I need to connect 24 servo output. any solution?
One of these maybe? Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface [PCA9685] : ID 815 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits. It’s a breakout board that has the same PWM IC as the navio. It connects via I2C. And a serious power source, otherwise you gonna have brownout problems.
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Two Navios? Or something like this:
Ok. I should use the refresh button before posting. 
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