#Arduino mega 2560 servo pin generator#
#Arduino mega 2560 servo pin driver#
#Arduino mega 2560 servo pin software#

Although h-bridges might sound overkill for your actual needs, they could still be simpler than doing it in any other way. If the torque experienced on any motor changes at some point then the speed will change too, unless you can monitor that speed with an encoder and adjust the PWM accordingly. Why do you need 20 motors to run together like this? And if getting the same speed from all of them is important, part of your description hinted at this, then you will really need encoders for closed loop feedback to ensure they are all running together rather than simply assuming that by giving each motor a different but fixed PWM value you can keep them in sync.

#Arduino mega 2560 servo pin driver#

elefurtronik, for a brushed DC motor why do you need more than 1 channel of PWM? Unless you are running twenty separate motors, or giving PWM to 20 separate PWM controlled servo motors which just hapen to have brushed DC motors within them? A h-bridge driver (which lets you easily reverse and do coasting versus sudden braking) chip might be more to your liking than a MOSFET here too, h-bridge chips are designed with logic level inputs in mind, no need to worry about exact gate voltages. This becomes even worse if you are taking a pin high and low using PORTx register single clock cycle operation commands which don't have the same logic around them as digitalWrite() does (these methods can be really useful where an arduino compatible microcontroller's putput needs to change rather fast though, digitalWrite() is pretty slow). In my experience, calling digitalwrite() on the same pin as you are PWMing may sometimes have unexpected effects.

#Arduino mega 2560 servo pin generator#

The alterantive for having many PWm channels would be to buy an I'c or SPi controllable PWM generator chip, or buy a microcontroller which you would program to be an I2C/SPI slave and perform this same role. You could set up an interrupt service routine to run triggered by a timer, and whenever it runs it manually turns specific pins on or off as required by your PWm needs.

#Arduino mega 2560 servo pin software#

Quote from: Infraviolet on January 20, 2023, 02:47:08 am IF you can cope with having your software which runs on the arduino spend a lot of its clock cycles on manually toggling pins then you can bitbang out PWM on any pin you want, how much of a strain it will put on doing the other things your program tries to do depends on how fast a frequency you want to apply the PWM to.

I have plenty of room for both the Uno and Mega.IF you can cope with having your software which runs on the arduino spend a lot of its clock cycles on manually toggling pins then you can bitbang out PWM on any pin you want, how much of a strain it will put on doing the other things your program tries to do depends on how fast a frequency you want to apply the PWM to. I'm running a 16x2 LCD for display on that project, and I had a thought that maybe I could send info from the MEGA to the UNO that will run the LCD. I have an Arduino mega, and it's got plenty of pins - but I'm getting a little concerned about the power draw that I'm going to be using for a project (I've posted about it a couple time here and here, but trying to keep separate issues.