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Unlike most liquid pumps
all for under $40
But the chip is a pain to solder
which gives access to advanced functionality
but they do work quite well for small data packet transmission when you ned more range than 2
Adafruit Drawdio Kit esp8266 Unlike most liquid pumpsDrawdio is an electronic pencil that lets you make music while you draw! It's great project for beginners: An easy soldering kit with instant gratification. Essentially, its a very simple musical synthesizer that uses the conductive properties of pencil graphite to create different sounds. The result is a fun toy that lets you draw musical instruments on any piece of paper. Runs on a single AAA battery for many hours (even 'nearly dead' batteries will
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