# Multiple ultrasonic sensor connection to Robot-hat

**URL:** <https://forum.sunfounder.com/t/multiple-ultrasonic-sensor-connection-to-robot-hat/1090>\
**Category:** Robotic kit for Raspberry Pi\
**Created:** [May 10, 2024, 4:58am UTC](https://forum.sunfounder.com/t/multiple-ultrasonic-sensor-connection-to-robot-hat/1090 "2024-05-10T04:58:15Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Purushotthama](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Purushotthama](https://forum.sunfounder.com/u/Purushotthama)\
**Post date:** [May 10, 2024, 4:58am UTC](https://forum.sunfounder.com/t/multiple-ultrasonic-sensor-connection-to-robot-hat/1090/1 "2024-05-10T04:58:15Z")

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Hello ,

I am using a PiCar-X with a Raspberry Pi 4 B Model.  
I need to connect 4 ultrasonic sensors (HC-SR04) to the Robot-hat, which only has 4 available digital pins, allowing me to connect only 2 ultrasonic sensors.

For other 2 Ultrasonic sensor, Which other pins can be used ?

I am planning to connect the 4 trigger pins of the HC-SR04 sensors to the available digital pins D0, D1, D2, and D3 of Robot-hat. Additionally, I will connect the 4 echo pins to available PWM pins.

Is this connection okay?

Thank you !

Best Regards,  
Purusshotthama

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**Author:** ![SunFounder\_Moderator](https://avatars.discourse-cdn.com/v4/letter/s/34f0e0/32.png) [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)\
**Post date:** [May 10, 2024, 9:16am UTC](https://forum.sunfounder.com/t/multiple-ultrasonic-sensor-connection-to-robot-hat/1090/2 "2024-05-10T09:16:41Z")

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Unfortunately, our Robot Hat can only accommodate a maximum of two ultrasonic modules. There are no additional pins available to connect multiple ultrasonic modules.  
Connecting four echo pins to available PWM pins is not feasible in this case.

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<div class="post-metadata">

**Author:** ![Purushotthama](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Purushotthama](https://forum.sunfounder.com/u/Purushotthama)\
**Post date:** [May 10, 2024, 9:39am UTC](https://forum.sunfounder.com/t/multiple-ultrasonic-sensor-connection-to-robot-hat/1090/3 "2024-05-10T09:39:07Z")

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what about connecting 4 trigger pins to PWM and Echo pins to Digital pins ?  
any other possibility ?

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<div class="post-metadata">

**Author:** ![SunFounder\_Moderator](https://avatars.discourse-cdn.com/v4/letter/s/34f0e0/32.png) [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)\
**Post date:** [May 14, 2024, 7:55am UTC](https://forum.sunfounder.com/t/multiple-ultrasonic-sensor-connection-to-robot-hat/1090/4 "2024-05-14T07:55:54Z")

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Sorry it can’t.If you have any further questions, please let me know.

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<div class="post-metadata">

**Author:** ![Purushotthama](https://avatars.discourse-cdn.com/v4/letter/p/c57346/32.png) [@Purushotthama](https://forum.sunfounder.com/u/Purushotthama)\
**Post date:** [May 15, 2024, 9:53am UTC](https://forum.sunfounder.com/t/multiple-ultrasonic-sensor-connection-to-robot-hat/1090/5 "2024-05-15T09:53:50Z")

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Are the Digital D6, D7, D8, and D9 pins configured on the board?

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<div class="post-metadata">

**Author:** ![SunFounder\_Moderator](https://avatars.discourse-cdn.com/v4/letter/s/34f0e0/32.png) [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)\
**Post date:** [May 16, 2024, 8:36am UTC](https://forum.sunfounder.com/t/multiple-ultrasonic-sensor-connection-to-robot-hat/1090/6 "2024-05-16T08:36:17Z")

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The robot hat is only configured with 4 sets of 3-pin digital pins (D0-D3).