# The basic openlog device

**URL:** <https://community.sparkfun.com/t/the-basic-openlog-device/59956>\
**Category:** Other\
**Created:** [August 15, 2024, 7:16pm UTC](https://community.sparkfun.com/t/the-basic-openlog-device/59956 "2024-08-15T19:16:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![doctorwho8](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/doctorwho8/32/3604_2.png) [@doctorwho8](https://community.sparkfun.com/u/doctorwho8)\
**Post date:** [August 15, 2024, 7:16pm UTC](https://community.sparkfun.com/t/the-basic-openlog-device/59956/1 "2024-08-15T19:16:56Z")

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Hello!  
I have here several OpenLog devices, and a now two year old thread confirms that they would work with any 3.3v Arduino devices. But I normally work at 5v levels as with original TTL logic. Suggestions please for enabling these devices to work there.

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**Author:** ![jremington](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/jremington/32/6595_2.png) [@jremington](https://community.sparkfun.com/u/jremington)\
**Post date:** [August 15, 2024, 8:02pm UTC](https://community.sparkfun.com/t/the-basic-openlog-device/59956/2 "2024-08-15T20:02:19Z")

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You need to match the 5V and 3.3V logic levels on TX and RX. This bidirectional logic level shifter is ideal: [https://www.sparkfun.com/products/12009](https://www.sparkfun.com/products/12009)