Last modified by Mengting Qiu on 2024/03/07 08:41
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From version < 140.5 >
edited by Xiaoling
on 2022/06/10 17:12
To version < 145.1 >
edited by Xiaoling
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Change comment: Uploaded new attachment "image-20220610172924-5.png", version {1}

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538 538  
539 539  
540 540  
541 -
542 542  === 2.6.4  AU915-928(AU915) ===
543 543  
544 544  (((
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695 695  
696 696  
697 697  
698 -
699 699  === 2.6.6  KR920-923 (KR920) ===
700 700  
701 701  (((
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768 768  
769 769  
770 770  
771 -
772 772  === 2.6.7  IN865-867 (IN865) ===
773 773  
774 774  (((
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805 805  
806 806  
807 807  
808 -
809 809  == 2.7  LED Indicator ==
810 810  
811 -The LLDS12 has an internal LED which is to show the status of different state.
807 +The LDDS75 has an internal LED which is to show the status of different state.
812 812  
813 -* The sensor is detected when the device is turned on, and it will flash 4 times quickly when it is detected.
809 +
810 +* Blink once when device power on.
811 +* The device detects the sensor and flashes 5 times.
812 +* Solid ON for 5 seconds once device successful Join the network.
814 814  * Blink once when device transmit a packet.
815 815  
815 +
816 +
816 816  == 2.8  ​Firmware Change Log ==
817 817  
818 818  
819 -**Firmware download link: **[[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LLDS12/Firmware/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LLDS12/Firmware/]]
820 +**Firmware download link: **[[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Firmware/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Firmware/]]
820 820  
821 821  
822 822  **Firmware Upgrade Method: **[[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
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823 823  
824 824  
825 825  
826 -= 3.  LiDAR ToF Measurement =
827 +== 2.9  Mechanical ==
827 827  
828 -== 3.1 Principle of Distance Measurement ==
829 829  
830 -The LiDAR probe is based on TOF, namely, Time of Flight principle. To be specific, the product emits modulation wave of near infrared ray on a periodic basis, which will be reflected after contacting object. The product obtains the time of flight by measuring round-trip phase difference and then calculates relative range between the product and the detection object, as shown below.
830 +[[image:image-20220610172003-1.png]]
831 831  
832 -[[image:1654831757579-263.png]]
832 +[[image:image-20220610172003-2.png]]
833 833  
834 834  
835 +== 2.10  Battery Analysis  ==
835 835  
836 -== 3.2 Distance Measurement Characteristics ==
837 +=== 2.10.1  Battery Type ===
837 837  
838 -With optimization of light path and algorithm, The LiDAR probe has minimized influence from external environment on distance measurement performance. Despite that, the range of distance measurement may still be affected by the environment illumination intensity and the reflectivity of detection object. As shown in below:
839 +The LDDS75 battery is a combination of a 4000mAh or 8500mAh Li/SOCI2 Battery and a Super Capacitor. The battery is non-rechargeable battery type with a low discharge rate (<2% per year). This type of battery is commonly used in IoT devices such as water meter.
839 839  
840 -[[image:1654831774373-275.png]]
841 841  
842 +The battery related documents as below:
842 842  
843 -(((
844 -(% style="color:blue" %)**① **(%%)Represents the detection blind zone of The LiDAR probe, 0-10cm, within which the output data is unreliable.
844 +* (((
845 +[[ Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],
845 845  )))
846 -
847 -(((
848 -(% style="color:blue" %)**② **(%%)Represents the operating range of The LiDAR probe detecting black target with 10% reflectivity, 0.1-5m.
847 +* (((
848 +[[Lithium-Thionyl Chloride Battery  datasheet>>url:https://www.dragino.com/downloads/downloads/datasheet/Battery/ER26500/ER26500_Datasheet-EN.pdf]],
849 849  )))
850 -
851 -(((
852 -(% style="color:blue" %)**③ **(%%)Represents the operating range of The LiDAR probe detecting white target with 90% reflectivity, 0.1-12m.
850 +* (((
851 +[[Lithium-ion Battery-Capacitor datasheet>>url:http://www.dragino.com/downloads/downloads/datasheet/Battery/SPC_1520_datasheet.jpg]], [[Tech Spec>>url:http://www.dragino.com/downloads/downloads/datasheet/Battery/SPC1520%20Technical%20Specification20171123.pdf]]
853 853  )))
854 854  
854 + [[image:image-20220610172400-3.png]]
855 855  
856 -(((
857 -Vertical Coordinates: Represents the radius of light spot for The LiDAR probe at the different distances. The diameter of light spot depends on the FOV of The LiDAR probe (the term of FOV generally refers to the smaller value between the receiving angle and the transmitting angle), which is calculated as follows:
858 -)))
859 859  
860 860  
861 -[[image:1654831797521-720.png]]
858 +=== 2.10.2  Replace the battery ===
862 862  
860 +(((
861 +You can change the battery in the LDDS75.The type of battery is not limited as long as the output is between 3v to 3.6v. On the main board, there is a diode (D1) between the battery and the main circuit. If you need to use a battery with less than 3.3v, please remove the D1 and shortcut the two pads of it so there won’t be voltage drop between battery and main board.
862 +)))
863 863  
864 864  (((
865 -In the formula above, d is the diameter of light spot; D is detecting range; β is the value of the receiving angle of The LiDAR probe, 3.6°. Correspondence between the diameter of light spot and detecting range is given in Table below.
865 +
866 866  )))
867 867  
868 -[[image:1654831810009-716.png]]
869 -
870 -
871 871  (((
872 -If the light spot reaches two objects with different distances, as shown in Figure 3, the output distance value will be a value between the actual distance values of the two objects. For a high accuracy requirement in practice, the above situation should be noticed to avoid the measurement error.
869 +The default battery pack of LDDS75 includes a ER18505 plus super capacitor. If user can’t find this pack locally, they can find ER18505 or equivalence, which will also work in most case. The SPC can enlarge the battery life for high frequency use (update period below 5 minutes)
873 873  )))
874 874  
875 875  
876 876  
877 -== 3.3 Notice of usage: ==
874 += 3.  Configure LLDS12 via AT Command or LoRaWAN Downlink =
878 878  
879 -Possible invalid /wrong reading for LiDAR ToF tech:
880 -
881 -* Measure high reflectivity object such as: Mirror, Smooth ceramic tile, static milk surface, will have possible wrong readings.
882 -* While there is transparent object such as glass, water drop between the measured object and the LiDAR sensor, the reading might wrong.
883 -* The LiDAR probe is cover by dirty things; the reading might be wrong. In this case, need to clean the probe.
884 -* The sensor window is made by Acrylic. Don’t touch it with alcohol material. This will destroy the sensor window.
885 -
886 -= 4.  Configure LLDS12 via AT Command or LoRaWAN Downlink =
887 -
888 888  (((
889 889  (((
890 890  Use can configure LLDS12 via AT Command or LoRaWAN Downlink.
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