Directory order: (it may be a bit long, so you can skip it)

Picture (I can’t say anything, the picture above!

hardware

1. Introduction(Features)
2. Original parts selection
3. Design Notes

software

1. Introduction
2. Program code description

problems at hand

Demo/Tutorial Video

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picture

hardware

Introduction

This project’s ESP-07-based smart IoT power meter with night light has the following features:

Original parts selection

Design Notes

↑ Current flow and circuit overview

The circuit is divided into 2 parts: strong current and weak current

The strong current part mainly includes: power input, acdc module, current and voltage acquisition circuit, relay and power output socket

The weak current part mainly includes: ESP minimum system circuit, automatic drop circuit, reset circuit, and 5 peripheral circuits

From the picture above, you can see that the entire PCB is clearly divided into two parts, strong and weak (except LED, because it needs to be present in all four corners)

The smallest circuit in the picture is the SHTC3 temperature and humidity sensor circuit. It is really smaller than the LED circuit!

This is the welding diagram of ESP07

This solves the problem of the ESP module occupying a large area, and also solves the problem of signals being blocked by copper coating/tracing.

There are no components near the temperature sensor to reduce measurement errors caused by heat generated by other components.

There is a 0.1uf electric dragon next to each WS2812 to filter and protect the lamp beads.

The power module used is only 2x3x3cm, which is very small and has a 3,3v output. There is no need to install a 5v to 3,3v step-down circuit on the PCB.

The touch circuit uses SD8223LC, which has a self-calibration function and can set different working modes through resistors, and can be connected to a copper-clad small board through pad wiring to extend the operating distance.

Copper-clad small board↓ (5 holes are for convenience of soldering

software

Introduction

The program uses Arduino for programming, and the main libraries used are:

Program Overview

For more details, please see the program comments (my hands hurt typing the comments)

problems at hand

1. Two people are in Hong Kong and the other is in Qingdao, spanning half of China. It is extremely difficult to debug and complete the work.

2. When I printed the board for the first time, I don’t know why the printed board was not filled with copper. I finally prototyped the second board. Fortunately, the course was delayed.

3. The CAD software cannot be opened on the computer to draw the dxf file of the shell. LCEDA can only be used as CAD.

4. The wrong buzzer was selected, and the passive one was selected. Finally, the solution was solved by changing the digitalWrite() → tone() function, and the selected one was only 65db, which has a smaller sound. In addition, the buzzer was connected on the first generation board. For gpio2, I forgot that gpio2 has an onboard LED, so the buzzer will always sound. Although you can stop the buzzer from sounding by pulling the pin high, the function of the LED will be lost. The second generation board will use the buzzer Received gpio13 solution

5. During debugging, the relay always maintained a high level, and there was no response when clicking the switch. Finally, the solution was solved by adding pinMode to the setup function to define the relay pin as an output (I have almost never used pinMode).

6. The SHTC3 temperature and humidity sensor could not read the data, and then I found that I forgot to add the Wire.begin() function.

7. HLW8032 cannot read data. It is initially suspected that it conflicts with the onboard ch340 and cannot read data from the serial port. The tester has not gotten up yet, and the solution is pending (-1 hour left before handing in the homework)

8. WS2812 does not light up. There is no problem with the program. In the end, it was found that it was a welding problem. The first lamp bead was damaged. But at this time, I found that 4 lamp beads were needed, but I only bought 5. The lamp beads on the board It was broken after being dismantled, and only one lamp bead was left............. This story teaches us to buy more spare parts when buying parts.

Fang Fang doesn’t get up, no photos or videos, md