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Sprinkler-System

Swamp-Ig·Sprinkler-System

Sprinkler-System PCB layout, top view — open source ESP32 board by Swamp-Ig

About the Sprinkler-System PCB

Sprinkler-System is an open source ESP32 PCB design by Swamp-Ig, published on GitHub. It is a 2-layer board measuring 165 × 85 mm, with 73 components from 37 distinct parts.

Its main chip is the ESP32-WROOM-32U, from the ESP32 family. Other key parts include the AMS1117-3.3, EL817, HLK-PM01 and ULN2803A. By type, the board carries 20 resistors, 13 capacitors, 12 connectors, 7 relays, 5 ICs and 2 fuses.

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

From the project

PCB design for five zone sprinkler system. For ESPHome with an Esp32 module.

A custom PCB for controlling up to six 24 VAC irrigation solenoid valves via WiFi, using an ESP32 and ESPHome with native Home Assistant integration.

- 6 independent zones — each zone switches a 24 VAC solenoid valve via an Omron G5LE-1 relay - WiFi control — ESP32-WROOM-32U with external U.FL antenna connector - Home Assistant integration — ESPHome firmware; zones appear as switch entities - Onboard power supply — HLK-PM01 AC-DC module (mains → 5 V); AMS1117-3.3 regulator (5 V → 3.3 V for ESP32) - Relay isolation — ULN2803A Darlington array isolates ESP32 GPIOs from relay coil drive current…

Main components on the Sprinkler-System

AMS1117-3.3EL817HLK-PM01ESP32-WROOM-32UULN2803A

Sprinkler-System bill of materials (BOM)

73 components, 37 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AMS1117-3.3
U1
1
EL817
U2
1
HLK-PM01
U3
1
ESP32-WROOM-32U
U4
1
ULN2803A
U5
1
Main_Supply
J1
1
XFMR_Out
J2
1
XFMR_In
J3
1
Conn_Button
J4
1
UART0
J5
1
I2C
J6
1
Station_0
J20
1
Station_1
J21
1
Station_2
J22
1
Station_3
J23
1
Station_4
J24
1
Station_5
J25
1
T1A
F1
1
T2A
F2
1
I2C_VCC
JP1
Show 17 more
QtyPartRefs
1
G3MB-202P
K1
6
G5LE-1-DC5
K20, K21, K22, K23, K24, K25
2
10D471K
RV1, RV2
6
68V
RV20, RV21, RV22, RV23, RV24, RV25
1
EN
SW1
1
BOOT
SW2
1
IO2
LED1
1
PWR
LED2
1
1N4148
D1
2
10u
C1, C7
2
22u
C2, C3
8
100n
C4, C6, C20, C21, C22, C23, C24, C25
1
220u
C5
7
10k
R1, R3, R5, R6, R8, R10, R11
5
4k7
R2, R9, R12, R13, R14
2
470
R4, R7
6
100
R20, R21, R22, R23, R24, R25

Sprinkler-System design files

The KiCad project lives in the Swamp-Ig/Sprinkler-System repository on GitHub; these links point at the commit this page was built from.

Sprinkler-System: common questions

What microcontroller does the Sprinkler-System use?

The Sprinkler-System is built around the ESP32-WROOM-32U, from the ESP32 family.

How big is the Sprinkler-System PCB?

The Sprinkler-System measures 165 × 85 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sprinkler-System?

73 components, from 37 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Sprinkler-System design files?

From the Swamp-Ig/Sprinkler-System repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Sprinkler-System design in my own project?

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

Can I test firmware for the Sprinkler-System 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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