Without further ado, let’s get right into it! Table of Contents This tutorial will help you fully understand it and apply some practice examples and projects on your own. Pulse Width Modulation ( PWM) is a fundamental topic in Embedded Systems and Arduino programming for electronics. We’ll start from the basics of PWM signal, its frequency, duty cycle, and resolution, and discuss in detail how it works and how to use it in various Arduino control projects. If the servo does not jitter in that setup, then I no longer suspect a power issue, and the issue is most likely code related.In this tutorial, you’ll learn how to use Arduino PWM analog output pins using the analogWrite() function. I do not see any code that controls a servo in your sketches, but to try to address the issue of servo jitter, I recommend you simplify your system and try controlling your servo directly from an RC receiver while supplying power to it from your new 2A regulator. Additionally, you might also double check that the serial monitor’s baud rate is set to the same baud rate you are using in your sketches (9600). Using Serial.print() will send the appropriate ASCII representation of cmd to the serial port so that you can read it. ![]() Serial.write() will send the raw binary value of cmd to the serial port, which the serial monitor is (wrongly) interpreting as an ASCII character, which is why you are seeing those strange characters. Second, Serial.write(cmd) should be Serial.print(cmd). I suspect that information is not what you want to print. First, Serial.println(bluetooth) is trying to print the value of bluetooth which is an instance of SoftwareSerial what this ends up doing is converting the SoftwareSerial object to a boolean value (indicating that the serial port is available) and printing the boolean as “1”. ![]() I see two issues with your serial debugging code. But unfortunately as soon as I connect the servo PWM-line of the servo to Pin 3, all conrols are down. I tried to implement the code (as you proposed without the loop and with the “servoSetPosition”-function. TIMSK2 |= (1 << OCIE2A) // enable timer compare interrupt ServoHighTime = highTimeMicroseconds * 2 TIMSK2 &= ~(1 << OCIE2A) // disable timer compare interrupt Void servoSetPosition(uint16_t highTimeMicroseconds) TIMSK2 |= (1 << OCIE2A) // Enable timer compare interrupt. Put the timer in a good default state. We've hit the end of the period (20 ms), The pin has been high enough, so do a falling edge. Check to see if is time for a falling edge. because the timer value will equal OCR2A before going to 0. The time that passed since the last interrupt is OCR2A + 1 after the rising edge will be smaller so we can achieve interrupt every 128 us, but the first two interrupt intervals Generally we will set OCR2A to 255 so that we have an In this ISR, we set OCR2A in order to schedule when the next ![]() This ISR runs after Timer 2 reaches OCR2A and resets. ServoSetPosition(2000) // Send 2000us pulses. ServoSetPosition(1000) // Send 1000us pulses. This is true if the servo pin is currently high. This is the pulse width we want in units of 0.5us. This is the time since the last rising edge in units of 0.5us. Thanks for your reply! I plan to do it like you proposed, but do I have to implement all of this? // This line specifies what pin we will use for sending the PinMode(led, OUTPUT) //connect here the blue LED Serial.begin(9600) // set up Serial library at 9600 bps - this is the speed the serial interface will work all According to the Pololu schematic, the pin 3 is not used for communication between the shield and the Uno. ![]() With both the motors don’t repsond to the incoming commands. I tried the “myservo”-library and the “servo”-library. All the motor controls work fine until I attach a servo to pin 3 (or to other pins). I have a Pololu VNH5019 connected to a Arduino Uno.
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