HenraL/panic_buttonThis 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.
Panic button tiny is an open-source printed circuit board by HenraL, from the HenraL/panic_button repository on GitHub, published under the MIT licence. It is a 2-layer board with 16 parts on 205 nets.
It is built around the ESP32-C3, SIM7670G-LNGV and DW01A, with the LIS2DE12, ME6211C33M5G-N and TP4056-42-ESOP8 among its other parts. Its parts include 7 ICs, 2 capacitors, 2 resistors, 2 connectors and 1 crystal. It belongs with the ESP32 and RISC-V boards of this library.
A small panic beacon (target: no bigger than a finger; a palm if that size can't be reached) that:
Apple UWB is out of reach (proprietary Apple U1/U2 chip + MFi program) — phone interaction is BLE only. Cost target: < $50 / unit (excluding the IoT/SIM plan).
AGENTS.md — rules and conventions for AI agents and contributors; read it first.KiCad/v1/panic_button — first board attempt (archive).KiCad/v2/dev/panic_button_dev — dev variant of the v2 circuit.KiCad/v2/tiny/panic_button_tiny — active design (KiCad 10): the tiny variant,
as small as possible.KiCad/v2/tiny/bom.md — live bill of materials (strictly the BOM).KiCad/v2/tiny/design.md — design decisions, notes and open questions.platformio/ — firmware (PlatformIO + Arduino on ESP32-C3). Comes after the circuit
planning, not in parallel.bonus/ — tools / environments / scratch (bonus/tmp/).See bom.md for parts and prices, design.md for decisions.
MIT — see LICENSE.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 22pF | PCM_SparkFun-Capacitor:C_0402_1005Metric | C1, C2 |
| 2 | 5.1k | PCM_SparkFun-Resistor:R_0402_1005Metric | R1, R2 |
| 1 | 2450AT18A0100001E | 2450AT18A0100001E:XCVR_2450AT18A0100001E | E1 |
| 1 | Battery_Cell | Connector_JST:JST_EH_S2B-EH_1x02_P2.50mm_Horizontal | BT1 |
| 1 | C3E40000121010X | C3E40000121010X:XTAL_C3E40000121010X | Y1 |
| 1 | Conn_USB_C_Socket_PowerOnly | PCM_fab:Conn_USB_C_Socket_GCT_USB4125-GF-A-0190 | J2 |
| 1 | DW01A | Package_TO_SOT_SMD:SOT-23-6 | U7 |
| 1 | ESP32-C3 | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.7x3.7mm | U5 |
| 1 | JAE_SIM_Card_SF72S006 | Connector_JAE:JAE_SIM_Card_SF72S006 | J1 |
| 1 | LIS2DE12 | Package_LGA:LGA-12_2x2mm_P0.5mm | U2 |
| 1 | ME6211C33M5 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | SIM7670G-LNGV | easyeda2kicad:LCC-124_L24.0-W24.0-P1.0-TL | U1 |
| 1 | TP4056-42-ESOP8 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm_ThermalVias | U6 |
| 1 | TPS61022 | Package_DFN_QFN:Texas_RWU0007A_VQFN-7_2x2mm_P0.5mm | U4 |
16 parts, built around the ESP32-C3, SIM7670G-LNGV, DW01A and LIS2DE12. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the HenraL/panic_button repository on GitHub, at the commit this page was made from: the board is KiCad/v2/tiny/panic_button_tiny/panic_button_tiny.kicad_pcb and its schematic KiCad/v1/panic_button/panic_button.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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