I visited China recently on official purpose and I got one day (Sunday) to explore local electronics/computer market. There is an area called Huaqiangbei where multiple tall rise building are there selling all sorts of electronic items. Details of few things which I bought over there are given below. I am yet to try these. Will share my experience later (working or not working!!)
1. Bluetooth UART module - Cost - RMB 35
2. Ultrasonic Ranging Module HC-SR04 - Cost - RMB 10
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