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/cmd_vel and arduino diff control

I have arduino mega and vnh5019 driver. I know these libraries :

https://github.com/hbrobotics/ros_arduino_diff_drive https://github.com/hbrobotics/ros_arduino_bridge

But this libraries control motors with PID algorithm (in arduino code). However, my motors havent got encoders so ı dont use PID. I need to control my motors without PID. so ı cannot use this libraries. How can ı use this libraries just control with /cmd_vel.

/cmd_vel and arduino diff control

I have arduino mega and vnh5019 driver. I know these libraries :

https://github.com/hbrobotics/ros_arduino_diff_drive https://github.com/hbrobotics/ros_arduino_bridge

But this libraries control motors with PID algorithm (in arduino code). However, my motors havent got encoders so ı dont use cant drive correct with PID. I need to control my motors without PID. so ı cannot use this libraries. How can ı use this libraries just control with /cmd_vel./cmd_vel. or how can I close PID algorithm ??