PWM on Pin 4 - arduino Micro

Question

I am using Arduino Micro. Is there any way to use PWM on pin 4 instead of Pin3 ?

I tried to change pins_Arduino.h but didnt worked.

//#define digitalPinHasPWM(p)         ((p) == 3 || (p) == 5 || (p) == 6 || (p) == 9 || (p) == 10 || (p) == 11 || (p) == 13)

#define digitalPinHasPWM(p)         ((p) == 4 || (p) == 5 || (p) == 6 || (p) == 9 || (p) == 10 || (p) == 11 || (p) == 13)

and

const uint8_t PROGMEM digital_pin_to_timer_PGM[] = {
    NOT_ON_TIMER,   
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    ////////////////////////modified///////////////
    //TIMER0B,      /* 3 */
    //NOT_ON_TIMER,
    NOT_ON_TIMER,
    TIMER0B,        /* 4 */
    ////////////////////////////////////////////////////
    TIMER3A,        /* 5 */
    TIMER4D,        /* 6 */
    NOT_ON_TIMER,   

    NOT_ON_TIMER,   
    TIMER1A,        /* 9 */
    TIMER1B,        /* 10 */
    TIMER0A,        /* 11 */

    NOT_ON_TIMER,   
    TIMER4A,        /* 13 */

    NOT_ON_TIMER,   
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,

    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
    NOT_ON_TIMER,
};

@Majenko has answered your question. What many do not realize is that there are many Aruidno boards with a number of different processors. It is difficult to make them all work alike. That is, using the "Arduino set of software" (Libraries, boot loaders, ect), it is difficult to abstract the hardware to make all Arduino boards act exactly like the original Arduino Uno. I think you can do what you want on an Arduino Mega board. — st2000, Commented Sep 10, 2017 at 14:05
i am willing to modify the abstraction layers. Just want to make sure that it will work if i modify the libraries — Sanu - Open Maker, Commented Sep 10, 2017 at 14:56
You need to understand both the hardware and software before starting. It may be that no matter what you do there isn't PWM hardware on pin 4 of the micro you are using. However, if you understand what you goals are you may be able to implement a software PWM. But, likely, you would have to use interrupts for timing. And that might interfere with other Arduino features / functions. At some point it may just be easier to use a more feature rich micro. Especially if this is a one off project. — st2000, Commented Sep 11, 2017 at 0:04

Majenko · Accepted Answer · 2017-09-10 12:42:01Z

1

You cannot. There is no PWM on that pin. PWM is generated by hardware. The hardware simply does not exist.

answered Sep 10, 2017 at 12:42

Majenko

106k5 gold badges81 silver badges139 bronze badges

even something slimier to 'Software Serial' not available?
– Sanu - Open Maker
Commented Sep 10, 2017 at 14:55
Software PWM is possible but quite intensive. Servo.h does it but only for very low duty cycles.
– Majenko
Commented Sep 10, 2017 at 14:57
my intention is to control a dc motor driver(TB6612FNG) that needs PWM inputs
– Sanu - Open Maker
Commented Sep 10, 2017 at 14:58
You get glitches is software PWM which makes it a poor choice for motor control.
– Majenko
Commented Sep 10, 2017 at 14:59
sad to hear that, and thank you so much for your support
– Sanu - Open Maker
Commented Sep 10, 2017 at 15:00

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