Parts you'll need:
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A USB To RS232 adapter to program the ESP8266.
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A ESP8266 Model-03 board. This will be the base for the rest of the parts.
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A 2N222A Transistor to drive the motor. The link is for a pack of 20 but you can find these at most electronic parts stores.
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1 or 2 3 volt vibrating motor depending on vibration strength and personal taste.
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A 3.7v LiPo battery and LiPo battery charger. Along with some battery cables to attach to the board and supply the power.
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Breadboard or perfboard to flash the software.
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Some wire (maybe 22AWG) and a soldering iron + solder to join at all together.
Total of all parts should be around $15 AUD or just over $11 USD, not bad for a quick mod.
Next we set up the Ardino IDE.