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Cellular IoT project enables remote sensor monitoring without internet service

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Cellular IoT Monitor  

Transmit sensor data from remote locations without internet. Transfer data to email, text, Google Sheets, IFTTT, Home Assistant, and more for less than $2 per month.


How It Works

An inexpensive IoT SIM card gains access to the cloud via a cellular connection.

The HUB connects to the cellular network or wifi or both.

The HUB can operate as a stand-alone unit with its own sensors.

The HUB can also collect data wirelessly from separate sensor platforms.

The hub software - AmbientHUB - and the sensor software - AmbientAP - are written in C++ with the using the Arduino IDE.

The AmbientHUB software controls an ESP32 micro-controller connected with onboard sensors and an optional OLED display.


Hands on Technology presentation of 2/2/2022

Available here

Additional development since then is reflected below and in the software.



Tested With



Supported Protocols

The AmbientHUB software can receive the AmbientAP sensor data using the listed protocols.



Formatting Options

The AmbientHUB software collects the sensor values for hourly transmission via the Hologram IoT cellular platform to the listed website services.

Supported Services via Cellular

Supported Services via Wifi

  • Home Assistant or any MQTT Broker using a local wifi router

  • Telegram for tailored commands



Threshold Alert

The AmbientHUB software provides
immediate alerts when sensors cross adaptive thresholds.


Builtin Modules