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30a water heater controller

flaviut·30a-water-heater-controller

30a water heater controller PCB layout, top view — open source ESP32 board by flaviut

About the 30a water heater controller PCB

30a water heater controller is an open source ESP32 PCB design by flaviut, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 85 × 56 mm, with 42 components from 23 distinct parts.

Its main chip is the ESP-WROOM-02, from the ESP32 family. Other key parts include the TPS54331DR and ADS1115IDGS. By type, the board carries 14 resistors, 13 capacitors, 3 ICs, 3 diodes, 2 relays and 1 transistor.

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

From the project

Makes any resistive water heater 30A or less WiFi controllable

This board contains a design for a water heater controller that is good for up to 30A water heaters.

Working with high currents and mains voltages is dangerous. Death from electrical shock & house fires are both real risks with this project.

This project comes with no warranty, and is not examined by or listed by any NRTL. You are solely responsible for determining if it is safe.

30a water heater controller, from the project README
From the project README

Main components on the 30a water heater controller

ESP-WROOM-02TPS54331DRADS1115IDGS

30a water heater controller bill of materials (BOM)

42 components, 23 distinct parts.

QtyPartRefs
1
ESP-WROOM-02
U1
1
TPS54331DR
U2
1
ADS1115IDGS
U3
1
AO3400A
Q1
1
PROG
J1
1
100k_COLD
100k_COLD
1
100k_HOT
100k_HOT
2
J115F21C12VDCS.9
K1, K2
1
IRM-05-12
PS1
1
SKRKAEE020
SW1
2
SS54
D1, D2
1
SMF05CT1G
D3
1
33u
L1
3
22u
C1, C3, C9
1
8.2n
C2
1
3.3n
C4
7
100n
C5, C7, C8, C10, C11, C12, C13
1
15n
C6
1
1k
R1
7
10k
R2, R3, R8, R9, R12, R13, R14
Show 3 more
QtyPartRefs
1
7.5k
R4
1
2.4k
R5
4
100k
R6, R7, R10, R11

30a water heater controller design files

The KiCad project lives in the flaviut/30a-water-heater-controller repository on GitHub; these links point at the commit this page was built from.

30a water heater controller: common questions

What microcontroller does the 30a water heater controller use?

The 30a water heater controller is built around the ESP-WROOM-02, from the ESP32 family.

How big is the 30a water heater controller PCB?

The 30a water heater controller measures 85 × 56 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 30a water heater controller?

42 components, from 23 distinct parts. The full bill of materials is listed on this page.

Where can I download the 30a water heater controller design files?

From the flaviut/30a-water-heater-controller repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the 30a water heater controller design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which flaviut chose for the repository.

Can I test firmware for the 30a water heater controller 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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