![]() I am actually able to achieve 22kHz on pin 10 but I am not able to get 2Hz on pin 6. TCCR4A = _BV(COM4A0)| _BV(WGM41) | _BV(WGM40) // CTC, toggle OC4A on Fast PWM TCCR4B &= ~myEraserDir // this operation (AND plus NOT), set the three bits in TCCR4B to 0 Int myEraserDir = 7 // this is 111 in binary and is used as an eraser ![]() TCCR2B &= ~myEraserPulses // this operation (AND plus NOT), set the three bits in TCCR2B to 0 Int myEraserPulses = 7 // this is 111 in binary and is used as an eraser This is the code I used: const byte PULSES = 10 // Timer 2 "A" output: OC2AĬonst byte DIR = 6 // Timer 4 "A" output: OC4A I decided to use my ARDUINO MEGA 2560 to provide PWM output through channel 10 (using Timer 2) to get 22kHz and through channel 6 (using Timer 4) to get 2Hz. I am actually going to command a stepper motor using two square waves of 50% duty cycle on the two pins of PULSE and DIRECTION.įor those i need 22kHz on the PULSE pin and 2Hz on the DIRECTION pin. I am Alessandro and i am passionate about electronics so sometimes I run some mini projects as hobbist. The animation given below shows Proteus simulation for variable duty cycle PWM signal from Arduino pin D10.I am new in this community. PinMode(A0,INPUT) /* ser pin A0 as a input pin */ PinMode(pwm_pin,OUTPUT) /* set pin 10 as a output pin */ *two interger type variables to store digital value and duty cycle value */ This code generates 0-100% variable duty cycle with the default frequency of D10 pin of Arduino. Also, connect an oscilloscope to D10 of Arduino.Ī=analogRead(A0) /* take analog sample from A0 and store result in variable 'a'*/ī= map(a,0,1023,0,255) /* map the digital value to duty cycle range 0-255 */ĪnalogWrite(pwm_pin,b) /* generate pwm signal on pin10 with duty cycle value of b */ Make connections with Arduino and POT according to this schematic diagram. In other words, we will map the digital value measured with analogRead() function into duty cycle. To control duty cycle, we will use a potentiometer with analog channel zero of Arduino. ![]() We will use D10 pin of Arduino to get output signal. In this section, we will learn to generate variable duty cycle PWM. } Proteus Simulation Output Variable Duty Cycle PWM Arduino ![]() TCCR1B=_BV(WGM13)|_BV(CS11) /* Activate PWM Phase, frequency correction Mode */įloat frequency=0 /* initially set frequency to zero */ TCCR1A=_BV(COM1A1)|_BV(COM1B1) /* set Fast PWM Mode */ PinMode(outputpin, OUTPUT) /* set as a output put */ * Perform initialization and declarations inside setup() */ void loop()Ĭomplete Code int outputpin=9 /* Assign symbolic name outputpin to D9 PWM pin of Arduino */ The value of frequency gets updated on the PWM pin after every one second. The potentiometer which connects with analog channel zero (A0) of Arduino is used to control set the frequency of the PWM signal. 0.0113 is a factor that restricts the count variable in the range of 10000 to 100000 which results in a frequency range of 10 Hz to 100Hz. Similarly, analogRead() functions reads 0 when voltage is 0V. The analogRead() function reads 1023 when voltage is 5V at the analog pin. Inside the loop() function, the value of OCR1A is being calculated stepwise according to the required frequency formula given above.
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