4G remote control car, unlimited distance control

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Background: The traditional remote control is a 2.4G remote control represented by a model airplane, and the remote control distance is very long when there is no obstacle outside, up to several kilometers, but when there are obstacles, the remote control distance may only be more than 10 meters. There are also some 2.4G remote control modifications to 4G on the market, which is to read the 2.4G remote control signal and forward it to the server, but the price is expensive, hundreds to thousands of dollars! And there is no open-source all-in-one 4G remote control either.

This remote control designed this time is a 4G remote control, as long as there is a 4G network, it can be perfectly controlled, with a delay of about 100ms. Once you have it, you'll be able to drive your car out on adventures, grocery shopping, and delivery pickups from home......

PCB Principle Explained: https://b23.tv/M0YOuhc

Wiring and Programming Explanation: https://b23.tv/CGYeeiF

Feature Demo Tutorial: https://b23.tv/MHm4PhB

(There is a text version of the explanation later)             

Remote Control:ESP32 reads the voltage of the joystick and knob through the ADC, converts it into data that can be recognized by the ESC and servo, and transmits the data through Now and MQTT modes.

I think that the circuit is very simple, the important thing is the program, docking the network MQTT server, and data transmission.

Receiver: To put it simply, it is an Esp8266 minimum system board, adding several power supplies and grounding headers, which is convenient for us to insert the three wires of the servo and ESC.

ESC: After the power supply is connected, the 5V voltage is obtained through the LM1085S buck chip, and the output is through the pin header and USB port, which is convenient for us to supply power to the webcam and portable WIFI.

The other way is connected to the RZ7889 motor driver chip, which reads the rudder quantity STC15W104 the single-chip microcomputer and drives the motor through RZ7889. (See < Performance Indicator > in the figure)

Working Principle Flow Diagram

Now mode: The communication mode that comes with ESP microcontrollers, which can communicate directly in close distance.

MQTT mode: The remote control transmits the data to the network server, and the receiver reads the server data, which can communicate over unlimited distances.

Performance Metrics

Trolley Frame

If the frame is marked (aluminum substrate), you can choose the "aluminum substrate" material when placing an order, which is more robust. (Recommended)

The rest are not marked with "FR-4" material.

This is the first version of the car, the structural strength is not large, the outside community is OK, if you want to buy groceries, pick up the express, you have to change to a larger car, such as RC climbing car, the ESC and the servo line can be connected according to the wiring diagram!

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Later, I bought a Mangniu MN99S car and modified it like this. See diagram below.

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2023.03.22：

(1) The mac address in the esp32 remote control program is required, fill in the mac address of the receiver (the receiver burns the getMac program to obtain the mac address, you need to fill in the esp32 program format)

(2) The boost module behind the ESP32 remote control needs to be adjusted to 5V, see the boost module product details for the method.