User Manual

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2. Analog ports: 3-wire 4-channel 8-bit ADC sensor port, reference voltage: 3.3V, VCC
voltage: 3.3V.
3. I2C ports: 3.3V I2C bus ports
4. 5V power output: 5V power output to PWM driver.
5. UART port: 4-wire UART port, 5V VCC, perfectly working with SunFounder FTDI Serial to USB.
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.
7. Switch: power switch
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.
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.