# Pairing detects same Arduino device more than ones

**URL:** <https://community.homey.app/t/pairing-detects-same-arduino-device-more-than-ones/36899>\
**Category:** Apps\
**Created:** [November 3, 2020, 4:14pm UTC](https://community.homey.app/t/pairing-detects-same-arduino-device-more-than-ones/36899 "2020-11-03T16:14:45Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Jan\_Pathuis](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jan_pathuis/32/15546_2.png) [@Jan\_Pathuis](https://community.homey.app/u/Jan_Pathuis)\
**Post date:** [November 3, 2020, 4:14pm UTC](https://community.homey.app/t/pairing-detects-same-arduino-device-more-than-ones/36899/1 "2020-11-03T16:14:45Z")

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Hi,  
I am using Sonoff S20 sockets with modified Arduino based fw. Recently I changed the firmware and also changed the name of each unit (Homey.begin(deviceName)). As I added a Capability I had to redo the pairing. First I removed the old devices, then I started the pairing. To my surprise all old device names (that were not available by that name on the network anymore, nor used in a Homey.begin()) were added to the pairing list again.  
Then, in the pairing list I only selected one correct new device. But still all the others (those with the same IP-addresses) were added too. If I remove the old devices again, they are added again next pairing.

How do I get rid off the old pairing instances? Thanks again for your help.

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**Author:** ![robertklep](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/robertklep/32/160628_2.png) [@robertklep](https://community.homey.app/u/robertklep)\
**Post date:** [November 3, 2020, 6:01pm UTC](https://community.homey.app/t/pairing-detects-same-arduino-device-more-than-ones/36899/2 "2020-11-03T18:01:53Z")

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Try uninstalling the Homeyduino app (and then install it again), perhaps it keeps some sort of cache.

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**Author:** ![Jan\_Pathuis](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jan_pathuis/32/15546_2.png) [@Jan\_Pathuis](https://community.homey.app/u/Jan_Pathuis)\
**Post date:** [November 3, 2020, 8:29pm UTC](https://community.homey.app/t/pairing-detects-same-arduino-device-more-than-ones/36899/3 "2020-11-03T20:29:30Z")

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Thanks Robert. I tried “Restart app” and that was already sufficient.