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 ~).
498 questions
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Use of 3 synchronized PWM pins on Arduino Nano
I try to use three PWM pins on an Arduino Nano, each with 10kHz. I know that there are timer0, timer1 and timer3 but I wonder if I can combine them while ensuring all three PWM pins to be in sync and ...
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2 votes
1 answer
219 views
ESP32 LED PWM fade not working?
Not sure if this belongs more in an electronics SE, but I'll give this a try. I'm trying to use an ESP32-C3 and an NPN transistor (2N5551) to PWM drive an LED (values below). I'm trying a simple fade, ...
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0 votes
1 answer
214 views
STM32 PWM on standard GPIO pins
I'm using an STM32F407ZET6 with the Arduino core support in PlatformIO. CPU has an external 8MHz crystal running at 168MHz. I have a project where I'm already using UART1, I2C1, SPI2 and SDIO (1Hz ...
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1 vote
1 answer
139 views
Problem with ATTiny85 sketch to start and stop firing a camera on a PWM signal from RC receiver
I am trying to start a camera firing at a fixed interval on a long servo pulse, stop it firing on the next long pulse, start it again on the next long pulse, etc. I use an interrupt to detect if the ...
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1 vote
1 answer
115 views
Arduino Mega 2560 + DRV8871: Motor Not Moving with PWM Control
I'm using an Arduino Mega 2560 to control a DRV8871 motor driver connected to a DC brushed motor. The setup includes: Three buttons: UP, DOWN, and FAST One limit switch input, where the upper and ...
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1 vote
2 answers
100 views
Translating PIC PWM settings to ATMega328P
I'm trying to get some C code that runs on a PIC18F, working on an Arduino '328P. It uses an 8-bit timer, PWM, and a LUT to generate sine waves. I hope to get it going using Timer2 on a Nano. The PIC ...
- 269
1 vote
1 answer
160 views
Does changing the prescale for Timer 0 or Timer 2 affect the micros() function?
I am using an ATTiny88 to drive a PWM device. First of all, digging through the literature, it's hard to tell what the differences between the ATTiny85 and ATTiny88 are, and the vast majority of ...
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-1 votes
2 answers
218 views
I need two (25 and 30 kHz) pwm output on a nano
How do I create a second output with a different frequency? void setup() { const byte DRIVEa = 3; // Timer 2 "B" output: OC2B pinMode (DRIVEa, OUTPUT); // driver a. TCCR2A = _BV (...
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1 answer
47 views
Does an ISR pause PWM?
I have a Nano producing a PWM output from one of its pins. This PWM signal cannot stop as it drives a filament for a VFD display(if it stops, nothing shows). However, I need to capture the pulses from ...
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0 votes
2 answers
269 views
Translating analogWrite() into PWM duty cycle formula
We can use the function analogWrite(int x) for digital pins which support PWM because any microcontroller has a built in PWM generator.For given x and for Arduino Uno which is the formula to calculate ...
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1 vote
1 answer
68 views
What prescaler to use for finer control?
I'm using a UNO to generate a 10 kHz PWM signal. I need finer duty cycle variation. The prescalers supported are 1, 8, 32, and 64. void setup() { pinMode(3,OUTPUT); TCCR2A = bit (WGM20) | bit (...
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2 answers
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I need a 10KHZ PWM signal from pin 3 and 11 using timer 2
The op of pin 11 should be inverse of pin 3. I used digitalreadfast and digitalwritefast and used simple if else. But the delay is high as 10us. What should i do? I found this code in forum but its ...
-1 votes
1 answer
175 views
Unable to find PCA9685 module when using the I2CScanner library: no servo movement
I am trying to use an Adafruit PCA9685 servo driver module with an ELEGOO Mega 2560 board. I am supplying the servo driver board with 5 V and tested all the wires to make sure. I tested the servo ...
-1 votes
1 answer
167 views
How to output two PWM signals, one of 50% duty cycle, the other 25% duty cycle, from an Arduino Uno?
I need to output two PWM signals, one of 50% duty cycle, the other 25% duty cycle, from an Arduino. Feed both signals into the 2 channels of a PicoScope and measure: a) the time difference between the ...
0 votes
1 answer
109 views
Use TCC1 timer to generate PWM on personnal board built with SAMD21E18A
I'm trying to generate a PWM signal from TCC1. I have a personnal board built with SAMD21E18A. I want to use pin 27 PA30, in my variant.cpp I have this line: { PORTA, 30, PIO_PWM, PIN_ATTR_DIGITAL|...
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