Hardware

BLUEHASH Device

Open hardware platform built on ESP32-S3. WiFi, BLE, IR, RF, OLED display, 6 buttons, camera-ready. Target BOM ~$30. Fully open source.

Full specifications

Microcontroller

ESP32-S3 dual-core 240MHz

Xtensa LX7 + vector/AI instructions

RAM

512KB SRAM + PSRAM opt.

Flash

8MB with dual OTA partitions

Display

1.3″ SH1106 OLED 128×64

I2C, 160° viewing, monochrome

Buttons

OK · Back · Up · Down · B1 · B2

USB

USB-C native (no CH340 needed)

Web Serial flash + CDC serial monitor

WiFi

802.11 b/g/n 2.4GHz

Station + AP modes

Bluetooth

BLE 5.0

Central + peripheral

IR RX

38kHz TSOP receiver

NEC, SONY, RC5, RC6, Samsung, LG, RAW

IR TX

940nm IR LED

All protocols, any remote

433MHz CC1101

Garage doors, doorbells, power sockets

MicroSD

SPI FAT32

Logs, configs, saved IR/RF codes

Camera (opt.)

OV5640 5MP

JPEG/RGB565/Grayscale, up to UXGA

Buzzer

Passive piezo

Click feedback, tones, alerts

Power

LiPo 3.7V + USB-C (TP4056)

Target BOM

~$25–35 USD

License

MIT — hardware + software

GPIO pin mapping

GPIONameFunction

0BTN_OKOK / Select button

35BTN_BACKBack — hold 1.5s exits programs

36BTN_UPNavigate up

37BTN_DOWNNavigate down

38BTN_1Extra button 1

39BTN_2Extra button 2

8OLED_SDAOLED I2C data

9OLED_SCLOLED I2C clock

14IR_RXIR receiver (TSOP38238)

4IR_TXIR transmitter LED

21RF_RX433MHz RF receiver

22RF_TX433MHz RF transmitter

10SD_CSMicroSD chip select

11SD_MOSIMicroSD MOSI

12SD_CLKMicroSD clock

13SD_MISOMicroSD MISO

2LEDStatus LED

18BUZZERPassive piezo buzzer

Recommended dev boards

ESP32-S3-DevKitC-1prototyping

Best for prototyping — 44 GPIO pins, official Espressif support

Seeed XIAO ESP32-S3production

Best for final product — tiny 21×17mm, LiPo charging built in

The long-press Back exit

When a community program is running, the device flow hands full control to the program. To return to your menu without the program needing a dedicated exit button:

Short press Back

The running program receives the Back button event and handles it however it wants — navigate a submenu, cancel an action, etc.

Hold Back 1.5 seconds

The base firmware intercepts it. The program receives BH_BTN_EXIT and must clean up and return. Control returns to your device flow.