DIY LED lens

[APL2017]

For my battery powered water leak nodes I wanted to add a clear lens to be able to see communication LED status on Arduino Pro Mini while maintaining reasonable water protection. The quick no cost solution was:

1. Drill small hole in node enclosure against LED location
2. Cover it from outside with masking tape
3. Put some amount of hot glue from the inside to cover the hole, wait till glue hardens, remove masking tape. And voila!!