IoT M2M blog

The home of free hints and tips about wireless IoT / M2M

Calculation of power consumption for a weather station on LoRa radio

On the unlicensed 869 MHz frequency band, there is a limitation in the duty cycle in Europe. Without Listen Before Talk, the channel can be used for transmissin for only 36 seconds per 1 hour (1% of 3600 seconds). If a weather station wants to send its measured value every second, this leads to a 10 ms transmission and 990 ms pause.

Calculation for a LoRa module with the following parameters

Frequency: 869 MHz
Transmission power: 14 dBm
Spreading factor: 12
Bandwith: 250 KHz
Data volume per telegram: 6 including CRC
TX: approx. 10 seconds
Pause (no RX): approx. 990 seconds
Battery: 19000 mAh @ 3.3 Volt

Screens shots of the LoRa calculation

LoRa radio for weather station on 14 dBm

LoRa radio for weather station on 14 dBm

LoRa radio for weather station on 14 dBm

LoRa radio for weather station on 14 dBm

 

Has this application piqued your interest? Do you have a wireless IoT idea? Do you plan an IoT device with embedded antennas? Do you have an IoT prototype and have a need to optimise the design or minimise the price? If you have answered YES to any one of these questions, then please do not hesitate to drop an email to harald.naumann (at) gsm-modem.de and to ask for an proposal or some engineering services to make your IoT idea a cost-effective reality.

Save

Updated: 2017-09-23 — 12:29 PM

Leave a Reply

Your email address will not be published. Required fields are marked *

Blue Captcha Image
Refresh

*

Harald Naumann © 2014 Frontier Theme