328P-PU,...
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6answers
3k views

Is it possible to generate an exact 15 kHz clock pulse using an Arduino?

I want to generate a 15 kHz pulse with an Arduino using Timer1, but the problem is that if we want a 15000 Hz clock we need to initialize the timer with 1/15000 seconds or 66.66 microseconds, but we ...
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1answer
91 views

Weak Arduino Output Pins

Sorry if this is a newbie question, but I'm really struggling with this and I can't seem to figure it out. I've been learning Arduino for a while, and for my next project I'm attempting to build a ...
3
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1answer
51 views

(Arduino Uno) PWM output (and servo plugged on it) becomes unstable if I use 1Wire on another pin

Unnecessary context but hey I'm guessing you might be interested Hi, I want to build a PID temperature regulator with a servo that presses on a silicon pipe to adjust the flux of liquid passing ...
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3answers
119 views

Arduino Pro Mini PWM issue

I want to create a small LED strip driver/controller with 2 channels (Cold/Warm white) using Arduino Pro Mini (5V/16MHz). I have connected the parts per the following diagram I have pins 5 and 6 ...
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0answers
38 views

I need to change a library to output on pin 3 instead of pin 11(It involves PWM and timers on the arduino)

I read into how the timers on the Arduino work, and I know that pin 3 is OC2B and pin 11 is OC2A. I tried to understand the datasheet and changed the code a bit, but nothing I did worked. This is the ...
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1answer
44 views

Always HIGHT line on Oscilloscope when UNO's Fast PWM TOP ICR1

I have been trying to get an answer my question for a 2 days already. It's good for knowledge collecting and playing with different things, but there haven't been a solution so far. I'm trying to ...
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1answer
53 views

How the light brightness stays constant when we increase the frequency of stroboscope

Well I am trying to make a Stroboscop. I found this code at blow: and tried. It works normally. But if I increase the RPM so decrease the "strobeDelay" time, the brightness of the LEDs goes ...
2
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1answer
105 views

Arduino Wifi Rev2, bug when reading PWM duty cycle value on pin 6

I am trying to read the PWM duty cycle set for pin 6 on the Arduino Wifi Rev2. By default, the timer used is TCB0, used in 8-bit PWM mode. The 16-bit Compare channel CCMP is used as two 8-bit ...
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2answers
173 views

Dimming this ~30V led with PWM, what do I need?

I have a street lamp with a led and simple driver in it, I don't know the exact led voltage but the driver (image attached) says 27-36V DC output, MODEL: 50W. Is there a part I could place between ...
2
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2answers
95 views

Is it possible to have long wire connections from an NodeMCU to a servo motor or button?

For my proyect, I need to conect my NodeMCU to a servo motor as well as a push button, the thing is, the distance from the NodeMCU and both components has to have a distance of around 6.10 meters (or ...
2
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0answers
30 views

Brushless motor vibration/jitter/noise - arduino uno

I am currently using these motors and driving them off these drivers and an arduino uno, and alternatively trying to make them turn using the setup in step 6 (both with l298n and without) in this ...
1
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1answer
41 views

How can I PWM 4 LEDs from 0 to full brightness using a two axiz resistive joystick?

I am trying to use the Arduino MAP function to allow me to PWM 4 LEDs between 0 and full brightness. I guess the tricky part is that the joystick neutral position is at the venter of the range of the ...
0
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1answer
94 views

Deriving the exact relationship between PWM and steering

I am using a L298n driver to make a basic RC car. I realise that PWM is used to control the speed of the motors and that the car would turn when the wheels on one side of the car have a rpm different ...
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0answers
116 views

LEDs lighting up when off due to servo motor being on

Within my arduino project I have began to run out of GND ports on my arduino so I am having to resort to using 1 GND port for lots of electric components. I have 2 LEDs that are each connected to a ...
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1answer
266 views

Can't turn off fan using PWM and analogWrite(x, 0)

I'm trying to make PWM Signal Generator with Arduino Uno. I'm trying to control 230V 50hz "NRG118" combi boiler fan. The fan powered by AC and have 3pins for PWM control. "vcc,gnd,pwm&...
0
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1answer
60 views

Can I use this camera switcher?

I am wondering can I use this bicks camera switcher with the arduino since it uses a PWM signal. If i can do I just put it on one of the PWM outputs or do I need to wire I add something to make it ...
2
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2answers
85 views

Switched from 3ft to 10ft connection wires. My setup doesnt run correctly now. Timing issues?

Running a DC motor(6.5A max input), motor driver (MD10C 7Amp peak output), and Arduino Mega. I am stabilizing an object with an accelerometer as my sensor. I switched to longer wires so I can have my ...
3
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5answers
3k views

How do I convert 0-5v PWM to a 0-12v PWM

I have a Arduino which I would like to use to control a 12v PWM fan for speed control. I know about the 0-3.3v to 0-5v logic level shifter, is there a similar option for 0-5v to 0-12v? Or is there a ...
2
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1answer
76 views

How to use PWM with DRV8870?

I'm using Arduino nano and I'm struggling working with the DRV8870 IC on PWM mode. When I use analogWrite(_pin, duty_cycle); the motor makes weird noises. I thought it's because of the PWM frequency ...

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