iFlight BLITZ ATF435 Flight Controller Wiring Diagram and Setup Guide

Overview

This document outlines the wiring and configuration for the iFlight BLITZ ATF435 Flight Controller, designed for FPV drones. It covers connections for various digital video transmitters, receivers, ESCs, and other essential components, along with key Betaflight setup parameters.

General Pinout and Board Layout

The iFlight BLITZ ATF435 features a standard layout with accessible connection points. Key pins include:

• Power: VBAT (Battery Voltage), GND (Ground), 5V, 9V, 3V3
• UARTs: TX, RX for communication with peripherals like receivers and VTX.
• Motor Outputs: M1, M2, M3, M4 for ESC connections.
• Current Sensor: CUR
• Peripherals: SDA, SCL for I2C devices (like GPS), LED, BUZ- (Buzzer).
• Other: VI (Video Input), NC (Not Connected), T1, T2, T4, R1, R2, R2i, R4, R5, R6.

Note: SDA/SCL pads cannot be remapped to UARTs.

Digital Video Transmitter Connections

The flight controller supports various DJI digital video systems and other transmitters:

DJI Digital Transmitters

• Caddx Vista: Connects via VBAT, GND, RX, TX, SBUS. Supports 7.4V-26.4V input.
• DJI Air Unit: Connects via VBAT, GND, RX, TX, SBUS. Supports 7.4V-17.6V input. Important: For 6S battery operation, an additional BEC (Voltage Regulator) is required as the DJI Air Unit only handles up to 4S.
• DJI O3 Air Unit: Connects via VBAT, GND, RX, TX, SBUS. Supports 7.4V-26.4V input.

DJI Remote Controller Compatibility

• DJI FPV Remote Controller 2 is for DJI O3 Air Unit.
• DJI FPV Remote Controller is for DJI Air Unit and Vista.

Betaflight Configuration for DJI OSD

To enable the DJI Air Unit OSD under Betaflight 4.4 and later, select VTX (MSP+Displayport) in the peripheral port where the air unit signal is connected.

Protocol Matching

Ensure your DJI Goggle protocol and Betaflight protocol match. For lower signal latency, use the SBUS BAUD FAST protocol option on both ends. To enable this in Betaflight Configurator CLI, enter: set sbus_baud_fast=on, then save.

Receiver Connections

The flight controller supports various receiver protocols:

• TBS nano CRSF / ELRS CRSF: Connect via VBAT, GND, RX, TX using a serial UART port.
• Any other Receiver (e.g., SBUS): Connect via VBAT, GND, RX, TX, SBUS. If not using a DJI remote controller, do not connect SBUS and GND.

Betaflight Configuration: In the Betaflight Configurator's Ports tab, set the UART for the receiver to 'Serial Rx' and select the correct data format (e.g., SBUS, CRSF).

Other Peripheral Connections

• VTX/CAM: Connect VIDEO, GND, 5V, RX.
• LED/BUZZER: Connect LED and BUZ- for status indicators and audio alerts.
• ESC: Connect ESCs to motor outputs (M1-M4) and power/ground pins (BAT, GND). The CUR pin is for current sensing.
• GPS: Connect GPS module to GPS, GND, SDA, SCL pins.

Betaflight Configuration Tabs

The flight controller is configured using the Betaflight Configurator. Key tabs and settings include:

• Ports: Configure serial ports for receivers, VTX, GPS, etc. Set Baud rates and protocols.
• Configuration: Set up Gyro/PID loop frequencies, ESC protocol, receiver mode, system configuration, and arming/disarming settings. For VTX control, options like VTX (MSP+D AUTO), VTX (IRC Tramp), or VTX (TBS SmartAudio) are available. Camera control can be set via Camera (RunCam Protocol).
• Power & Battery: Configure voltage and current monitoring.
• PID Tuning: Adjust PID controllers for flight stability.
• Receiver: Configure receiver settings and channel mapping.
• OSD: Customize the On-Screen Display elements.
• Blackbox: Enable and configure flight data logging.
• GPS: Configure GPS settings such as Auto-detect, Set Home Point Once, Ground Assistance Type, and Use Galileo.

Status Indicator LEDs

The flight controller features status LEDs to indicate operational states:

• Blue LED: Indicates FC startup is successful.
• Red LED: Indicates 3.3V and MCU availability.
• Green LED: Indicates 5V BEC output availability.
• Orange LED: Indicates VBAT (Battery Voltage) availability.

Each LED provides a quick visual status of your flight controller's health.