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:1654831757579-263.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:1654831774373-275.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:1654831797521-720.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:1654831810009-716.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 ((( ... ... @@ -1077,6 +1077,7 @@ 1077 1077 ))) 1078 1078 1079 1079 1031 + 1080 1080 == 4.3 Get Firmware Version Info == 1081 1081 1082 1082 Feature: use downlink to get firmware version. ... ... @@ -1088,6 +1088,7 @@ 1088 1088 * Reply to the confirmation package: 26 01 1089 1089 * Reply to non-confirmed packet: 26 00 1090 1090 1043 + 1091 1091 Device will send an uplink after got this downlink command. With below payload: 1092 1092 1093 1093 Configures info payload: ... ... @@ -1109,7 +1109,7 @@ 1109 1109 Always 0x02 1110 1110 ))) 1111 1111 1112 -**Software Type**: Always 0x03 for L LDS121065 +**Software Type**: Always 0x03 for LSPH01 1113 1113 1114 1114 1115 1115 **Frequency Band**: ... ... @@ -1155,7 +1155,7 @@ 1155 1155 1156 1156 0x06: LSNPK01 1157 1157 1158 -0x07: L LDS121111 +0x07: LDDS12 1159 1159 1160 1160 1161 1161 ... ... @@ -1340,6 +1340,7 @@ 1340 1340 * (% style="color:red" %)**IN865**(%%): LoRaWAN IN865 band 1341 1341 * (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band 1342 1342 1296 + 1343 1343 = 10. Packing Info = 1344 1344 1345 1345 ... ... @@ -1354,6 +1354,7 @@ 1354 1354 * Package Size / pcs : cm 1355 1355 * Weight / pcs : g 1356 1356 1311 + 1357 1357 = 11. Support = 1358 1358 1359 1359 * Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule.
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