
User Manual for LoRaWAN End Nodes - LDDS20 -
LoRaWAN Ultrasonic Liquid Level Sensor User Manual
Table of Contents
1. Introduction ........................................................................................................................................................................ 4
1.1 What is LoRaWAN Ultrasonic liquid levelSensor .................................................................................................... 4
1.2 Features ........................................................................................................................................................................ 5
1.3 Suitable Container & Liquid ........................................................................................................................................ 5
1.4 Mechanical .................................................................................................................................................................... 5
1.5 Install LDDS20 ............................................................................................................................................................. 6
1.6 Applications ................................................................................................................................................................... 9
1.7 Precautions ................................................................................................................................................................... 9
1.8 Pin mapping and power on ........................................................................................................................................ 9
2. Configure LDDS20 to connect to LoRaWAN network ................................................................................................ 10
2.1 How it works ............................................................................................................................................................... 10
2.2 Quick guide to connect to LoRaWAN server (OTAA) ........................................................................................... 10
2.3 Uplink Payload ............................................................................................................................................................ 17
2.3.1 Battery Info ........................................................................................................................................................... 17
2.3.2 Distance ................................................................................................................................................................. 17
2.3.3 Interrupt Pin .......................................................................................................................................................... 17
2.3.4 DS18B20 Temperature sensor .......................................................................................................................... 17
2.3.5 Sensor Flag .......................................................................................................................................................... 18
2.3.6 Decode payload in The Things Network ........................................................................................................... 18
2.4 Downlink Payload ...................................................................................................................................................... 18
2.5 Show Data in DataCake IoT Server ........................................................................................................................ 19
2.6 LED Indicator .............................................................................................................................................................. 22
2.7 Firmware Change Log ............................................................................................................................................... 22
2.8 Battery Analysis ......................................................................................................................................................... 23
2.8.1 Battery Type ......................................................................................................................................................... 23
2.8.2 Battery Note .......................................................................................................................................................... 23
2.8.3 Replace the battery ............................................................................................................................................. 23
2.8.4 Battery Life Analyze ............................................................................................................................................. 24
3. Using the AT Commands .............................................................................................................................................. 24
3.1 Access AT Commands ............................................................................................................................................. 24
3.2 Set Interrupt Mode ..................................................................................................................................................... 28
4. FAQ .................................................................................................................................................................................. 28
4.1 What is the frequency plan for LDDS20? ............................................................................................................... 28
4.2 How to change the LoRa Frequency Bands/Region ............................................................................................. 29
5. Trouble Shooting ............................................................................................................................................................ 29
5.1 Why I can't join TTN V3 in US915 / AU915 bands? ............................................................................................. 29
5.2 AT Command input doesn't work ............................................................................................................................ 29
5.3 Why i always see 0x0000 or 0 for the distance value? .......................................................................................... 29
6. Order Info ........................................................................................................................................................................ 29
7. Packing Info ..................................................................................................................................................................... 29
8. Support ............................................................................................................................................................................. 30
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