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OpenAlarm

Ultikynnys·OpenAlarm·Kicad/OpenAlarm/OpenAlarm.kicad_pcb

OpenAlarm PCB layout, top view — open source ESP32 board by Ultikynnys
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About the OpenAlarm PCB

OpenAlarm is an open source ESP32 PCB design by Ultikynnys, published on GitHub under the MIT license. It is a 2-layer board measuring 85 × 72.5 mm, with 48 components from 18 distinct parts.

Its main chip is the ESP32-C3-WROOM-02, from the ESP32 family. Other key parts include the MAX98357AETE+T, CH343G and AP7361C-33E-13. By type, the board carries 25 resistors, 12 capacitors, 4 ICs, 3 LEDs and 2 transistors.

It belongs with the audio, iot & wireless and displays & leds designs in this gallery.

From the project

Open source alarm clock

OpenAlarm is a feature-rich, ESP32-based open-source alarm clock, media player, and IoT device with a web-based management interface. Designed for flexibility and reliability, it combines local audio playback, NTP time synchronization, hardware button control, LCD display support, and a modern responsive web UI.

Bachelor's thesis project by Ubeid Hussein — Tampere University of Applied Sciences (TAMK). Thesis available at Theseus.

OpenAlarm, from the project README
From the project README

Main components on the OpenAlarm

ESP32-C3-WROOM-02MAX98357AETE+TCH343GAP7361C-33E-13

OpenAlarm bill of materials (BOM)

48 components, 18 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ESP32-C3-WROOM-02
U1
1
MAX98357AETE+T
U2
1
CH343G
U4
1
AP7361C-33E-13
U5
2
BC847C
Q1, Q3
1
C7529389
TF-CARD H1.8
TF1
1
C2765186
TYPE-C 16PIN 2MD(073)
USB1
3
17-21SUYC/TR8
LED1, LED2, LED3
7
100NF
100nF
C1, C4, C6, C8, C9, C10, C12
4
10UF
10uF
C2, C3, C5, C7
1
100nF
C14
11
10K
R1, R6, R8, R9, R10, R18, R19, R20 +3
3
22
R2, R3, R12
2
5.1KOHM
5.1kOhm
R4, R5
3
4K7
R7, R13, R15
1
1M
R11
4
1K
R14, R17, R24, R25
1
2K2
R16

OpenAlarm design files

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

OpenAlarm: common questions

What microcontroller does the OpenAlarm use?

The OpenAlarm is built around the ESP32-C3-WROOM-02, from the ESP32 family.

How big is the OpenAlarm PCB?

The OpenAlarm measures 85 × 72.5 mm, has 2 copper layers and is 1.69 mm thick.

How many components are on the OpenAlarm?

48 components, from 18 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 OpenAlarm design files?

From the Ultikynnys/OpenAlarm 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 OpenAlarm design in my own project?

Yes, under the terms of its MIT license, which Ultikynnys chose for the repository.

Can I test firmware for the OpenAlarm 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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