NETVOX Wireless Accelerometer and Surface Temperature Sensor - R718E detect the movement or vibration of the device, send a signal to the gateway for processing, and externally connect one NTC thermistor to detect the surface temperature of the measured object. It uses the SX1276 wireless communication module

Principle of Operation

The module communicates with the acceleration sensor ADXL345 in SPI communication mode; the NTC temperature detection applies the method of resistance voltage divider ADC sampling.

Example Applications

Smart home
Industrial equipment
Temperature measurement system
Other

Features of NETVOX Sensors

• Wireless range of 10 km *

• LoRaWANTM Class A compatible

• Frequency Hopping Spread Spectrum (FHSS)

• Improved interference immunity

• Improved power management for longer battery life

• Encrypt-RF™ Security (Diffie-Hellman Key Exchange + AES-128 CBC for sensor data messages)

• Battery Life* :

5 years (Conditions: ambient temperature 25 °C, 20 triggers/day, txpower = 20dBm, LoRa spreading factor SF = 10)

• Over-the-air updates (future)

• Third-Party online wireless sensor monitoring and notification system to configure sensors, view data and set alerts via SMS text and email (optional)

• Available third-party platform: Actility/ThingPark, TTN, MyDevices/Cayenne

• R718X series carry magnets which can be attached to ferromagnetic materials and objects

*Actual range may vary depending on environment.

*Battery life is determined by sensor reporting frequency and other variables

Technical Specifications

Input Power	2 x 3.6V ER14505 AA lithium batteries
Sleeping Mode	36uA
Wake up Mode	6.3mA @ 3.3V
Low Voltage Threshold	3.2V
Tx Current	120mA/3.0V
Rx Current	11mA @3.0V
Battery Life	3.4 years (Conditions: ambient temperature 25 °C, 15 min heartbeats, txpower = 20dBm, LoRa spreading factor SF = 10)

Frequency

Tx Power	19dBm±1dBm
Rx Sensitivity	-136dBm (LoRa，Spreading Factor=12，Bit Rate=293bps ) -121dBm (FSK,Frequency deviation=5kHz, Bit Rate=1.2kbps)
Antenna Type	Build-in antenna
Communication Range	Build-in antenna
Data Transfer Rate	0.3kbps～50kbps
Spread Technique	LoRa/FSK
Available Frequency	EU863-870，US902-928，AU915-928， KR920-923，AS923，CN470-510 Configured before shipment

NTC Thermistor Sensor

NTC Temperature Range	-40℃ -125℃
25 Degree Resistance Value	10k (typical)
B value B25/50	3990
Temperature Measurement Accuracy	The basic error limit of NTC thermistor: -40~125°C +-3°C; Measurement error caused by the wire : ≦ 2 ° C

3-axis Acceleration Sensor

Operating Voltage Range	1.8V-3.6V
Operating Temperature Range	-40~85 degrees
Dac Maximum Resolution	13 Bits
Communication Form	SPI communication
3-axis Acceleration Longitude	+-16g

Physical

Dimension	L:112mmW:65mmH:32mm Sensor cover size: D: 16mm*L: 34.5mm,
Weight	141g
Operating Temperature	-20℃ ～ 55℃
Environment Humidity Range	<90% RH (No condensation)
Storage Temperature	-40℃ ～ 85℃

Datasheet:

R718E.pdf

User manual:

R718E_UG.pdf

Battery Calculator:

Netvox Battery Calculator

Netvox LoRa Command Resolver:

LoRa Command Resolver

R718E - Netvox LoRaWan Wireless Accelerometer and Surface Temperature Sensor