# Automation Hat 24v and current

**URL:** <https://forums.pimoroni.com/t/automation-hat-24v-and-current/11831>\
**Category:** Raspberry Pi\
**Created:** [October 6, 2019, 10:41am UTC](https://forums.pimoroni.com/t/automation-hat-24v-and-current/11831 "2019-10-06T10:41:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Pajen](https://avatars.discourse-cdn.com/v4/letter/p/f07891/32.png) [@Pajen](https://forums.pimoroni.com/u/Pajen)\
**Post date:** [October 6, 2019, 10:41am UTC](https://forums.pimoroni.com/t/automation-hat-24v-and-current/11831/1 "2019-10-06T10:41:47Z")

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First of all, I’m not an electrician, which you will guess if you continue reading my question…  
If I got this right I’m going to connect the 24v supply to my “24v external device” and the ground-wire to the Automation Hat “nr 2 ground” and connect a wire from output 2 (sinking output NOT relay) to the ground of my “24v external device”?  
About “nr 2 ground”, at the same time I’m running two “5V internal devices” wired to 5V on the Automation Hat and using “nr 1 ground and nr 3 ground”… Is this right?

Another question is, what happens if my “24v external device” are using more than 500mA, will it burn/over heat or just “limit it self” to not using more than 500mA?

- I’m reading about the Darlinton Array that supplies the outputs can only sink up to 500mA and what it means…

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<div class="post-metadata">

**Author:** ![Pajen](https://avatars.discourse-cdn.com/v4/letter/p/f07891/32.png) [@Pajen](https://forums.pimoroni.com/u/Pajen)\
**Post date:** [October 10, 2019, 3:35pm UTC](https://forums.pimoroni.com/t/automation-hat-24v-and-current/11831/2 "2019-10-10T15:35:30Z")

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In summary, can I connect 5V and 24V to the ground at the same time (is the ground the same for all three connection points)?