LoRa® ELT-1 / ELT-2-HP

ELT-1 and ELT-2-HP are general LoRaWAN devices for measuring analogue or digital signals. ELT-1/ELT-2-HP can for example be used together with electricity meters, flow meters, analogue sensors, moisture sensors, temperature sensors, water leak cable or ultrasonic distance sensors. They are enclosed in an IP65 box and are designed to be outside. Inside the ELT-1/ELT-2-HP you will find three internal sensors: a temperature sensor, a humidity sensor and an accelerometer for orientation measurements. On the ELT-2-HP you will also find an additional atmospheric pressure sensor. They are powered by a 3,6V AA lithium battery. The Battery life is estimated to be up to 10 years but depends on sample interval, transmit interval, data rate, power output and environmental factors. You are welcome to use our online battery lifetime calculator. All Elsys sensors are equipped with NFC (Near Field Communication) for easy configuration with an Android phone. With our application “Sensor Settings“, you can change sample rate, data rate, encryption keys, triggers, activation and much more. All of our sensors are built on the LoRaWAN stack from Semtech. Channel planes exists for US902-928, EU863-870, AS923, AU915-928, KR920-923.

Extra features on the ELT-2-HP:

  • Dual external connections. This makes it possible to do for example: External temperature + door switch
  • Higher maximum output power.
  • Internal atmospheric pressure sensor.

Specification

  • Analog 0-10V in
  • Digital in
  • Pulse counter
  • Direct connection to S0 outputs
  • Direct connection to Decagon moisture sensors
  • Direct connection to external temperature sensor
  • Water leak sensor input
  • Direct connection to distance sensor (ultrasonic)
  • Embedded sensors for temperature, humidity, acceleration.
  • Embedded atmospheric pressure sensor (ELT-2-HP)
  • NFC for easy configuration
  • Size: 94 x 59 x 35 mm
  • Output power: +14dBm (ELT-1), +20dBm (ELT-2-HP)
  • Approx. range: 8km (ELT-1), 12km (ELT-2-HP)*
  • Battery life: 10 years**
  • Custom SW possible
  • 3.6V AA lithium battery
  • US902-928, EU863-870,AS923,AU915-928,KR920-923

* LoRa™ modulation SF10
** Depending on interval

Supported external sensors:

  • Analog input (0-10V)
  • Pulse input (pullup/pulldown), e.g. power meters.
  • DS18B20, 1-wire temperature sensor
  • Switch, normally open
  • Digital input
  • Decagon 10HS, water moisture sensor*
  • Water leak sensor/cable*
  • Maxbotix, ultrasound distance sensor*
  • GPS, with serial output*

*Only supported in firmware versions 2.1.x

elt-1_6

 

elt-1_drw

 


ELT-1 Connection

Analog input

Analog input (0-10V),  input signal between input and ground.
Select “Analog input” in android application “Sensor Settings”.

ELT-1 input is internally pulled down and the input impedance is 7.4 kohm.

Powered analog input

Analog input (0-10V),  input signal between input and ground. +3V  present at B+ pin.
Select “Analog input” in android application “Sensor Settings”. Select “Eternal startup time” in “Sensor Settings” and configure ON-time for sensor. External startup time is how long the sensor will be powered before sampling value.

ELT-1 input is internally pulled down and the input impedance is 7.4 kohm

Pulse count (pull up)

Pulse count input, input signal between input and ground
Select “Pulse input(pull up)” in android application “Sensor Settings”

ELT-1 input is internally pulled up by ~50 kohm*.

Pulse count (pull up) -S0 input

Pulse count input, S0 signal between input and ground
Select “Pulse input(pull up)” in android application “Sensor Settings”

ELT-1 input is internally pulled up by ~50 kohm*.

Pulse count (pull down)

Pulse count input, input signal between input and B+. Select “External startup time” in “Sensor Settings” and configure ON-time for always on  that is >100000ms.
Select “Pulse input(pull down)” in android application “Sensor Settings”

ELT-1 input is internally pulled down by ~50 kohm*.

Pulse count (pull down) – External pulse

Pulse count input, input signal between input and GND. Pulse signal  from 3 to 12 voltage.
Select “Pulse input(pull down)” in android application “Sensor Settings”

ELT-1 input is internally pulled down by ~50 kohm*.

Temperature sensor input (Rev B)

Temperature sensor input. ELT-1 is configured for 1-wire interface. Connect a DS18B20 compatible sensor.
Select “Temperature input” in android application “Sensor Settings”

ELT-1 input is internally pulled up by 2.2k.

*For lower values, e.g. if there are long cables, this can be adjusted with an external resistor in parallel.

 

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Customer installation


Elt-1, standard 1/2 wave antenna

Elt-1 and external temperature sensor


3D model

Sensor application

Sensor startup

sensor_startupWhen the sensor starts up it loads configuration from the internal memory  and merge it with user configuration. When the configuration is done the sensor writes the new configuration to the NFC chip. The sensor always writes new configurations to the NFC chip when something changes in the sensor or if NFC data is corrupted by a NFC writer or phone. The sensor always writes new configuration to NFC chip at startup. When configuration is done the sensor tries to join the network if OTAA (Over The Air Activation) is enabled.The sensor led flashes orange  when it tries to join a network. The sensor tries to join the network every 10 second and increases the join timer at every failed attempt by 10%,  up to maximum 1 hour. After startup,configuration and join the sensor enters sampling mode.

 


NFC read/write

When reading or writing NFC data to the sensor it starts a timer and delays its action x seconds. It delays its action because of the bad connection that can be in NFC communication. Types of bad connection can be distance, location or rapid movement. After the delay the sensor determines if the NFC data has changed or not. If the data has change the sensor reboots and starts from power up. When writing data to the sensor try to get the best connectivity as possibly. Locate the NFC antenna of the phone and sensor. Keep the 2 devices as close as possibly and don’t move them while writing or reading. When you have written data to the sensor, let the sensor reboot and restart before trying to write again. You can always validate your settings by reading the NFC data after the sensor has restarted.

sensor_nfc


Sampling mode

sampling-mode


Battery life calculator

Chose sensor (ERS,ELT-1, ESM5k) and data coding(SF7-SF12).  Fill in number of samples per hour. Use “All sensors” field to change all time settings at once.

*Receive window2 (SF9) depends on server settings .

** Battery life is a theoretical value. Battery life is negatively affected by moister, high temperature, dirt, vibration and more. Most battery manufacturer grantees maximum 10 years of battery life (storage and usage).