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Panic button

HenraL·panic_button·KiCad/v1/panic_button/panic_button.kicad_pcb

Panic button PCB layout, top view — open source ESP32 board by HenraL

About the Panic button PCB

Panic button is an open source ESP32 PCB design by HenraL, published on GitHub under the MIT license. It is a 2-layer board measuring 68.2 × 63.3 mm, with 43 components from 26 distinct parts.

Its main chip is the ESP32-C3-DevKitM-1, from the ESP32 family. Other key parts include the SIM7600G-H and BD33GA5WEFJ. By type, the board carries 14 resistors, 11 diodes, 6 capacitors, 5 switches, 3 ICs and 2 connectors.

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

From the project

This is an attempt at creating a box that aims to allow you to broacast your location to someone close like the other deivces (air tag, tile, etc) but as it is not a brand and uses the internet instead of ble and an proprietary device grid (airtag) it should not be very obvious.

A small panic beacon (target: no bigger than a finger; a palm if that size can't be reached) that:

1. Updates its position towards a server. 2. If that is not available, sends an SMS (or similar). 3. Regardless of the above, advertises a BLE beacon (Apple Find My-style, Android hub, Samsung if they stray) so nearby phones can interact with it without any app.

Main components on the Panic button

SIM7600G-HBD33GA5WEFJESP32-C3-DevKitM-1

Panic button bill of materials (BOM)

43 components, 26 distinct parts.

QtyPartRefs
1
SIM7600G-H
IC1
1
BD33GA5WEFJ
U1
1
ESP32-C3-DevKitM-1
U2
2
JST_02
J1, J2
1
1206L050/15YR
F1
1
potentiometer_RM065
RV1
3
Push_Button
SW1, SW2, SW5
2
Slide_Switch_SPDT_P3mm_10x5x10mm
SW3, SW4
3
SS14
D1, D3, D8
1
1N6284A
D2
2
LED red
D4, D10
1
LED orange
D5
1
LED yellow
D6
2
LED green
D7, D9
1
LED blue
D11
1
C0603C471J5GACTU
470pF_0603_25V
Kemet
C1
3
100nF_Ceramic
C2, C3, C5
1
1000uF_25V
C4
1
CC0603JRNPO9BN101
100pF_0603_50V
Yageo
C6
2
RT0402FRE0710KL
10k_0402
Yageo
R1, R14
Show 6 more
QtyPartRefs
4
330Ω
R2, R7, R10, R11
4
10kΩ
R3, R8, R9, R12
1
15kΩ
R4
1
20kΩ
R5
1
27kΩ
R6
1
100k
R13

Panic button design files

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

Panic button: common questions

What microcontroller does the Panic button use?

The Panic button is built around the ESP32-C3-DevKitM-1, from the ESP32 family.

How big is the Panic button PCB?

The Panic button measures 68.2 × 63.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Panic button?

43 components, from 26 distinct parts. The full bill of materials is listed on this page.

Where can I download the Panic button design files?

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

Can I use the Panic button design in my own project?

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

Can I test firmware for the Panic button 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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