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Vehicle Fuel Monitoring Device with BLE 5.0

Support BLE temp., door, wireless relay sensor

vehicle fuel monitoring device

Vehicle Fuel Monitoring Device with BLE 5.0

Vehicle fuel monitoring device UM770 is an advanced GPS tracker with advanced features that no other device include. With BLE 5.0 module, it can connect with wireless bluetooth sensors, including BLE door sensor, BLE temperature monitoring sensor, BLE driver identification button, BLE tire pressure monitoring and BLE wireless relay. Both BLE temperature monitoring sensor and wireless relay can work also without connecting with GPS tracker UM770.

With charged advanced  GPS web tracking software, the vehicle fuel monitoring device UM770 can support 2 tanks fuel monitoring at same time, by connecting with ultrasonic fuel sensor with analog voltage input, and the other with RS232 input. Free tracking software support only 1 tank fuel monitoring.

It supports also anti-Jammer alarm and operation. When signal jamming is detected, tracker can automatically send Jammer detected alarm and control relay to cut off engine. The trigger can either be Jammer or Speed or ACC status or Power cut alarm, etc.

It supports relay control triggered by Speed, so as to work as a GPS integrated speed limiter.


  1. Quad band GSM/GPRS 850/900/1800/1900 MHz
  2. Support GNSS, GPS and Beidou positioning system, mainly GNSS
  3. High Performance Internal Antennas
  4. Flat size design and built in 260mAh battery
  5. Built in memory to store 60,000 way points at GSM blind area
  6. Support wireless control with built-in BLE 5.0 module
  7. Anti-theft alarm: When vehicle engine turns on, sends ACC ON alarm
  8. Towing alarm: When vehicle is moved certain distance, send towing alarm
  9. Over speed alarm
  10. External power low alarm: If vehicle battery power is low to preset value, device sends alarm
  11. Vibration alarm: When vehicle ignition is off, vibration detected, device sends alarm
  12. Jammer detection alarm: when device GSM signal becomes weak than preset value, device sends alarm
  13. Driver behavior monitoring: Harsh driving, acceleration and collision monitoring via acceleration
  14. Authorized driving: Only driver with correct driver information can start vehicle engine, including BLE tag, RFID card, Finger print.
  15. Engine cut off with relay with output 1. Wireless BLE relay is available .Device has 2 output.
  16. Temperature monitoring with wireless BLE sensor.
  17. Door status monitoring with wireless BLE sensor.
  18. Tire pressure monitoring with wireless TPMS sensor.
  19. Support reports to 2 IP at same time.
  20. OTA-support device firmware upgrading
  21. Support dual tank monitoring with analog input and RS232 to connect 2 fuel sensors
  22. Support output control by alarm trigger, like Speed, Jammer, Geo-fence, External power cut, Engine status, which makes device a perfect GPS integrated Speed limiter and vehicle anti-theft device
GSM Specifications
FrequencyQuad band: 850/900/1800/1900 MHz
GPRSGPRS multi-slot class 12
RMS Phase Error5 deg
Max Out RF PowerGSM850/GSM900: 33.0±2 dBm

DCS/PCS: 30.0±2 dBm

Dynamic Input Range-15 ~ -108 dBm
Receiver SensitivityClass Ⅱ RBER 2% (-107 dBm)
Stability of Frequency< 2.5 ppm
Max Frequency Error±0.1 ppm
GNSS Specifications
GNSS ChipsetAll-In-One GNSS receiver
Parallel GNSSGPS+Glonass+Galileo+Beidou
Receiver type:33 tracking / 99 acquisitions- channel GNSS receiver
SensitivityCold start: -148 dBm

Reacquisition: -163 dBm

Tracking: -165 dBm

Position Accuracy (CEP)Autonomous: < 2.5m
TTFF (Open Sky)Cold start: < 28s Warm start: < 26s EPO assist: < 13s Hot start: < 1s
Interfaces
RS2321 RS232 Connector
Digital Inputs (2)1 digital input for ignition detection

1 digital input for normal use (Door/AC…)

Digital Outputs1 digital output for relay control
Analog Input (2)1 analog voltage input for fuel detection, etc. 1 analog resistance input for temperature, etc.
GSM/GNSS/Bluetooth AntennaInternal only
Indicator LEDGSM, GNSS and Power
Bluetooth4.0
General Specifications
Sleep Current7mA/12V, 5mA/24V
Work Current25mA/12V,  15mA/24V
Dimensions81mm*39mm*13mm 
Weight55g
Backup BatteryLi-Polymer 250 mAh/ 3.7V
Operating Voltage7V to 32V DC
Operating Temperature-30℃ ~ +80℃ (-22°F ~ 176°F)
Storage Temperature-40℃ ~ +85℃ (-40°F ~ 185°F)
Air Interface Protocol
Transmit ProtocolTCP, UDP, SMS
Protocol Check & Encryption SupportMD5/ AES256
RS232  Accessories SupportYes
BLE Accessories SupportYes
Scheduled Timing ReportReport position and status at preset intervals
Geo-fenceGeo-fence alarm and parking alarm  support up to 64 internal geo-fence regions
Low Power AlarmAlarm when backup battery is low
Power on ReportReport when the tracker is powered on
Tow AlarmFrom internal 3-axis accelerometer
Driving Behavior MonitoringAggressive driving behavior detection, e.g. harsh braking and acceleration
Crash DetectionAccident data collection for reconstruction and analysis
Special AlarmSpecial alarm based on the digital/analog inputs
Remote ControlOTA control of outputs
GSM Signal Jamming DetectionReport GSM jammer
Data Roaming ControlAvoid additional data consumption

Since GPS Tracker UM770 support Bluetooth 5.0, we develop a couple of wireless bluetooth sensors to work with it, including wireless relay, wireless temperature sensor, wireless door sensor.

User manual Download:

Wireless relay User Manual V1.1

Wireless Tempe. Sensor User Manual V1.1

Wireless Door Sensor User Manual V1.1

Flayer Download:

Wireless Relay V1.1

Wireless BLE Temperature&Humidity sensor

Wireless BLE Door sensor

Send SMS command to activate Jammer detection, as below:

SMS command formatIntroduction
JAMMERD,0000,A,B,C,D#1. This function only works when vehicle is ignition off or idling
2. A=0/1, 1=enable, 0=disable, default is 0
3. B, network signal strength, unit is %, range is 50-100
When device network connection(to server) is down but current network signal strength>B, device would determine jamming is happening. Suggestion value B=80
4. C, jamming duration, range 1-255, unit is second. If B happened and continued C seconds, device will send a jamming detected alarm to server. Suggestion value C=30
5. D, network recover duration, range 1-255, unit is second. If network connection keeps alive for D seconds after jamming detected, device will send a jamming disappear alarm to server. Suggestion value D=30

You will need setup right signal strength per local GSM coverage signal to determine jammer or not, otherwise it will affect device normal usage.

Send command to activate Relay control, relay is connected with GPS Tracker Digital Output 1. Make sure jammer detection command is sent first.

SMS command format Introduction
JAMMERA,0000,A#1. A=0, doesn’t enable digital output1 when jamming detected
2. A=1, enable digital output1 when jamming detected, and recover digital output 1 when jamming disappeared, control relay to cut off engine.

The exact command is: JAMMERA,0000,1#

To protect vehicle, user can setup ACC on alarm and cut off engine in case of theft.

1 Send command to activate ACC on alarm

SMS commandIntroduction
ANTITHEFT,0000,A#Antitheft alarm
1. A=0, disable
2. A=1, enable

The example command here is: ANTITHEFT,0000,1#

2 Send command to activate Relay control once ACC is ON

SMS commandIntroduction
DOUT_CONTROL,0000,A,B,C#Alarm based DOUT trigger control
1. A=the alarm code(HEX), refer to the alarm code list
2. B=DOUT control number
B=0, doesn’t trigger any DOUT
B=1, trigger DOUT1
B=2, trigger DOUT2
B=3, trigger DOUT1 and DOUT2
3. C=the DOUT “on” period. Unit is second. Range 0-65535
Either B or C =0, when alarm happened, it will trigger the DOUT.

The example command here is: DOUT_CONTROL,0000,10,1,36000

In this command, when device ACC turns on without authorization, tracker shall control relay to cut off engine for 1 0hrs.

Vehicle fuel monitoring device needs to connect with fuel sensor in order to monitor vehicle fuel consumption, either vehicle own fuel sensor or external fuel sensor. No matter which type of fuel sensor, it should give out analog voltage signal when fuel amount changes.

We offer 3 type of fuel sensors, and all will need hole drilling on tank.

1 Normal fuel probe, accuracy error is 10mm

2 Capacitance fuel probe, accuracy error is 1mm, and it is cuttable to suit different length

3 Ultrasonic fuel sensor, accuracy error is 0.1mm. It is to be installed on top of tank.

Click to check Fuel sensor connection diagram.

1 Send command to setup a speed limit.

SMS command formatIntroduction
SPEED,0000,A#Over speeding alarm
1. A, speed threshold, the unit is KM/h, range is 0-65535
2. A=0, disable alarm, default is 0
3. When the vehicle speed is ≥A, alarm will be triggered

The example command is SPEED,0000,80 (If you need restrict vehicle speed at 80KM/H)

2 Send command to activate relay control when speed limit is triggered.

SMS command formatIntroduction
DOUT_CONTROL,0000,A,B,C#Alarm based DOUT trigger control
1. A=the alarm code(HEX), refer to the alarm code list
2. B=DOUT control number
B=0, doesn’t trigger any DOUT
B=1, trigger DOUT1
B=2, trigger DOUT2
B=3, trigger DOUT1 and DOUT2
3. C=the DOUT “on” period. Unit is second. Range 0-65535
Either B or C =0, when alarm happened, it will trigger the DOUT.

The example command is: DOUT_CONTROL,0000,4,1,2

In this command, when speed limit is reached, GPS tracker will command relay to cut off fuel supply for 2 secs, so as to slow down vehicle speed. Long interval may shutdown engine.

IMPORTANT NOTICE: To limit speed, please connect relay to cut off fuel other than electricity. Electricity cut off shall make vehicle stop suddenly and may cause serious accidents. Please test this function before apply it. The test speed limit has better to be under 30KM/H.

Click to check Relay connection diagram.

Per the Alarm Code(HEX), we can use any alarm as a trigger so as to control relay to execute.

Examples:

If the device trigger over speed alarm, cut off engine

If the device trigger geo-fence alarm, cut off engine

If the device trigger power cut alarm, cut off engine

Alarm Code(HEX)Alarm Code(DEC)Alarm
11External Power Disconnected
22Build-in battery low power alarm
33SOS
44Over Speed
55Into Geofence
66Out of Geofence
77Towing
88Vibration
99Device get address for postion SMS
1016Anti-theft alarm
1117Ananlog input1 voltage increase
1218Ananlog input1 voltage decrease
1319Ananlog input2 voltage increase
1420Ananlog input2 voltage decrease
1521Ignition on
1622Ignition off
1723I/O(Bit 13), from 0 to 1
1824I/O(Bit 13), from 1 to 0
1925One idling start
2032One idling end
2133Signal jamming start, this need config
2234Signal jamming end, this need config
2335External power recover
2436External power lower than preset external power , this need config
2537Digital input3 on
2638Digital input3 off
2739Digital input4 on