The schematics doesn't show the second relay to stop the motor and hopefully I won't need it. Does anyone here have any ideas on how to do it in the code rather than adding more hardware? I uploaded the schematics for the circuit I'm going to use below. I got it working with a SPDT relay by wiring pin 9 of my Mega 2560 to the common of the relay and then from the normally closed contact of the relay to my mosfet then I just powered up the relay when I wanted to stop the motor. I came up with a way to do it using another relay. I did read the documentation previously and my understanding that on an Arduino Uno, pins 9 and 10 are disabled for analogWrite. I tried writing code to shut it off but couldn't get it to work because I don't have very much savvy of the inner workings of PWM. analogWrite() pin: PWM may be used on pins 0 to 16 value: should be in range from 0 to PWMRANGE, which is 255 by default. Which pins that affects depends on which Arduino you have. After a call to analogWrite(), the pin will generate a steady rectangular wave of the specified duty cycle until the next call to analogWrite() (or a call to digitalRead() or digitalWrite()) on the same pin. Simply put, it sets the desired pin to maximum voltage (3.3 V) or 0 volt, in other words, turns it on or off. analogWrite can give output voltage from 0V - 5V ( OUTPUT CAN BE 1V, 1.5V,3V, 3.3V 4.3V, 4.9V, 5V) Hope this helps. Can be used to light a LED at varying brightnesses or drive a motor at various speeds. digitalWrite gives only output voltage of 0V OR 5V. In the case of the analogWrite function and ESP32, it seems to be a mixture of the two. First off its a motor speed controller for a DC motor and I want to be able to switch the rotation of the motor shaft with this circuit I'm building and in doing so I want to be able to stop the motor first before allowing the switching to occur. Writes an analog value ( PWM wave) to a pin. In other cases, the authors of the core library just weren't as dedicated as they might have been to the goal of achieving compatibility with the standardized Arduino API. I'm trying to modify a program that generates PWM.
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