IoT Leaf

As a side product of a new project we're going to launch our first Internet of Things (IoT) hardware: the IoT Leaf. It is a small and tiny ESP32-based device which can be used as highly flexible power supply, as embedded board or as a combination of both: it consists of a board which can be cut into two pieces resulting in two different devices or which can be used as one.

Both parts together come with an incredibly small size of about 5x4 cm and support the following features:

The IoT Power Supply can be used in many different scenarios and supports the following functions:

  • Power input via micro-USB or via 6V solar panel for green and self-contained IoT applications
  • Wide input voltage range from 3.75 V to 6.0 V
  • Supports LiPo battery cell with a charging current of up to 450 mA, automatic charging and deep discharge protection
  • Provides 3.3V output with up to 500 mA current out of battery and/or power input
  • Optional: hardware switch to turn off power and to stay in a lossless battery-charging-mode

The attached IoT Control Board itself:

  • Bases on Espressif ESP32 dual-core SoC with 4 MByte flash memory, 520 kBytes SRAM and up to 240 MHz CPU-clock
  • Supports WiFi in client and access-point mode with on-board antenna
  • Provides Bluetooth and Bluetooth LE (BLE, low energy) with included antenna
  • Optional on-board Long Range Wide Area Network (LoRaWAN) support
  • Optional on-board NMEA GPS support
  • Integrated Hall-sensor and different analogue and digital interfaces
  • On-board low-power LED for basic signalling tasks
  • Can be operated with aboves power supply board or separated with other 3.3V power source
  • Easily programmable via 3.3V serial interface out of ArduinoIDE
  • Interfaces, outputs and layout can be modified according to your requirements (please contact us for details)


IoT Leaf English manual containing hardware description as well as programming interface specification:iotleaf_manual.pdf

The prototype is up and running so the board is ready for release. Depending on the public interest we will start the production of the first series sooner (or may be a bit later). For feature requests, suggestions, feedback and even to anounce your interest in this board, feel free to contact us!

Please note that HALaser Systems does not sell this board to private end users/consumers but only to companies and institutions. So requests from resellers and distributors are welcome!