nRF52840 small sensor Tag, Low power design, battery operated
https://www.homesmartmesh.com/docs/microcontrollers/nrf52/thread_sensortag/
Free support, feedback and discussions right here on gihub https://github.com/orgs/HomeSmartMesh/discussions
HomeSmartMesh/nrf52_thread_sensortag
nRF52840 small sensor Tag, Low power design, battery operated
RoffMIT