Nano PWM C++

Autonomous Machines Jetson & Embedded Systems Jetson Nano
23

No worries!

24

It took much longer than anticipated, but I finally got to test this, and I can confirm that it works indeed!

I used a MPC6041 and configured it as unity gain amp as follows:

  • VSS to GND (GPIO20)
  • VDD to 3.3V (GPIO17)
  • VIN+ to PWM0 (GPIO32)
  • VOUT to VIN- (on MPC6041)
  • VOUT to PWM Signal

No resistors were required.

Thank you for the help with this @Josh1745!

1 Like
25

And here a little helper script that simplifies setting the PWM value in percentage:

set-pwm.sh 

PERCENTAGE=${1:-100}
PERIOD=${2:-5000000}
CYCLE=$(($PERCENTAGE * $PERIOD / 100))
cd /sys/class/pwm/pwmchip0
if [ ! -d "pwm0" ]
then
  echo 0 > export
fi
cd pwm0
echo $PERIOD > period
echo $CYCLE > duty_cycle
echo 1 > enable

It can be used as follows:

./set-pwm.sh 0
./set-pwm.sh 50
./set-pwm.sh 100
1 Like
26

Glad to hear it, and nice script to test!

1 Like