HardLabs

Esp32 Smart Plug

lalithk06·Esp32_Smart_Plug·Hardware/Hardware Design/ZAP-010A.kicad_pcb

Esp32 Smart Plug PCB layout, top view — open source ESP32 board by lalithk06

About the Esp32 Smart Plug PCB

Esp32 Smart Plug is an open source ESP32 PCB design by lalithk06, published on GitHub. It is a 2-layer board measuring 105 × 58 mm, with 70 components from 31 distinct parts.

Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the AMS1117-3.3, USBLC6-2P6 and DS3231M. By type, the board carries 26 resistors, 16 capacitors, 7 diodes, 6 switches, 4 ICs and 3 connectors.

It belongs with the iot & wireless designs in this gallery.

From the project

Hardware reference design for an ESP32-S3 smart plug with mains power conversion, relay switching, RTC support, USB connectivity, and protection components. Built to explore real-world embedded hardware and power electronics design. The design is recreated for educational purposes to understand mains-powered embedded hardware.

This project presents the schematic and PCB design of a smart plug capable of switching AC loads while supporting modern embedded features such as USB connectivity, RTC support, and protection circuitry. Designed to explore real-world embedded hardware development and PCB design practices.

The system uses an ESP32-S3 microcontroller as the core processing unit. AC mains input is stepped down and regulated to provide safe DC power for the controller. A relay switching circuit enables the ESP32 to control connected appliances. Protection components safeguard the device against voltage spikes…

Esp32 Smart Plug, from the project README
From the project README

Main components on the Esp32 Smart Plug

AMS1117-3.3ESP32-S3-WROOM-1USBLC6-2P6DS3231M

Esp32 Smart Plug bill of materials (BOM)

70 components, 31 distinct parts.

QtyPartRefs
1
AMS1117-3.3
U1
1
ESP32-S3-WROOM-1
U2
1
USBLC6-2P6
U3
1
DS3231M
U4
2
AO3400A
Q1, Q2
1
Screw_Terminal_01x04
J1
1
USB_C_Receptacle_USB2.0_16P
J2
1
Conn_01x04_Pin
J3
1
CH291-1220LF
BT1
1
500mA 250V
F1
1
Relay_SPDT
K1
1
MLT-8530
LS1
1
HLK-5M05
PS1
1
10D56K
RV1
5
SW_Push
SW1, SW3, SW4, SW5, SW6
1
SW_Push
SW2
3
RED_LED
D1, D5, D6
1
MBR0520
D2
2
1N4148W
D3, D7
1
RED_LED
D4
Show 11 more
QtyPartRefs
1
0.1uF
C1
1
220uF
C2
3
10uF
C3, C5, C7
10
0.1uF
C4, C6, C8, C9, C10, C11, C12, C13 +2
1
2.2uF
C16
1
1M
R1
1
4k
R2
11
10K
R3, R9, R13, R14, R15, R16, R17, R18 +3
2
5k
R4, R5
6
0R
R6, R7, R19, R20, R23, R24
5
1K
R8, R10, R11, R12, R26

Esp32 Smart Plug design files

The KiCad project lives in the lalithk06/Esp32_Smart_Plug repository on GitHub; these links point at the commit this page was built from.

Esp32 Smart Plug: common questions

What microcontroller does the Esp32 Smart Plug use?

The Esp32 Smart Plug is built around the ESP32-S3-WROOM-1, from the ESP32 family.

How big is the Esp32 Smart Plug PCB?

The Esp32 Smart Plug measures 105 × 58 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Esp32 Smart Plug?

70 components, from 31 distinct parts. The full bill of materials is listed on this page.

Where can I download the Esp32 Smart Plug design files?

From the lalithk06/Esp32_Smart_Plug repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Esp32 Smart Plug design in my own project?

The repository has no license, so all rights stay with lalithk06. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Esp32 Smart Plug without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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