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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
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.
Input Power | 2 x 3.6V ER14505 AA lithium batteries |
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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) |
Tx Power | 19dBm±1dBm |
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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 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 |
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 |
Dimension |
L:112mm*W:65mm*H: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℃ |
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