#define PINA 9
#define PINB 10 // Can be any digital pin. if using NUMPWM = 1
In fact pin 10 is also a pwm enabled pin on the Arduino UNO.
If you use a pure digital pin such 4 or 7 the example does not run as expected: the speed of the motor doesn't increase/decrease smoothly but change only between stopped and full speed.
The code in the library shows that in the case 1 pwm pin/slow_decay we still have an analogWrite on PINB: this will be equivalent to PINB set to 0 for pwm values \< 128 and set to 1 for pwm values > 128 if PINB is a pure digital pin.
In case of the UNO where pwm pins are scare resources, the 1_pwm mode may be useful, even if forward/backward spinning are not handle the same (SLOW_DECAY in one direction, FAST_DECAY for the other one)
FAST-DECAY/1 pin is OK (with the previous limitation)
Don't know if this library is maintained. If need be, I can try to make a pull request...
The configuration with SLOW_DECAY mode and only 1 pwm pin doesn't run as expected.
The documentation states:
The example Mx1508Sample.ino, used also in the demo https://www.youtube.com/watch?v=jntVTbv9dD0&t=196s, using SLOW_DECAY and 1 pwm pin (NUMPWM = 1) contains
In fact pin 10 is also a pwm enabled pin on the Arduino UNO.
If you use a pure digital pin such 4 or 7 the example does not run as expected: the speed of the motor doesn't increase/decrease smoothly but change only between stopped and full speed.
The code in the library shows that in the case 1 pwm pin/slow_decay we still have an analogWrite on PINB: this will be equivalent to PINB set to 0 for pwm values \< 128 and set to 1 for pwm values > 128 if PINB is a pure digital pin.
In case of the UNO where pwm pins are scare resources, the 1_pwm mode may be useful, even if forward/backward spinning are not handle the same (SLOW_DECAY in one direction, FAST_DECAY for the other one)
FAST-DECAY/1 pin is OK (with the previous limitation)
Don't know if this library is maintained. If need be, I can try to make a pull request...