Ask/Aim:
Principle:
Practice:
Linkage:
Exercise/Experiment:

01 radio track

1. Problem/goal

As the core control board of the wireless track smart car model, its power consumption will also affect the power consumption of the entire car model. The core of the control board is the ESP32 microcontroller and the peripheral management circuit. Let's directly measure the power consumption of the circuit in operation.

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2. Basic principles

To measure the power consumption of the ESP32 core control board, that is, the corresponding operating current and operating voltage, use this dedicated operating current measurement module. The core board is not connected to any other peripherals, and there is only one OLED LCD screen on the board, running a program that displays five ADC values. The output voltage can be changed through the current measurement module, and it can be seen that under different output voltages, the current consumption of the core board is basically around 80mA.

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3. Application example

▲ Figure 1.3.1 Core board power consumption

▲ 图1.3.1 核心板功耗

This is the case of using the upper computer software of the power consumption meter to display the power consumption of the core board. The operating voltage of the core board is 8.6V, and the average current is 83.7mA. At this point the power consumption is about 720mW. It is worth noting that the current consumption has a peak period, and this period is 0.5 seconds, which is the same as the period corresponding to running the software to refresh the OLED screen. This means that the OLED consumes more current when being accessed. In order to verify, this is to stop the running of the program, and it can be seen that the current value has no periodic pulse jump, which also verifies the conclusion just now. It shows that at a voltage of about 5V, the average current of the module is 77mA, and the power consumption is about 400mW. In the case of a supply voltage of 9V, the average operating current of the core board is 77mA, and the corresponding power consumption is about 700mW.

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4. Practice/Experiment

This article tests the power consumption of the ESP32 core control board, and it can be seen that it generally consumes about 80mA of current under different voltages. Turning on the OLED will increase the corresponding power consumption. Understanding these power consumptions will provide experimental data for designing energy-saving cars later.

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02 Lecture information

1. Lecture video

2. Lecture information

■ Links to related literature:

● Links to related diagrams:

Figure 1.3.1 Core board power consumption

Wireless track smart car school competition | What is the power consumption based on the ESP32 control board?