CLICK HERE: To download the latest ESP32 WiFi Firmware and updater utility. 20 Sept 2019.
If your Dragon Link transmitter was made JULY 2019 or later, and has the BLACK PCB part as shown in the picture to the left, you transmitter has the ESP32 WiFi Module already built in. This gives you amazing capabilities to transmit telemetry information to any computer, tablet, or phone and display it on programs such as Misson Planner, QGroundControl, and more.
The latest version of the DragonLink TX firmware includes a menu-option (from version 3.3 sub
version 10), that will allow the USB-connection to be used for updating firmware on ESP32.
To update firmware
– Hold down the menu-button while powering the module
– Enter menu-option 6
– Plug in the USB-connection
The ESP32 module will now be in bootloader-mode, allowing the firmware to be updated through
Arduino or the ESP32 flash-tool. Note, that the baudrate for upload should be 115200. When in ESP32
update mode, the menu button on the DragonLink TX will reset the ESP32. It should however be
noted, that the module will always start up in bootloader-mode, until the transmitter has been powercycled.
The basic connections on the ESP32 is as seen below:
Data for serial passthrough on the radio-modem:
UART Baudrate: 115200
ESP32 TX-pin: GPIO17
ESP32 RX-pin: GPIO16
The 2 leds underneath the ESP32 module:
BT led (blue led): GPIO18
Wi-Fi LED (green led): GPIO19
Also, the below pins are connected to the MCU, but currenlty only used for firmware-update: