Use it in combination with this sound and light controller:

https://www.pcbway.com/project/shareproject/Arduino_RC_engine_sound_light_controller_for_ESP32_a9334731.html

This ESC is compatible as well:

https://www.pcbway.com/project/shareproject/RZ7886_based_ESC_for_ESP32_Sound_and_Light_Controller_f8f4a805.html

Very important:

• Please read the comments on the schematic carefully! You can find it here
• The input supply range is 5 - 6V (5 is recommended). If you are using a PAM8403 amplifier: 5V only!
• There is no reverse polarity protection! Check wiring carefully before connecting the battery!

See it in operation:

Link

Discussion forum in German and English:

Link

Main features:

• Connects wirelessly to the sound and light controller in the truck via ESP-NOW (up to 3 trailers)
• Browser based configuration (192.168.4.1), Standard SSID & PW: "My_Trailer", "123456789"
• taillights
• reversing lights
• side lights
• indicators
• motorized legs
• motorized ramps
• rotating beacon

Parts list:

• C1: 1 x 6.3V, 47uF 1206 ceramic capacitor
• C2: 1 x 25V, 22uF 1206 ceramic capacitor
• R1 - R3: 10k, 1/4W
• R4: 1k, 1/4W
• U1: D1 Mini ESP32 Module (read notes on schematic)
• IC1: ULN2003AN (DIL16 thru hole version)
• 0.1" straight 1 row male pin headers
• 0.1" angle 2 row male pin headers
• 0.1" angle 3 row male pin headers
• STL data for top housing
• STL data for 1.6mm bottom housing
• STL data for 1.0mm bottom housing

Assembling:

1. solder capacitors, if you want to use them
2. solder ULN2003
3. solder straight headers, using the D1 Mini as a jig
4. solder angle headers
5. solder resistors, if you want to use them
6. carefully check for solder bridges
7. clean the solder joints, using some flux remover
8. solder battery monitor wire
9. print housing in PETG and snap it in position
10. Assemble battery monitor DuPont header
11. Press both halves together
12. load the software, using VS Code (recommended), the ESP32 Web Flasher or Arduino IDE
13. Wire up your vehicle and have fun!

If you want to change the D1 Mini on board 3.3V regulator according to the schematic:

1. apply flux
2. apply solder to the soldering iron
3. heat the regulator on the side with 3 legs until it comes loose
4. wipe it away, using the soldering iron tip
5. apply flux and then fresh solder to the pads
6. place the new regulator, using tweezers
7. reflow the solder, using the soldering iron on all pins
8. check for solder bridges
9. clean the solder joints, using some flux remover

Example wiring, if used as sound and light controller:

As you can see, this trailer controller can also be used as a sound and light controller, if you are using an external amplifier for the sound! How cool is this?

Configuration website example:

Another application example (with 2nd sound controller board in the trailer):