HardLabs

Zap bracelet

Raf3-Tech·zap-bracelet·hardware/ZapBracelet.kicad_pcb

Zap bracelet PCB layout, top view — open source ESP32 board by Raf3-Tech

About the Zap bracelet PCB

Zap bracelet is an open source ESP32 PCB design by Raf3-Tech, published on GitHub. It is a 4-layer board measuring 30.1 × 12 mm, with 34 components from 20 distinct parts.

Its main chip is the ESP32-C3, from the ESP32 family. Other key parts include the ST25R3911B, ATECC608A, DRV2605L, MCP73831 and AP2112K-3.3. By type, the board carries 15 capacitors, 10 resistors, 6 ICs, 1 connector and 1 diode.

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

From the project

NFC wearable for Malawi — tap to pay with Airtel Money or TNM Mpamba, and extend Afrimax WiFi. Built with Diode Computers' Zener PCB tooling, Rust firmware on ESP32-C3, and a TypeScript payment layer.

Zero-friction Access & Payment — an NFC wearable for the Malawian market.

Tap a ZAP bracelet against a reader to trigger a contactless Airtel Money or TNM Mpamba payment, or to purchase an Afrimax WiFi session. The entire stack runs on Malawi Kwacha (MWK). No USD. No floats.

- Project Overview - Project Boundaries - Repository Structure - Architecture - Tech Stack - Hardware Overview - Getting Started - Firmware - Backend - Payment Sidecar (Adapters) - Dashboard - Full Stack via Docker Compose - Environment Variables - API Reference - Database Schema - Deployment

Main components on the Zap bracelet

ESP32-C3ST25R3911BATECC608ADRV2605LMCP73831AP2112K-3.3

Zap bracelet bill of materials (BOM)

34 components, 20 distinct parts.

QtyPartRefs
1
ESP32-C3
U1
1
ST25R3911B
U2
1
ATECC608A
U3
1
DRV2605L
U4
1
MCP73831
U5
1
AP2112K-3.3
U6
1
LiPo_JST-PH
J1
1
TestPoint
TP_3V3
1
LED_RGB_0606
D1
3
10uF
C1, C5, C10
5
100nF
C2, C6, C7, C9, C11
2
1uF
C3, C4
2
4.7uF
C8, C12
3
DNI
C13, C14, C15
3
33
R1, R2, R3
2
10k
R4, R5
2
4k7
R6, R7
1
20k
R8
1
100k
R9
1
0R
R10

Zap bracelet design files

The KiCad project lives in the Raf3-Tech/zap-bracelet repository on GitHub; these links point at the commit this page was built from.

Zap bracelet: common questions

What microcontroller does the Zap bracelet use?

The Zap bracelet is built around the ESP32-C3, from the ESP32 family.

How big is the Zap bracelet PCB?

The Zap bracelet measures 30.1 × 12 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Zap bracelet?

34 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the Zap bracelet design files?

From the Raf3-Tech/zap-bracelet repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Zap bracelet design in my own project?

The repository has no license, so all rights stay with Raf3-Tech. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Zap bracelet 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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