Reference
Communication Protocol Description
The shield provides 5 UARTS and 1 I2C interface. Since COM3 and default I2C interface use the same I/O pins, they can’t work simultaneously. You can redefine the I2C pins to avoid this conflict. Refer to Bluno Me reference manual——I2C
API Description
5V-supported Pins
There are 17 5V-supported pins on the shield.
- Digital I/O pins with white background support 5V power input
- Digital I/O pins with black background support 3.3V power input only, be careful!
Indicator LED “L”
An on-board LED is connecting D13 digital I/O pin.
Color-coded 3-Pin Interface
Green: Digital Signal Blue: Analog Signal Red: VCC Black: GND There are two rows pin headers beside the signal pin headers. They are arranged in regular sequence as Signal/VCC/GND, which is compatible with sensor pins order. All Red pins and Black pins are linked respectively. ’’’Note: Since there are a lot of 5V signal analog sensors that have an operating voltage that is higher than Bluno's operating voltage, we have added bleeder circuits on the shield analog section. They can convert the voltage signal from 0~5V to 0~3.3V one and protect micro controller.’’’
3.3V/5V operating voltage switch
The shield includes a voltage hardware setting through a switch to allow compatibility with a bigger range sensors and modules. It can change the color code VCC pins output voltage to 3.3V or 5V.
External Power port
There is an external power port on the shield, which connecting to the M3 on-board external power port. The input voltage could be 7~12V. And when the board is connected to the USB and External power simultaneously, the power resource will change to the external automatically
Servo power port (5~12V)
Servo power port A external power connector for servos, as in other products of this family. If you need to power a large array of servos, use the screw terminals to connect your power supply and just drive it directly from your M3 Servo power port is only connecting to the color-code pin headers, it won’t power the MCU. When you power the board with USB or external power port, and if you connect a power resource (>5V) to the servo power port, color-code VCC pin headers will get power from Servo power port automatically.
Other Supplementary Information
Was this article helpful?