Recently I brought this assembly kit Bluetooth led clock at Banggood: http://www.banggood.com/DIY-AT89S52-Rotation-LED-Electronic-Clock-Kit-51-SCM-Learning-Board-p-965849.html Here are some pictures showing the process: The assembly was relatively easy. Except the SMD leds, resistors, transistors and capacitors! They were a little bit harder to solder. Unfortunately the Bluetooth feature didn’t work with my actual mobile phone, that has Android 4.4 […]