SE050 Secure Element
NXP EdgeLock SE050C2 on the shared I²C bus at 0x48, host-reset from GPIO8. Keys are generated and used inside the element — they never reach the application processor.
SUPERTEAM INDONESIA // HACKER HOUSE BALI
Hacker House
Badge
A handheld console
you wear to the hackathon.
Shaped like a game console and built like a dev board — a 2.8" touch display, a full D-pad and four action buttons, an NXP secure element, PDM microphone and Li-Po power, all on a two-layer board you can hang around your neck.
Superteam Indonesia · Hacker House Bali
Co-hosted by Solana Foundation
Hardware by SkyRizz
2.8"
SPI TFT + Touch
ESP32-S3
N16R8 Module
8
D-pad + ABXY
SE050
Secure Element
94
Components
Li-Po
USB-C Charging
THE CORE
ESP32-S3.
16 MB and room to move.
An ESP32-S3-WROOM-1-N16R8 sits at the bottom-right of the back face, its PCB antenna aimed at the board edge with both copper pours cut back around it. 16 MB of flash and 8 MB of octal PSRAM give you enough headroom for framebuffers, audio buffers and a real UI.
The octal PSRAM claims GPIO35–37 internally, so those three are off the table. Everything else is either wired to a peripheral or broken out to the expansion header along the top edge.
MCU MODULE
ESP32-S3
DISPLAY MODULE
J5 · 18-WAY FPC
320 × 240
2.8" LANDSCAPE
BusSPI
TouchTSC2007 · 0x4A
BacklightGPIO7 · PWM
Active area57.8 × 43.2 mm
DISPLAY & TOUCH
A screen on the front.
Its ribbon on the back.
The 2.8" panel is bonded to the front face, but its 18-pin FPC tail threads through a 3.56 × 16.26 mm slot cut in the middle of the board to reach connector J5 on the reverse — so the front stays clean and every wire lives behind the badge.
Touch is four-wire resistive, read by a TSC2007 on the shared I²C bus with its PENIRQ on GPIO5. Backlight is transistor-driven from GPIO7, so drive it off an LEDC channel for dimming.
CONTROLS
Eight buttons.
One interrupt line.
A D-pad on the left, four action buttons on the right — 6 × 6 mm tactiles placed at 45° and 135° so each cluster forms a diamond on the front face. None of them are wired to the MCU directly.
All eight run through a TCA9534 I²C expander at 0x20. Each pin has a 10 kΩ pull-up, so pressed reads as 0, and a single open-drain interrupt on GPIO4 tells you when anything changed. That frees eight GPIOs and turns the whole control surface into one register read.
TCA9534 · 0x20 · PRESSED = 0
UPP0
LEFTP1
RIGHTP2
DOWNP3
YP4
XP5
BP6
AP7
Change interrupt on GPIO4 — open-drain, no external pull-up, so enable the internal one.
ONBOARD PERIPHERALS
Sensors, sound
and a secure element.
Ninety-four parts across two layers — everything the badge needs to see, hear, glow, beep and prove who it is, with no daughterboards.
PDM Microphone
Knowles SPH0641LM4H-1 on the front edge. Bottom-port, so a 0.6 mm acoustic hole is drilled clean through the board — sound enters from behind. Clock GPIO47, data GPIO48.
Humidity & Temp
HTU21D in the top-left corner beside the buzzer, fixed at I²C address 0x40. Ambient sensing for the badge to log, display, or sign and push on-chain.
RGB LED
A single WS2812-compatible LED on the right edge, driven from GPIO2 over RMT. DOUT is left unconnected — it is a chain of one, addressable like any NeoPixel.
Magnetic Buzzer
Low-side driven by an SS8050 from GPIO6, fed from VSYS through a 22 Ω series resistor. Passive transducer — feed it a square wave off LEDC and it sings.
Expansion Header
A 1×10 2.54 mm header along the top edge — the only through-hole part on the board. Eight free GPIOs plus VSYS and GND, each pin labelled on the silkscreen.
I²C BUS
SCL GPIO9 · SDA GPIO10 · 2.2 kΩ pull-ups
0x20
TCA9534
8 face buttons
0x40
HTU21D
Humidity + temperature
0x48
SE050C2
Secure element
0x4A
TSC2007
Resistive touch
ONE BUS, FOUR DEVICES
Two pins carry
most of the badge.
Buttons, touch, environment and cryptography all hang off the same two wires — GPIO9 and GPIO10, pulled up with 2.2 kΩ. Four fixed addresses, no conflicts, no bit-banging.
The two interrupt lines that go with them — button change on GPIO4 and pen-down on GPIO5 — are both open-drain with no external pull-ups. Enable the internal ones in firmware and they behave.
UART / HID
A physical switch
for the USB pair.
The USB-C data lines land on a DPDT slide switch on the back, silkscreened UART and HID. Flip it one way and the pair goes to a CH340C bridge — the host sees a serial port and esptool's auto-reset circuit works normally.
Flip it the other way and the pair goes straight to the ESP32-S3's native USB peripheral through 22 Ω series resistors: USB-Serial/JTAG, TinyUSB CDC, HID or MSC. No firmware flag, no reboot — just a switch you can feel.
S1 · DPDT DATA MUX
USB-C · D+ / D−
UART
CH340C
Serial port
auto-reset works
auto-reset works
HID
Native USB
JTAG · TinyUSB
GPIO19 / 20
GPIO19 / 20
POWER PATH
USB-C 5 V or 1S Li-Po
U1
MCP73831
100 mA charger · 4.20 V
U7
DW03D
Cell protection
Q3/Q5
AO3401A
Master switch + USB cutover
U2
ME6211C33
3V3 rail
GPIO1
ADC1_CH0
VSYS ÷ 2 sense
POWER
Runs on a cell.
Charges while off.
Two back-to-back P-channel MOSFETs sit between the battery and the system rail. The slide switch on the right edge gates the battery; a second FET drops it out entirely the moment USB is plugged in, so the badge runs off VBUS through a Schottky instead.
Two consequences worth knowing: the badge always powers up on USB regardless of the switch, and because the charger hangs off VBUS ahead of the switch, it still charges with the badge switched off. A red LED means charging, blue means done.
WHAT ATTENDEES BUILD
A badge that outlives
the event.
Screen, controls, radio, secure element and a battery — the same ingredients as a handheld console, handed to a room full of builders for a weekend.
01
Pocket Signer
Hold a Solana keypair inside the SE050 and confirm transactions on the 2.8" screen with the A button. The private key never leaves the element, and the badge never needs a host.
02
Handheld Games
A D-pad, four action buttons, a 320 × 240 panel and 8 MB of PSRAM. Write a game jam entry on Friday and hand it around the room on Saturday.
03
Badge-to-Badge
Wi-Fi and BLE are already on the module. Trade signed messages, collect proof-of-meeting attestations, or run a room-wide leaderboard over ESP-NOW.
04
Voice Interface
The PDM microphone feeds an I²S peripheral in PDM-RX mode. Run wake-word detection on the S3 and trigger an on-chain action without touching a button.
05
Sensor Node
Log humidity and temperature from the HTU21D, sign each reading with the secure element, and push tamper-evident environmental data to a Solana program.
06
Your Own Peripheral
Eight unused GPIOs on the top header, plus VSYS and GND. Solder on a sensor, a radio, a servo — the badge becomes whatever the weekend needs.
OPEN HARDWARE
KiCad 10 source.
Documented to the pin.
Schematic, PCB layout and a hardware README that walks every rail, every I²C address and every GPIO on the module — including the three the PSRAM eats. Fabrication bundles are checked in alongside the design, so the badge can be re-ordered as-is.
github.com/SkyRizzAI/hackerday-superteam →
SkyRizzAI / hackerday-superteam
- DIR hardware/
- ├── HackerHouse-Badge.kicad_pro
- ├── HackerHouse-Badge.kicad_sch
- ├── HackerHouse-Badge.kicad_pcb
- ├── production/
- └── README.md
BADGES FOR YOUR EVENT
Running a hacker house?
We build the hardware.
SkyRizz designs and manufactures custom conference badges — from schematic to assembled boards in attendees' hands.