{"id":7350,"date":"2017-08-22T10:35:37","date_gmt":"2017-08-22T08:35:37","guid":{"rendered":"http:\/\/www.gsm-modem.de\/M2M\/?p=7350"},"modified":"2017-09-23T12:29:02","modified_gmt":"2017-09-23T10:29:02","slug":"calculation-of-power-consumption-for-a-weather-station-on-lora-radio","status":"publish","type":"post","link":"http:\/\/www.gsm-modem.de\/M2M\/m2m-apps\/calculation-of-power-consumption-for-a-weather-station-on-lora-radio\/","title":{"rendered":"Calculation of power consumption for a weather station on LoRa radio"},"content":{"rendered":"

\"\"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.<\/span><\/p>\n

Calculation for a LoRa module with the following parameters<\/h1>\n

Frequency: 869 MHz
\nTransmission power: 14 dBm
\nSpreading factor: 12
\nBandwith: 250 KHz
\nData volume per telegram: 6 including CRC
\nTX: approx. 10 seconds
\nPause (no RX): approx. 990 seconds
\nBattery: 19000 mAh @ 3.3 Volt
\n<\/span><\/p>\n

Screens shots of the LoRa calculation<\/h2>\n
\"LoRa

LoRa radio for weather station on 14 dBm<\/p><\/div>\n

\"LoRa

LoRa radio for weather station on 14 dBm<\/p><\/div>\n

 <\/p>\n

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.<\/p>\n

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