Last modified by Mengting Qiu on 2025/02/26 15:04
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From version < 147.2 >
edited by Xiaoling
on 2022/06/10 17:34
To version < 143.4 >
edited by Xiaoling
on 2022/06/10 17:25
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... ... @@ -58,6 +58,7 @@
58 58  * 4000mAh or 8500mAh Battery for long term use
59 59  
60 60  
61 +
61 61  == 1.3  Specification ==
62 62  
63 63  === 1.3.1  Rated environmental conditions ===
... ... @@ -99,6 +99,7 @@
99 99  * Bottom water level monitoring
100 100  
101 101  
103 +
102 102  == 1.6  Pin mapping and power on ==
103 103  
104 104  
... ... @@ -240,6 +240,7 @@
240 240  * If the sensor value lower than 0x0118 (280mm), the sensor value will be invalid. Since v1.1.4, all value lower than 280mm will be set to 0x0014(20mm) which means the value is invalid.
241 241  
242 242  
245 +
243 243  === 2.3.3  Interrupt Pin ===
244 244  
245 245  This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H4.2A0SetInterruptMode"]] for the hardware and software set up.
... ... @@ -810,6 +810,7 @@
810 810  * Blink once when device transmit a packet.
811 811  
812 812  
816 +
813 813  == 2.8  ​Firmware Change Log ==
814 814  
815 815  
... ... @@ -828,7 +828,7 @@
828 828  [[image:image-20220610172003-2.png]]
829 829  
830 830  
831 -== 2.10  Battery Analysis ==
835 +== 2.10  Battery Analysis  ==
832 832  
833 833  === 2.10.1  Battery Type ===
834 834  
... ... @@ -853,27 +853,80 @@
853 853  
854 854  === 2.10.2  Replace the battery ===
855 855  
856 -(((
857 857  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.
861 +
862 +
863 +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)
864 +
865 +
866 +
867 += 3.  LiDAR ToF Measurement =
868 +
869 +== 3.1 Principle of Distance Measurement ==
870 +
871 +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.
872 +
873 +[[image:1654831757579-263.png]]
874 +
875 +
876 +
877 +== 3.2 Distance Measurement Characteristics ==
878 +
879 +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:
880 +
881 +[[image:1654831774373-275.png]]
882 +
883 +
884 +(((
885 +(% style="color:blue" %)**① **(%%)Represents the detection blind zone of The LiDAR probe, 0-10cm, within which the output data is unreliable.
858 858  )))
859 859  
860 860  (((
861 -
889 +(% style="color:blue" %)**② **(%%)Represents the operating range of The LiDAR probe detecting black target with 10% reflectivity, 0.1-5m.
862 862  )))
863 863  
864 864  (((
865 -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)
893 +(% style="color:blue" %)**③ **(%%)Represents the operating range of The LiDAR probe detecting white target with 90% reflectivity, 0.1-12m.
866 866  )))
867 867  
868 868  
897 +(((
898 +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:
899 +)))
869 869  
870 -= 3.  Configure LLDS12 via AT Command or LoRaWAN Downlink =
871 871  
902 +[[image:1654831797521-720.png]]
903 +
904 +
872 872  (((
906 +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.
907 +)))
908 +
909 +[[image:1654831810009-716.png]]
910 +
911 +
873 873  (((
874 -Use can configure LDDS75 via AT Command or LoRaWAN Downlink.
913 +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.
875 875  )))
915 +
916 +
917 +
918 +== 3.3 Notice of usage: ==
919 +
920 +Possible invalid /wrong reading for LiDAR ToF tech:
921 +
922 +* Measure high reflectivity object such as: Mirror, Smooth ceramic tile, static milk surface, will have possible wrong readings.
923 +* While there is transparent object such as glass, water drop between the measured object and the LiDAR sensor, the reading might wrong.
924 +* The LiDAR probe is cover by dirty things; the reading might be wrong. In this case, need to clean the probe.
925 +* The sensor window is made by Acrylic. Don’t touch it with alcohol material. This will destroy the sensor window.
926 +
927 += 4.  Configure LLDS12 via AT Command or LoRaWAN Downlink =
928 +
929 +(((
930 +(((
931 +Use can configure LLDS12 via AT Command or LoRaWAN Downlink.
876 876  )))
933 +)))
877 877  
878 878  * (((
879 879  (((
... ... @@ -892,7 +892,7 @@
892 892  )))
893 893  
894 894  (((
895 -There are two kinds of commands to configure LDDS75, they are:
952 +There are two kinds of commands to configure LLDS12, they are:
896 896  )))
897 897  )))
898 898  
... ... @@ -933,49 +933,55 @@
933 933  
934 934  * (((
935 935  (((
936 -(% style="color:#4f81bd" %)** Commands special design for LDDS75**
993 +(% style="color:#4f81bd" %)** Commands special design for LLDS12**
937 937  )))
938 938  )))
939 939  
940 940  (((
941 941  (((
942 -These commands only valid for LDDS75, as below:
999 +These commands only valid for LLDS12, as below:
943 943  )))
944 944  )))
945 945  
946 946  
947 947  
948 -== 3.1  Access AT Commands ==
1005 +== 4.1  Set Transmit Interval Time ==
949 949  
950 -LDDS75 supports AT Command set in the stock firmware. You can use a USB to TTL adapter to connect to LDDS75 for using AT command, as below.
1007 +Feature: Change LoRaWAN End Node Transmit Interval.
951 951  
952 -[[image:image-20220610172924-4.png||height="483" width="988"]]
1009 +(% style="color:#037691" %)**AT Command: AT+TDC**
953 953  
1011 +[[image:image-20220607171554-8.png]]
954 954  
955 -Or if you have below board, use below connection:
956 956  
1014 +(((
1015 +(% style="color:#037691" %)**Downlink Command: 0x01**
1016 +)))
957 957  
958 -[[image:image-20220610172924-5.png]]
1018 +(((
1019 +Format: Command Code (0x01) followed by 3 bytes time value.
1020 +)))
959 959  
1022 +(((
1023 +If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to 0x00003C=60(S), while type code is 01.
1024 +)))
960 960  
961 -In the PC, you need to set the serial baud rate to (% style="color:green" %)**9600**(%%) to access the serial console for LDDS75. LDDS75 will output system info once power on as below:
1026 +* (((
1027 +Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
1028 +)))
1029 +* (((
1030 +Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
1031 +)))
962 962  
1033 +== 4.2  Set Interrupt Mode ==
963 963  
964 - [[image:image-20220610172924-6.png||height="601" width="860"]]
1035 +Feature, Set Interrupt mode for GPIO_EXIT.
965 965  
1037 +(% style="color:#037691" %)**AT Command: AT+INTMOD**
966 966  
1039 +[[image:image-20220610105806-2.png]]
967 967  
968 -== 3.2  Set Transmit Interval Time ==
969 969  
970 -Feature: Change LoRaWAN End Node Transmit Interval.
971 -
972 -(% style="color:#037691" %)**AT Command: AT+TDC**
973 -
974 -[[image:image-20220610173409-7.png]]
975 -
976 -
977 -
978 -
979 979  (((
980 980  (% style="color:#037691" %)**Downlink Command: 0x06**
981 981  )))
... ... @@ -995,7 +995,7 @@
995 995  Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
996 996  )))
997 997  
998 -== 3.3  Get Firmware Version Info ==
1061 +== 4.3  Get Firmware Version Info ==
999 999  
1000 1000  Feature: use downlink to get firmware version.
1001 1001  
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