iNode MCU Relay

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iNode MCU Relay is programmable, wireless Bluetooth 4.1 and WiFi relay working with sensors series iNode Care Sensor. The device is intended for the performance of the tasks of the home automation or np. the care of older persons. Allows you to  turn on/off other devices after the occurrence of specific events: eg. exceeding the specified temperature or humidity, to move the sensor or change its location.

The iNode MCU Relay functionality can be modified by the user because it runs NodeMCU ESP32. NodeMCU is an open source Lua based firmware (Lua 5.1.4) for the ESP32 SOC from Espressif and uses an on-module flash-based SPIFFS file system. It connects two wireless technologies: Bluetooth 4.1 and WiFi. Due to a security reasons the Node MCU firmware is digitally signed and can only be changed using the OTA.

iNode MQTT Monitor application enables remote control of the output in iNode MCU Relay using the MQTT protocol.

User can create your own Lua scripts and upload them to the iNode MCU using  the iNode MCU FFS application. In our technical support there are some free Lua scripts with the different functionalities e.g  iNode Central MCU - WiFi equivalent of the iNode Care GSM.



SPIFFS file system service & OTA


iNode MCU Setup

devices configuration


iNode MQTT Monitor

devices monitoring

These applications work only in Chrome or Edge web browser on different operating systems like Android, Linux and Windows 10.

Technical info:

Radio parameters:
    • RX/TX:
        ◦ Bluetooth/BLE: 2402-2480 MHz; Sensitivity @30.8% PER: –97 dBm;
        ◦ WiFi: 2412-2472 MHz / 2422-2462 MHz
    • output power (maximum):
        ◦ Bluetooth: 6,72 dBm
        ◦ BLE: 8,23 dBm
        ◦ WiFi: 16,81 dBm (802.11b); 17,60 dBm (802.11g); 18,04 dBm (802.11n20); 17,85 dBm (802.11n40);
    • modulation:
        ◦ Bluetooth: GFSK, π/4-DQPSK, 8DPSK;
        ◦ BLE: GFSK;
        ◦ WiFi: DSSS, OFDM;
    • antenna:
        ◦ PCB - internal, MIFA type, 1,6dBi;

Run options:
    • configurable from PC using Bluetooth:
        ◦ WiFi network's SSID and password;
        ◦ LUA scripts;
        ◦ NodeMCU firmware update using OTA (WiFi);

Node MCU:
    • modules:
        ◦ ADC, Bit, Bluetooth HCI interface, CRYPTO, Encoder, File, FOTA, GPIO, HTTP, LEDC, MQTT, Net, Node, SD-MMC, Struct, Timer, Uart, WiFi, time;

Power supply:
    • 6-48V DC, 43mA @ 12V (depends on firmware);

    • plastic;
    • dimensions: 55mm x 20mm x 15mm;

    • signaling by LED:
        ◦ configuration mode;
    • FLASH memory for the LUA scripts: 800kB;
    • micro SD connector (option):
        ◦ SD cards up to 32GB;
        ◦ FAT file system service;
    • output: 60V DC or 40V AC 500 mA 2.5 Ω (solid state relay type PhotoMOS);
    • terminal block connector - cage clamp, screw terminal, 2.54mm;
    • operating temperature: from -20 to 45°C;
    • humidity: 20 - 80% RHG;
    • weight: 15 g;

    • Google CHROME: Android OS, Linux, Windows 10;

    • ESP32;


PDF DocumentInstruction manual for the iNode MCU Relay.


Current firmware for iNode products is available at our technical support service:
user: inode
without a password


  • Communication with the BLE devices
  • Alarm systems
  • Medical: patient monitoring, fall detection
  • Care of older people
  • Home Automation


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Copyright © 2015-2020 ELSAT

ELSAT s.c. ul. Warszawska 32E/1 05-500 Piaseczno POLAND tel. +48 22 7164306 e-mail:


Trademarks or registered trademarks:
Bluetooth Low Energy ®, Bluetooth 4.0 ®, RFID
®,CSR®,Windows®, Windows IoT, Android, Google, Microsoft, Raspberry Pi, Domoticz,, Linux, Ubuntu, Wine, ESP32, Espressif, NodeMCU,LoRa® are used for informational purposes only.
All trademarks are property of their respective owners.

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