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Dual button doorbell

espena·dual-button-doorbell

Dual button doorbell PCB layout, top view — open source ESP32 board by espena
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About the Dual button doorbell PCB

Dual button doorbell is an open source ESP32 PCB design by espena, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 68.6 × 68.6 mm, with 79 components from 38 distinct parts.

Its main chip is the ESP32-WROVER-B, from the ESP32 family. Other key parts include the NCP1117-5v, MAX98357A, NCP1117-3v3, DS3231M and MAX3232. By type, the board carries 26 resistors, 22 capacitors, 12 diodes, 7 ICs, 6 connectors and 2 switches.

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

From the project

ESP32 driven, WiFi-enabled dual-button doorbell with custom audio signals and real-time red/green indicators.

A door bell that simply does more. Configurable with alarms, different sounds for the two buttons, bedtime LED indicator and timed notifications on specific days / hours. With audible 4Ω loudspeaker driven by a class D 3.2 W amplifier.

The project is described on my home page.

- Two-button interface with led indicators - Personalized doorbell sound from custom wav files - Cron calendar for scheduling sounds down to one second resolution - SD card support for storing audio files and configuration - WiFi interface with integrated antenna - MQTT support for smart home integration and push…

Main components on the Dual button doorbell

NCP1117-5vMAX98357ANCP1117-3v3DS3231MMAX3232ESP32-WROVER-B74LVC2G14

Dual button doorbell bill of materials (BOM)

79 components, 38 distinct parts.

QtyPartRefs
1
NCP1117-5v
U1
1
MAX98357A
U2
1
NCP1117-3v3
U3
1
DS3231M
U4
1
MAX3232
U5
1
ESP32-WROVER-B
U6
1
74LVC2G14
U7
1
BC847
Q1
1
Power
J1
1
Speaker
J2
1
SWITCH1
J3
1
UART
J4
1
MicroSD
J5
1
Door panel
J6
1
CR2032
BT1
1
250mA
F1
1
HJR 1-2C
K1
1
Reset
SW1
1
Boot
SW2
1
HDS20M
D1
Show 18 more
QtyPartRefs
1
MRA4007T3G
D2
1
TVSP
D3
7
TVS
D4, D5, D6, D9, D10, D11, D12
1
RED
D7
1
GREEN
D8
10
100nF
C1, C4, C5, C6, C8, C9, C11, C16 +2
2
220µF
C2, C7
4
C_Decoupling
C3, C13, C14, C18
1
22µF
C10
4
1µF
C12, C15, C19, C20
1
4,7µF
C22
2
1k
R1, R2
12
10k
R3, R4, R9, R10, R13, R18, R19, R20 +4
2
4k7
R5, R6
2
2,4k
R7, R8
2
100Ω
R11, R12
4
0Ω
R14, R15, R16, R17
2
100k
R25, R26

Dual button doorbell design files

The KiCad project lives in the espena/dual-button-doorbell repository on GitHub; these links point at the commit this page was built from.

Dual button doorbell: common questions

What microcontroller does the Dual button doorbell use?

The Dual button doorbell is built around the ESP32-WROVER-B, from the ESP32 family.

How big is the Dual button doorbell PCB?

The Dual button doorbell measures 68.6 × 68.6 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Dual button doorbell?

79 components, from 38 distinct parts. The full bill of materials is listed on this page.

Where can I download the Dual button doorbell design files?

From the espena/dual-button-doorbell repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Dual button doorbell design in my own project?

Yes, under the terms of its GPL-3.0 license, which espena chose for the repository.

Can I test firmware for the Dual button doorbell 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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