PCB ICONIC DESCRIPTIONS

The following icons are used on the PCB to indicate direction, wiring or the type of signal on a pin.

These icons make wiring in the field simple even without a manual. Learn these symbols and you will be able to wire a Quadrino in the field and get it right every time.

Status Light Indications

RX/TX

These two red/green LEDs next to the USB connector indicate the serial RX/TX status. This is simply receive and transmit activity over the usb wire and is most active during firmware upgrades or MultiWii GUI communication.

STATUS

This yellow LED marked STATUS will blink 3 times on startup, then a bunch of blinks during initialization. Once the initialization is done, the indication will be:

1. OFF indicates the motors are disarmed
2. Solid ON indicates the motors are armed and throttling up will start the props.
3. 3. Blinking – When you move the copter around the status light will respond by blinking. If the blinking is regular and steady and occurs without moving the board this can indicate a problem reading the sensors, either they are misconfigured in the firmware config or the accelerometer (ACC) requires calibration.

STABLE

The blue STABLE LED generally indicates when the Auto-Level feature is enabled but in MultiWii 2.2 this LED is taking on more indication roles due to the STATUS LED being overused.

GREEN

GREEN power light is always on so long as the power is applied to the board.

PCB Board Icons

Icon	Name	Description
	Power	5V Power
	Ground	Power ground plane. The indicated pin or PCB pad goes to the PCB ground plane.
	Signal	Used in the motor, servo and receiver headers to indicate the pin that carries the PWM signal.
	Motor Diagram	This diagram indicates the placement and naming of the motors relative to the Quadrino board. In Quad+ mode, the front of the Quadrino points directly to motor A. In Quad-X mode, the front of the Quadrino points between motor A and C.
	Radius Dimension	This specified a radius dimension. In this case, the distance from any mounting hole to the center of the board.
	Coordinate System	This icon indicates the coordinate system the Quadrino uses. All the sensors are positioned to match this coordinate system. This is also the default coordinate system for the MultiWii firmware.
	Front	This icon indicates the direction of the front of the craft.
	VBATT Input / Battery Monitoring	For use only with battery monitoring, you can plug your main battery directly into this pin. MultiWii will monitor the battery voltage and generate a warning when the battery voltage becomes low.
	Signal Direction	In the case of serial protocols, the problem with using just TX/RX is a case of ambiguous perspective. Does the TX line mean coming out of the device, or the TX line coming from the computer into the device?  The arrow lines indicate the direction of the signal from the perspective of the Quadrino. Towards the pin meaning an input and away from the pin meaning an output. So in this case RX means data coming into the Quadrino and TX means data going out of the Quadrino.

USE THE MULTWII CONFIG PROGRAM

Before we continue, I want to tell you that you should get familiar with the MultiWii config program before wiring up the Quadrino. This ensures that the unit is in good working order before you begin the wiring. Review our tutorial on Configuring the Quadrino. 

You may also want to review the main web site for the MultiWii community that is found at http://www.multiwii.com/. The original source code and config program is found on the google code site. I have also placed the MultiWiiConf program here, and the source code specifically prepared for the Quadrino.

Layout of the Printed Circuit Board

The Quadrino (Zoom) combines the Arduino hardware circuitry with a 10-DOF IMU (Inertial Measurement Unit). This provides a Ready-To-Fly flight controller rather than sourcing your own Arduino Nano, Wii controllers and breakout board yourself. Here is a diagram showing the different function of each chip on the Quadrino.