Changes for page LDDS45 - LoRaWAN Distance Detection Sensor User Manual
Last modified by Mengting Qiu on 2025/02/26 15:04
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... ... @@ -912,56 +912,7 @@ 912 912 **Firmware Upgrade Method: **[[Firmware Upgrade Instruction>>path:/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/]] 913 913 914 914 915 -= 3. LiDAR ToF Measurement = 916 916 917 -== 3.1 Principle of Distance Measurement == 918 - 919 -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. 920 - 921 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image001.png]] 922 - 923 - 924 - 925 -== 3.2 Distance Measurement Characteristics == 926 - 927 -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: 928 - 929 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png]] 930 - 931 - 932 -①Represents the detection blind zone of The LiDAR probe, 0-10cm, within which the output data is unreliable. 933 - 934 -②Represents the operating range of The LiDAR probe detecting black target with 10% reflectivity, 0.1-5m. 935 - 936 -③Represents the operating range of The LiDAR probe detecting white target with 90% reflectivity, 0.1-12m. 937 - 938 - 939 -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: 940 - 941 - 942 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image003.png]] 943 - 944 - 945 -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. 946 - 947 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image004.png]] 948 - 949 - 950 -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. 951 - 952 - 953 - 954 -== 3.3 Notice of usage: == 955 - 956 -Possible invalid /wrong reading for LiDAR ToF tech: 957 - 958 -* Measure high reflectivity object such as: Mirror, Smooth ceramic tile, static milk surface, will have possible wrong readings. 959 -* While there is transparent object such as glass, water drop between the measured object and the LiDAR sensor, the reading might wrong. 960 -* The LiDAR probe is cover by dirty things; the reading might be wrong. In this case, need to clean the probe. 961 -* The sensor window is made by Acrylic. Don’t touch it with alcohol material. This will destroy the sensor window. 962 - 963 - 964 - 965 965 = 4. Configure LLDS12 via AT Command or LoRaWAN Downlink = 966 966 967 967 ((( ... ... @@ -978,7 +978,7 @@ 978 978 ((( 979 979 980 980 981 -There are two kinds of commands to configure L LDS12, they are:932 +There are two kinds of commands to configure LSPH01, they are: 982 982 ))) 983 983 984 984 * ((( ... ... @@ -1009,12 +1009,12 @@ 1009 1009 ))) 1010 1010 1011 1011 ((( 1012 -These commands only valid for L LDS12, as below:963 +These commands only valid for LSPH01, as below: 1013 1013 ))) 1014 1014 1015 1015 1016 1016 1017 -== 4.1968 +== 3.1 Set Transmit Interval Time == 1018 1018 1019 1019 Feature: Change LoRaWAN End Node Transmit Interval. 1020 1020 ... ... @@ -1046,17 +1046,15 @@ 1046 1046 1047 1047 ))) 1048 1048 1049 -== 4.21000 +== 3.2 Set Interrupt Mode == 1050 1050 1051 1051 Feature, Set Interrupt mode for GPIO_EXIT. 1052 1052 1053 1053 (% style="color:#037691" %)**AT Command: AT+INTMOD** 1054 1054 1055 -[[image:image-202206 10105806-2.png]]1006 +[[image:image-20220607171716-9.png]] 1056 1056 1057 1057 1058 - 1059 - 1060 1060 ((( 1061 1061 (% style="color:#037691" %)**Downlink Command: 0x06** 1062 1062 ))) ... ... @@ -1076,10 +1076,20 @@ 1076 1076 Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger 1077 1077 ))) 1078 1078 1028 +((( 1029 + 1030 +))) 1079 1079 1080 1080 1081 -== 4.3 Get Firmware Version Info == 1082 1082 1034 +== 3.3 Calibrate Sensor == 1035 + 1036 +Detail See [[Calibration Guide>>||anchor="H2.7Calibration"]] for the user of 0x13 and 0x14 downlink commands 1037 + 1038 + 1039 + 1040 +== 3.4 Get Firmware Version Info == 1041 + 1083 1083 Feature: use downlink to get firmware version. 1084 1084 1085 1085 (% style="color:#037691" %)**Downlink Command: 0x26** ... ... @@ -1089,7 +1089,6 @@ 1089 1089 * Reply to the confirmation package: 26 01 1090 1090 * Reply to non-confirmed packet: 26 00 1091 1091 1092 - 1093 1093 Device will send an uplink after got this downlink command. With below payload: 1094 1094 1095 1095 Configures info payload: ... ... @@ -1111,7 +1111,7 @@ 1111 1111 Always 0x02 1112 1112 ))) 1113 1113 1114 -**Software Type**: Always 0x03 for L LDS121072 +**Software Type**: Always 0x03 for LSPH01 1115 1115 1116 1116 1117 1117 **Frequency Band**: ... ... @@ -1157,7 +1157,7 @@ 1157 1157 1158 1158 0x06: LSNPK01 1159 1159 1160 -0x07: L LDS121118 +0x07: LDDS12 1161 1161 1162 1162 1163 1163
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