Low power IoT devices and the possible use case in the grid

Introduction

Comparison of LoRaWAN and NB-IOT technologies

Exploring LoRa(WAN)

The first cheap LoRaWAN module we ordered (with some modifications)
Measuring the power quality and power usage

Commercial parties

Now the real development begins!

  • LoRa(WAN) module (RFM95)
  • Microprocessor (Atmega328P)
  • A very efficient power regulator
  • A programming header
  • An antenna connector
PCB Design
First produced board

Choosing a battery

The potential of LoRa(WAN)

  1. Localization of devices
(Please don’t mind my drawing skills)
Multiple devices behind multiple transformers connected via the medium voltage grid

The directly controlled charge station

Sneak preview of the charge station with the LoRa module

Lessons learned and things to consider

Unlicensed spectrum

Duty cycle, bit rate and range

OTAA or ABP

Low power, real lower power and the lowest power

  1. A timer chip that cuts off all power to the micro controllers. The TPL5111 Nano-Power System Timer for Power Gating
  2. A LDO with a very low dropout with an output of 2.8V, enough to run the micro controller and the RFM95W. The SGM2019–2.8YN5G

Antenna and epoxy

The module in epoxy, it was kinda fun to see the temperatures rise when the epoxy hardened

Limited but reliable!

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Harm van den Brink

Harm van den Brink

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Cyber security, smart grids, electric vehicles, distributed ledger technology, hardware. Owner of Innoshift B.V. Articles on personal title.