# Estop and IOT relay

**URL:** https://forum.sienci.com/t/estop-and-iot-relay/11855
**Category:** 📛 Others
**Created:** [April 5, 2024, 1:16am UTC](https://forum.sienci.com/t/estop-and-iot-relay/11855 "2024-04-05T01:16:46Z")
**Posts on this page:** 1
**Showing post:** 11

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### Author: ![StephenCampbell](https://forum.sienci.com/user_avatar/forum.sienci.com/stephencampbell/32/6018_2.png) [@StephenCampbell](https://forum.sienci.com/u/StephenCampbell)
#### Post date: [April 5, 2024, 1:04pm UTC](https://forum.sienci.com/t/estop-and-iot-relay/11855/11 "2024-04-05T13:04:44Z")

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Hey @Jstirrat,

I can provide a bit more clarity on the E-stop, but not sure I can help with your actual question.

The **LongBoard** receives power to its ‘brain’ using the USB connection cable. When you hit the E-stop, the power to your motors is cut, but if you flip over the board, you will see a small blue light on the board is still powered. This is the USB cable still providing power to your ‘brain’.

To improve reliability, the new **SuperLongBoard** ’s ‘brain’ now receives its power from the power brick. This means the ON/OFF switch controls the power, which means E-stops on both boards still works to immediately stop the motors in the case of an emergency.

You may be able to create a macro to assist, but I’m not sure it can be tied into an E-stop press.

Cheers,  
Stephen

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