# Big ESP32 / SX127x topic part 1

**URL:** <https://www.thethingsnetwork.org/forum/t/big-esp32-sx127x-topic-part-1/10247>\
**Category:** End Devices (Nodes)\
**Created:** [October 24, 2017, 4:39pm UTC](https://www.thethingsnetwork.org/forum/t/big-esp32-sx127x-topic-part-1/10247 "2017-10-24T16:39:55Z")\
**Posts on this page:** 1\
**Showing post:** 347

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**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\
**Post date:** [January 21, 2018, 10:00am UTC](https://www.thethingsnetwork.org/forum/t/big-esp32-sx127x-topic-part-1/10247/347 "2018-01-21T10:00:06Z")

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> [@88bit](#):
>
> I don’t have the Device EUI,
> 
> how can I get this from the Heltec Board?

You can’t; the board does not provide one.

You could generate a semi-random one yourself (possibly based on the onboard WiFi’s MAC address), **see [DevEUI for non-hardware assigned values](https://www.thethingsnetwork.org/forum/t/deveui-for-non-hardware-assigned-values/2093/) for rules to take into account**. Or simply have TTN Console generate one for you by clicking the 🔀 icon at the start of the input field; see [screenshots and a warning](https://www.thethingsnetwork.org/forum/t/deveui-for-non-hardware-assigned-values/2093/40) at the same link.

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