# Explorer Hat Pro motor controller two won't go backwards

**URL:** <https://forums.pimoroni.com/t/explorer-hat-pro-motor-controller-two-wont-go-backwards/4943>\
**Category:** Support\
**Created:** [June 2, 2017, 3:59am UTC](https://forums.pimoroni.com/t/explorer-hat-pro-motor-controller-two-wont-go-backwards/4943 "2017-06-02T03:59:23Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![benjvr](https://avatars.discourse-cdn.com/v4/letter/b/e99b99/32.png) [@benjvr](https://forums.pimoroni.com/u/benjvr)\
**Post date:** [June 2, 2017, 3:59am UTC](https://forums.pimoroni.com/t/explorer-hat-pro-motor-controller-two-wont-go-backwards/4943/1 "2017-06-02T03:59:23Z")

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Hi

Putting together STS-PI.

eh.motor.two.backwards(100) does nothing.

Forward works fine.

motor.one works perfect forward and backward.

Have switched motors and cables to isolate problem specifically to motor.two.backwards.

Any idea what to check? I have no soldering in project - just Explorer Hat Pro (brand new) plugged into Pi3 with cables to motors.

Have also noticed that any motor running plugged into motor.two is more noisey (but same speed) compared to when it is plugged into motor.one.

Cheers  
Ben

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**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\
**Post date:** [June 2, 2017, 8:48am UTC](https://forums.pimoroni.com/t/explorer-hat-pro-motor-controller-two-wont-go-backwards/4943/2 "2017-06-02T08:48:30Z")

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Do you have i2s audio enabled? Something like `dtoverlay=hifiberry-dac` in /boot/config.txt? It’s possible something else running on the motor pins could be interfering. BCM 19, 20, 21 and 26 drive the motors.

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**Author:** ![benjvr](https://avatars.discourse-cdn.com/v4/letter/b/e99b99/32.png) [@benjvr](https://forums.pimoroni.com/u/benjvr)\
**Post date:** [June 5, 2017, 11:48pm UTC](https://forums.pimoroni.com/t/explorer-hat-pro-motor-controller-two-wont-go-backwards/4943/3 "2017-06-05T23:48:01Z")

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Hi

Based on possible conflict with i2s audio as indicated in previous post, I reinstalled pi from scratch with nothing but i2c enabled.

Same problem - motor.two.backwards (100) does nothing.

Brand new Explorer Hat Pro faulty?

Cheers  
Ben

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**Author:** ![RogueM](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/roguem/32/311_2.png) [@RogueM](https://forums.pimoroni.com/u/RogueM)\
**Post date:** [June 12, 2017, 11:08am UTC](https://forums.pimoroni.com/t/explorer-hat-pro-motor-controller-two-wont-go-backwards/4943/4 "2017-06-12T11:08:16Z")

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hum, not sure, possibly. Please contact [support@pimoroni.com](mailto:support@pimoroni.com) and they’ll talk you through exchange procedure.

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**Author:** ![pipatrick](https://avatars.discourse-cdn.com/v4/letter/p/8e8cbc/32.png) [@pipatrick](https://forums.pimoroni.com/u/pipatrick)\
**Post date:** [June 1, 2019, 8:11am UTC](https://forums.pimoroni.com/t/explorer-hat-pro-motor-controller-two-wont-go-backwards/4943/5 "2019-06-01T08:11:02Z")

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Hi,  
I recently bought an sts pi setup and am facing the same issue. Has this been resolved yet?