Matek Flight Controller F405-WTE with ELRS/WiFi
by Matek Systems

FLIGHT CONTROLLER F405-WTE

STM32F405RGT6, ICM42688P, SPL06, OSD, ESP WIFI telemetry/ELRS 2.4G receiver, 6xUARTs, 12x PWM,1xI2C

FC Specifications Buy from RMRC

• MCU: STM32F405RGT6, 168MHz , 1MB Flash
• IMU: ICM42688-P
• Baro: SPL06-001
• OSD: AT7456E
• Blackbox: MicroSD card slot
• ESP WiFi Telemetry(MAVLink, 14dBm)
• ExpressLRS 2.4G receiver(CRSF protocol, Telemetry 12dBm)
• 6x UARTs,  1x Softserial_Tx option(INAV)
• 12x PWM outputs
• 1x I2C
• 4x ADC (VBAT, Current, RSSI, Airspeed)
• USB/Beep Extender with Type-C(USB2.0)
• Dual Camera Inputs switch
• 9V(12V) for VTX power switch

FC Firmware 

• ArduPilot: MatekF405-TE
• INAV: MATEKF405TE_SD (not available in INAV configurator 4.x)

PDB Copied from RMRC

• Input voltage range: 6.8~30V (2~6S LiPo)
• 1x ESC power pads
• Battery Voltage divider 1K:20K (Scale 2100 in INAV,  BATT_VOLT_MULT 21.0 in ArduPilot)
• Current Senor: 220A,  3.3V ADC  (Scale 150 in INAV,  66.7 A/V in ArduPilot)
• Sense resistor: 90A continuous, 220A peak

BEC 5V output

• Designed for Flight controller, Receiver, OSD, Camera, Buzzer, 2812 LED_Strip, Buzzer, GPS module, AirSpeed
• Continuous current: 2 Amps, Max.3A

BEC 9V /12V output

• Designed for Video Transmitter, Camera, Gimbal ect.
• Continuous current: 2 Amps, Max.3A
• 12V option with Jumper pad
• for stable 9V/12V output, input voltage should > output voltage +1V

BEC Vx output

• Designed for Servos
• Voltage adjustable, 5V Default, 6V or 7.2V via jumper
• Continuous current: 8 Amps, Max.10A
• for stable Vx output, input voltage should > Vx voltage +1V

BEC 3.3V output

• Designed for Baro / Compass module and external 3.3V peripherals
• Linear Regulator
• Continuous current: 200mA

Physical Attributes

• Mounting: 25 x 25mm, Φ2mm
• Dimensions: 44 x 29 x 12.7mm
• Weight: 22g  w/ USB/buzzer adapter

Includes

• 1x F405-WTE
• 1x USB(Type-C)/Beep (Passive buzzer) Extender + 20cm JST-SH-6P to JST-SH-6P cable for USB extender.
• 2x IPEX-MHF1 2.4G Antennas
• 1x Rubycon ZLH 35V 470uF capacitor
• Dupont 2.54 pins  (Board is shipped unsoldered)

ESP WIFI TLM & ELRS

ArduPilot ESP8266 wifi telemetry

• https://ardupilot.org/copter/docs/common-esp8266-telemetry.html
• Tool:  ESP_NodeMCU-PyFlasher.exe
• Firmware: firmware-esp01_1m.bin
• Flashing with ESP_NodeMCU-PyFlasher
  1. Wire the ESP8285(ETx, ERx) into the USB-TTL adapter, with ETx on F405-WTE connected to the Rx on the USB-TTL, and ERx connected to the Tx of the USB-TTL. Wire 4v5 and GND of F405-WTE to 5V and GND of the USB-TTL
  2. Connect USB-TTL Adapter to PC while pressing and holding the ESP8285 boot button in.
  3. open ESP_NodeMCU-PyFlasher
  4. select Serial port of USB-TTL module,  load firmware,  select “Dual Output(DOUT)”  and “Yes.wipes all data“
  5. click “Flash NodeMCU“
  6. after flashing, Power off , then power on F405-WTE by USB or Battery.
  7. Wait a few seconds,  search WiFi SSID  “ArduPilot”, and password is “ardupilot”
  8. Tips: Red LED for ELRS receiver will not turn on if MAVESP8266 firmware is flashed in.

ExpressLRS 2.4G Receiver

• https://www.expresslrs.org/2.0/quick-start/getting-started/
• ExpressLRS AUX1-AUX8 are not full resolution CH.  https://www.expresslrs.org/2.0/software/switch-config/
• Flashing via WiFi
  1. Power on F405-WTE by USB, Receiver’s LED(Red) will blink slow at first, and after 30s, it should blink fast indicating it’s on WiFi Hotspot Mode.
  2. More detailed steps,  pls refer this page.
  3. Target: DIY 2.4GHz / DIY_2400_RX_ESP8285_SX1280
• Flashing via UART
  1. Wire the ESP8285(ETx, ERx) into the USB-TTL adapter, with ETx on F405-WTE connected to the Rx on the USB-TTL, and ERx connected to the Tx of the USB-TTL. Wire 4v5 and GND of F405-WTE to 5V and GND of the USB-TTL.
  2. Connect USB-TTL Adapter to PC while pressing and holding the ESP8285 boot button in.
  3. Select the target DIY 2.4GHz / DIY_2400_RX_ESP8285_SX1280 and  “UART” for Flashing Method,  set your bind phrase and Firmware Options and once done, click on Build and Flash.

UDP Connection with INAV configurator over WiFi

• https://github.com/iNavFlight/inav-configurator/pull/1498
• https://github.com/Scavanger/MSPWifiBridge
• Tool:  ESP_NodeMCU-PyFlasher.exe
• Firmware: MSPWifiBridge_ESP-01.bin  compiled based on github.com/Scavanger/MSPWifiBridge
• Flashing with ESP_NodeMCU-PyFlasher
  1. Wire the ESP8285(ETx, ERx) into the USB-TTL adapter, with ETx on F405-WTE connected to the Rx on the USB-TTL, and ERx connected to the Tx of the USB-TTL. Wire 4v5 and GND of F405-WTE to 5V and GND of the USB-TTL
  2. Connect USB-TTL Adapter to PC while pressing and holding the ESP8285 boot button in.
  3. open ESP_NodeMCU-PyFlasher
  4. select Serial port of USB-TTL module,  load firmware,  select “Dual Output(DOUT)”  and “Yes.wipes all data“
  5. click “Flash NodeMCU“
  6. after flashing, Power off , then power on F405-WTE by USB or Battery.
  7. Wait a few seconds,  search WiFi SSID  “MSPWifiBridge”, and password is “123456789”
  8. If there is no automatic forwarding to the configuration page, go to http://192.168.4.1 manually. Standard login data: Username: admin, Password: 123456789

Inav Mapping

Ardupilot Mapping

• set LOG_BACKEND_TYPE = 1 (File) for SD card logging
• If sending highspeed serial data (eg. 921600 baud) to the board, use USART1(Serial1) or USART2(Serial6).

Frsky Smartport Telemetry

• non-inverted (hacked) S.Port signal

• any spare Uart_TX
• SERIALx_BAUD   57
• SERIALx_OPTIONS  7
• SERIALx_PROTOCOL  4  or 10(for yaapu)

DJI FPV OSD (ArduPilot 4.1)

https://ardupilot.org/plane/docs/common-msp-osd-overview.html

• OSD_TYPE = 3
• SERIALx_PROTOCOL = 33
• MSP_OPTIONS = 0 (polling mode)

Relay(PINIO)

• PINIO1,  9Vsw power switch, On by default
• PINIO2,  Camera switch, C1 ON by default

# GPIOs

• PA4  PINIO1  OUTPUT  GPIO(81)  LOW  //9Vsw pad power switch
• PB5  PINIO2  OUTPUT  GPIO(82)  LOW  //camera switch

# RCx_OPTION: RC input option

• 28   Relay On/Off
• 34   Relay2 On/Off
• 35   Relay3 On/Off
• 36   Relay4 On/Off

e.g.

• RELAY_PIN       81    //9Vsw GPIO
• RC7_OPTION   28    //Relay On/Off, Use CH7 of Transmitter to control 10V ON/OFF
• RELAY_PIN2     82    //Camera switch GPIO
• RC8_OPTION   34    //Relay2 On/Off, Use CH8 of Transmitter to control high/low level on PB5 pad

The configured feature will be triggered when the auxiliary switch’s pwm value becomes higher than 1800. It will be deactivated when the value falls below 1200.

Check the pwm value sent from the transmitter when the switch is high and low using the Mission Planner’s Initial Setup >> Mandatory Hardware >> Radio Calibration screen. If it does not climb higher than 1800 or lower than 1200, it is best to adjust the servo end points in the transmitter.

Tips

• F405-WTE has INAV fw preloaded for QC
• Download INAV firmware 4.1.x from our website. Target MATEKF405TE_SD is not listed in INAV configurator 4.x.x,  It is supported by INAV5.0 or newer
• ESP8285 has ExpressLRS fw 2.x preloaded with binding phrase “123456”,  the Receiver will never enter binding mode if using the traditional binding procedure. It must be flashed without a binding phrase to do traditional binding OR flashed with your binding phrase.

• ArduPilot fw, set LOG_BACKEND_TYPE = 1 (File) for SD card logging