IoT-DIO
Digital IO IoT Wireless Adapter

IoT-DIO is a wireless adapter for developing IoT applications for Industrial and Building Automation Systems based on the Espressif chipset ESP32. The adapter is compatible with:

• RS485
• M-Bus
• Ethernet

The library allows the implemention of IoT applications that rely on MQTT protocol via WiFi/NB-IoT/LTE Cat-M1 interfaces.

Adapter versions

The Iot-DIO wireless adapter is available in two versions developed using KiCAD 5.1 and compatible with:

• ESP32-PICO-KIT v4 - is an ESP32-based mini development board produced by Espressif. The board features integrated Wifi and BLE capabilites.
• FiPy - is an ESP32-based mini development board produced by Pycom. The board features integrated Wifi, BLE, LoRa, Sigfox, NB-IoT and LTE Cat-M1 capabilities.

Development Framework

IoT-DIO relies on the Espressif IoT Development Framework ESP-IDF, the official development framework for the ESP32 chip.

Configuration

Pinout

IO pinout (top-down):

• 0: V_BUS
• 1: M-/B-
• 2: M+/A+
• 3: GND

Functions button

The push button BT performs multiple operations depending on the pressure time Tp.

Pressure Time	Action
Tp < 1s	Performs a soft-reset of the adapter
1s < Tp < 5s	Enables the AP mode. If not previously changed, the device will be visible by default with the SSID ESP_<MAC>, where is the MAC address of the adapter network interface in hex format
5s < Tp	Performs a hard-reset of the adapter deleting the previously stored configuration

Publications

We kindly ask academic publications employing based or inspired to IoT-AIO to cite at least one of the following papers:

• M.H. Schraven, C. Guarnieri Calò Carducci, M.A. Baranski, D. Mueller, A. Monti, “Designing a Development Board for Research on IoT Appli-cations in Building Automation Systems,” 36th International Symposiumon Automation and Robotics in Construction (ISARC 2019), Banff,Canada, 2019, pp. 82-90, DOI: 10.22260/ISARC2019/0012
• C. Guarnieri Calò Carducci, A. Monti, M. H. Schraven, M. Schumacher and D. Mueller, “Enabling ESP32-based IoT Applications in Building Automation Systems,” 2019 II Workshop on Metrology for Industry 4.0 and IoT (MetroInd4.0&IoT), Naples, Italy, 2019, pp. 306-311, DOI: 10.1109/METROI4.2019.8792852

Copyright

2019-2020, Institute for Automation of Complex Power Systems, EONERC

License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Contact

• Carlo Guarnieri Calò Carducci (PhD)

Institute for Automation of Complex Power Systems (ACS)
EON Energy Research Center (EONERC)
RWTH University Aachen, Germany