How many ultrasonic sensors HC-SR04 to arduino uno?

Hi everyone!
Can anyone tell me how many ultrasonic sensors HC-SR04 can i connect to an arduino uno?


You can probably multiplex as many as you want.

What are you wanting to do?

Looks like each device would consume two digital pins, so directly, nine if you were to give up serial and use the analog pins. Be aware though that they'll interfere with each other if they're close together and you try to use them at the same time.