Using a 3.3v PWM signal to control a 5v PWM motor controller

Using Arduino General Electronics
1

I'd like to use a Teensy 3.2 (3.3v) PWM output to provide input to control a 15A 90v motor controller.
With a 5v Arduino I get a great range of speed control, but looking at the motor controller (the original input is just a 100k pot across 0-5v) I think the input is just an R-C circuit to convert PWM to voltage.
I'm thinking a 3.3v PWM signal will only give 3.3v max to that same circuit.
Is there a simple voltage shifter circuit to boost the voltage from 3.3 to 5v? 5v is available from the motor controller.
Motor Controller XY-C-1215

2

this is the circuit I use for my pwm controller

use a 10k trimmer.

The trimmer can adjust the output between 3.3v and 10v.

adding more description for completeness.
The circuit is a non inverting op-amp.
the gain is
3.3v * (1+(R18/R13))

so if R18 timmer is 0 ohms, you get 3.3v output.
at max, if R18 is 10k, your output is 3.3 (1+10/4.7) = 10.32v.

if you want fixed 5v output, use 2.4k for R18.

if you want signal to be analog, add an RC circuit to the output.

3

This should also work except the output would be inverted, am I correct? Only 3 tiny components would be a major plus.

4

I think that will work.

If you want less component, you can setup the pin on the teensy to be open drain and just pullup to 5v.

5

I just found a simple motor controller that should do the trick using 2 PWM signals...

3.6A Brushed DC Motor Driver with Integrated Current Sensing (PWM Ctrl)

45v motor supply, bi-directional, selectable current limiting, logic levels are 3.3v or 5v tolerant. :slight_smile: