# Bee Data Logger

> ESP32-S3 based data logging board with DS3231 RTC, microSD card slot, dual STEMMA/Qwiic connectors, and LiPo charging. Achieves ~21µA deep sleep current. Open source hardware with Arduino and CircuitPython support.

## Quick Facts

- **Brand:** Smart Bee Designs
- **Board Type:** Development Board
- **Price:** ~$34.99
- **Product Readiness:** developer
- **CPU:** ESP32-S3
- **CPU Architecture:** Xtensa LX7
- **CPU Cores:** 2
- **PSRAM:** 2MB
- **Flash:** 8MB
- **Power:** USB-C 5V / 1S LiPo battery
- **Operating Voltage:** 3.3V
- **Antenna:** Built-in PCB antenna
- **SD Card:** microSD

## Connectivity

- **Wifi:** Wi-Fi 4
- **Bluetooth:** BLE 5.0

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** Yes

## Use Cases

- data-logging
- field-data-logger
- environmental-monitoring
- low-power-iot
- iot-sensor-node
- plant-monitoring

## Components

- **ESP32-S3**: Espressif ESP32-S3 system-on-chip with WiFi and Bluetooth LE 5.0, dual-core Xtensa LX7 processor at 240MHz — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=bee-data-logger&source=md-export)
- **DS3231**: Maxim DS3231 temperature-compensated real-time clock with ±2ppm accuracy and CR1220 backup battery — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdatasheets.maximintegrated.com%2Fen%2Fds%2FDS3231.pdf&ref=openhardware.directory&product=bee-data-logger&source=md-export)

## Protocols

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## Accessories

- I2C Extender Board
- I2C Extender XL
- Screw Terminal Breakout Board

## Available Software

- **[Arduino]()** (open-source)
- **[CircuitPython]()** (open-source)

## Description

# Bee Data Logger

The Bee Data Logger by Smart Bee Designs is an ESP32-S3 data logging board engineered for minimal power consumption, achieving approximately 21 microamps in deep sleep mode.

## Key Features

- **ESP32-S3 microcontroller** with WiFi and Bluetooth connectivity
- **DS3231 high-precision RTC** with CR1220 coin cell backup battery
- **MicroSD card slot** supporting up to 64GB capacity
- **Dual 600mA linear voltage regulators** — one always-on, one sleep-controlled for sensor power management
- **Two STEMMA/Qwiic I2C connectors** for easy sensor breakout board integration
- **1S LiPo battery connector** with built-in charging circuitry and on/off switch
- **Battery voltage monitoring** capability
- **USB-C interface** with detection circuitry
- **Breadboard-friendly** pin layout
- **Ultra-low power** deep sleep: ~21µA

## Software Support

- Arduino IDE compatible
- CircuitPython compatible
- Full example code available on GitHub

## Open Source

All design files are open source and available on GitHub, including schematics, PCB layout, and 3D models.

## Accessories

Smart Bee Designs also offers compatible accessories:
- I2C Extender board (holds 1 sensor)
- I2C Extender XL (holds 2 sensors)
- Screw Terminal Breakout Board

## Community

Active Discord server for user support and community discussion.

## Where to Buy

- [Tindie](https://openhardware.directory/r?to=https%3A%2F%2Fwww.tindie.com%2Fproducts%2Fsmartbee%2Fesp32-data-logger-wrtc-sd%2F&ref=openhardware.directory&product=bee-data-logger&source=md-export) — $34.99

## Resources

- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fstrid3r21%2FBee-Data-Logger&ref=openhardware.directory&product=bee-data-logger&source=md-export)
- [store](https://openhardware.directory/r?to=https%3A%2F%2Fwww.tindie.com%2Fproducts%2Fsmartbee%2Fesp32-data-logger-wrtc-sd%2F&ref=openhardware.directory&product=bee-data-logger&source=md-export)
- [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.tindie.com%2Fproducts%2Fsmartbee%2Fesp32-data-logger-wrtc-sd%2F&ref=openhardware.directory&product=bee-data-logger&source=md-export)

## Tags

`esp32-s3`, `data-logger`, `rtc`, `ds3231`, `microsd`, `low-power`, `stemma-qt`, `qwiic`, `lipo`, `open-source`, `breadboard-friendly`, `circuitpython`, `arduino`

## Images

![Bee Data Logger](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bee-data-logger/a7ef9dc2a64d.jpg)

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