DIY AT89S52 Rotation LED Electronic Bluetooth Protocol 2.0 Control Clock Kit 51 SCM Learning Board
Please click this topic http:forum.banggood.comforum-topic-451.html , it have the English software.
This is the soldering guide https:copy.comsHkefyBZJyG2Qq1
Feature:
SCM: AT89S52
Power supply voltage, miniUSB, an external 5 v voltage 3 v button battery for clock chip on the board of the standby power supply