User Manual

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5 . UART port: 4-wire UART port, 5V VCC, perfectly working with SunFounder FTDI Serial to USB.

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6 . TB6612 motor control ports: includes 3.3V for the TB6612 chip, 5V for motors, and direction

control of motors MA and MB; working with SunFounder TB6612 Motor driver.

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7 . Switch: power switch

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8 . Power indicators: indicating the voltage – 2 indicators on: >7.9V; 1 indicator on: 7.9V~7.4V;

no indicator on: <7.4V. To protect the batteries, you're recommended to take them out for

charge when there is no indicator on. The power indicators depend on the voltage

measured by the simple comparator circuit; the detected voltage may be lower than

normal depending on loads, so it is just for reference.

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9 . Power port: 5.5/2.1mm standard DC port, input voltage: 8.4~7.4V (limited operating

voltage: 12V~6V).

PCA9865

PCA9685 16-channel 12-bit I2C Bus PWM driver. It supports independent PWM output power

and is easy to use 4-wire I2C port for connection in parallel, distinguished 3-color ports for PWM

output.

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1 . PWM output ports: 3-color ports, independent power PWM output port, connect to the

servo directly.

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2 &

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3 . I2C port: 4-wire I2C port, can be used in parallel. Compatible with 3.3V/5.5V

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4 . PWM power input: 12V max.

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5 . LED: power indicator for the chip and for the PWM power input.