$2 for 10 PCBs prototype: https://jlcpcb.comMake a DIY wifi smartwatch using OLED display for under 20$. The esp8266 module has an inbuilt wifi module which allows the watch to connect to the internet. You can control other electrical appliances remotely through the internet from anywhere in the world. This is possible due to IoT services.
Materials :
ESP12-E(ESP8266) https://amzn.to/2DqS0TP
OLED Display https://amzn.to/2R4iSN0
3.7-volt battery https://amzn.to/2HnI9lr
Buy 10 PCBs at $2 from https://jlcpcb.com
Upload this Gerber file and checkout
https://drive.google.com/open?id=1sabUBZrsGNUEgXb_H7pFd1x25y3xrWuj
PCB Design Credit :
The Technowright
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