I2C is a very standard bus used in lots of applications. Here's an easy to use I2C driver for a MSP430G2452:
https://github.com/NiHaoMike/OpenDAC...DAC_FW/I2C.cpp
https://github.com/NiHaoMike/OpenDAC...enDAC_FW/I2C.h
If you want something easier, a R/C ESC would work nicely. Those accept a servo type PWM signal and a common 555 can be used for control.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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