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Last modified by Mengting Qiu on 2025/08/06 17:02
From version 174.6
edited by Xiaoling
on 2022/06/15 10:33
Change comment: There is no comment for this version
To version 172.6
edited by Xiaoling
on 2022/06/15 09:58
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -100,6 +100,8 @@
100 100  * IP66 Waterproof Enclosure
101 101  * 8500mAh Battery for long term use
102 102  
103 +
104 +
103 103  == 1.3  Suitable Container & Liquid ==
104 104  
105 105  * Solid Wall container such as: steel, iron, glass, ceramics, non-foaming plastics etc.
... ... @@ -109,6 +109,8 @@
109 109  ** Pure non metal material: <10 mm
110 110  * Pure liquid without irregular deposition.
111 111  
114 +
115 +
112 112  == 1.4  Mechanical ==
113 113  
114 114  [[image:image-20220615090910-1.png]]
... ... @@ -198,6 +198,9 @@
198 198  * Smart liquid control solution.
199 199  * Smart liquefied gas solution.
200 200  
205 +
206 +
207 +
201 201  == 1.7  Precautions ==
202 202  
203 203  * At room temperature, containers of different materials, such as steel, glass, iron, ceramics, non-foamed plastics and other dense materials, have different detection blind areas and detection limit heights.
... ... @@ -204,6 +204,9 @@
204 204  * For containers of the same material at room temperature, the detection blind zone and detection limit height are also different for the thickness of the container.
205 205  * When the detected liquid level exceeds the effective detection value of the sensor, and the liquid level of the liquid to be measured shakes or tilts, the detected liquid height is unstable.
206 206  
214 +
215 +
216 +
207 207  == 1.8  Pin mapping and power on ==
208 208  
209 209  
... ... @@ -217,7 +217,7 @@
217 217  == 2.1  How it works ==
218 218  
219 219  (((
220 -The LDDS20 is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join LoRaWAN network. To connect a LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and power on the LDDS20. If there is coverage of the LoRaWAN network, it will automatically join the network via OTAA and start to send the sensor value.
230 +The LDDS20 is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join LoRaWAN network. To connect a LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and power on the LDDS75. If there is coverage of the LoRaWAN network, it will automatically join the network via OTAA and start to send the sensor value.
221 221  )))
222 222  
223 223  (((
... ... @@ -311,7 +311,7 @@
311 311  
312 312  (((
313 313  (((
314 -LDDS20 will uplink payload via LoRaWAN with below payload format: 
324 +LDDS20 will uplink payload via LoRaWAN with below payload format:
315 315  
316 316  Uplink payload includes in total 8 bytes.
317 317  Payload for firmware version v1.1.4. . Before v1.1.3, there is only 5 bytes: BAT and Distance(Please check manual v1.2.0 if you have 5 bytes payload).
... ... @@ -359,14 +359,16 @@
359 359  For example, if the data you get from the register is __0x06 0x05__, the distance between the sensor and the measured object is(% style="color:#4472c4" %)** 0605(H) = 1541 (D) = 1541 mm.**
360 360  )))
361 361  
362 -* If the sensor value is 0x0000, it means system doesn't detect ultrasonic sensor.
363 -* If the sensor value lower than 0x0014 (20mm), the sensor value will be invalid.
364 364  
373 +* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
374 +* 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.
365 365  
366 366  
377 +
378 +
367 367  === 2.3.3  Interrupt Pin ===
368 368  
369 -This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H3.2A0SetInterruptMode"]] for the hardware and software set up.
381 +This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H3.3A0SetInterruptMode"]] for the hardware and software set up.
370 370  
371 371  **Example:**
372 372  
... ... @@ -412,96 +412,538 @@
412 412  The payload decoder function for TTN V3 is here:
413 413  
414 414  (((
415 -LDDS20 TTN V3 Payload Decoder: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDDS20/Payload_Decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Payload_Decoder/]]
427 +LDDS75 TTN V3 Payload Decoder: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDDS75/Payload_Decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Payload_Decoder/]]
416 416  )))
417 417  
418 418  
419 419  
420 -== 2.4  Downlink Payload ==
432 +== 2.4  Uplink Interval ==
421 421  
422 -By default, LDDS20 prints the downlink payload to console port.
434 +The LDDS75 by default uplink the sensor data every 20 minutes. User can change this interval by AT Command or LoRaWAN Downlink Command. See this link: [[Change Uplink Interval>>doc:Main.End Device AT Commands and Downlink Command.WebHome||anchor="H4.1ChangeUplinkInterval"]]
423 423  
424 -[[image:image-20220615100930-15.png]]
425 425  
426 426  
427 -**Examples:**
438 +== 2.5  ​Show Data in DataCake IoT Server ==
428 428  
440 +(((
441 +[[DATACAKE>>url:https://datacake.co/]] provides a human friendly interface to show the sensor data, once we have data in TTN, we can use [[DATACAKE>>url:https://datacake.co/]] to connect to TTN and see the data in DATACAKE. Below are the steps:
442 +)))
429 429  
430 -* (% style="color:blue" %)**Set TDC**
444 +(((
445 +
446 +)))
431 431  
432 -If the payload=0100003C, it means set the END Node's TDC to 0x00003C=60(S), while type code is 01.
448 +(((
449 +(% style="color:blue" %)**Step 1**(%%)**: Be sure that your device is programmed and properly connected to the network at this time.**
450 +)))
433 433  
434 -Payload:    01 00 00 1E    TDC=30S
452 +(((
453 +(% style="color:blue" %)**Step 2**(%%)**: To configure the Application to forward data to DATACAKE you will need to add integration. To add the DATACAKE integration, perform the following steps:**
454 +)))
435 435  
436 -Payload:    01 00 00 3C    TDC=60S
437 437  
457 +[[image:1654592790040-760.png]]
438 438  
439 -* (% style="color:blue" %)**Reset**
440 440  
441 -If payload = 0x04FF, it will reset the LDDS20
460 +[[image:1654592800389-571.png]]
442 442  
443 443  
444 -* (% style="color:blue" %)**CFM**
463 +(% style="color:blue" %)**Step 3**(%%)**: Create an account or log in Datacake.**
445 445  
446 -Downlink Payload: 05000001, Set AT+CFM=1 or 05000000 , set AT+CFM=0
465 +(% style="color:blue" %)**Step 4**(%%)**: Search the LDDS75 and add DevEUI.**
447 447  
467 +[[image:1654851029373-510.png]]
448 448  
449 449  
450 -== 2.5  ​Show Data in DataCake IoT Server ==
470 +After added, the sensor data arrive TTN V3, it will also arrive and show in Datacake.
451 451  
472 +[[image:image-20220610165129-11.png||height="595" width="1088"]]
473 +
474 +
475 +
476 +== 2.6  Frequency Plans ==
477 +
452 452  (((
453 -[[DATACAKE>>url:https://datacake.co/]] provides a human friendly interface to show the sensor data, once we have data in TTN, we can use [[DATACAKE>>url:https://datacake.co/]] to connect to TTN and see the data in DATACAKE. Below are the steps:
479 +The LDDS75 uses OTAA mode and below frequency plans by default. If user want to use it with different frequency plan, please refer the AT command sets.
454 454  )))
455 455  
482 +
483 +
484 +=== 2.6.1  EU863-870 (EU868) ===
485 +
456 456  (((
487 +(% style="color:blue" %)**Uplink:**
488 +)))
489 +
490 +(((
491 +868.1 - SF7BW125 to SF12BW125
492 +)))
493 +
494 +(((
495 +868.3 - SF7BW125 to SF12BW125 and SF7BW250
496 +)))
497 +
498 +(((
499 +868.5 - SF7BW125 to SF12BW125
500 +)))
501 +
502 +(((
503 +867.1 - SF7BW125 to SF12BW125
504 +)))
505 +
506 +(((
507 +867.3 - SF7BW125 to SF12BW125
508 +)))
509 +
510 +(((
511 +867.5 - SF7BW125 to SF12BW125
512 +)))
513 +
514 +(((
515 +867.7 - SF7BW125 to SF12BW125
516 +)))
517 +
518 +(((
519 +867.9 - SF7BW125 to SF12BW125
520 +)))
521 +
522 +(((
523 +868.8 - FSK
524 +)))
525 +
526 +(((
457 457  
458 458  )))
459 459  
460 460  (((
461 -(% style="color:blue" %)**Step 1**(%%)**: Be sure that your device is programmed and properly connected to the network at this time.**
531 +(% style="color:blue" %)**Downlink:**
462 462  )))
463 463  
464 464  (((
465 -(% style="color:blue" %)**Step 2**(%%)**: To configure the Application to forward data to DATACAKE you will need to add integration. To add the DATACAKE integration, perform the following steps:**
535 +Uplink channels 1-9 (RX1)
466 466  )))
467 467  
538 +(((
539 +869.525 - SF9BW125 (RX2 downlink only)
540 +)))
468 468  
469 -[[image:1654592790040-760.png]]
470 470  
471 471  
472 -[[image:1654592800389-571.png]]
544 +=== 2.6.2  US902-928(US915) ===
473 473  
546 +(((
547 +Used in USA, Canada and South America. Default use CHE=2
474 474  
475 -(% style="color:blue" %)**Step 3**(%%)**: Create an account or log in Datacake.**
549 +(% style="color:blue" %)**Uplink:**
476 476  
477 -(% style="color:blue" %)**Step 4**(%%)**: Search the LDDS75 and add DevEUI.(% style="color:red" %)(Note: LDDS20 use same payload as LDDS75)(%%)**
551 +903.9 - SF7BW125 to SF10BW125
478 478  
479 -[[image:1654851029373-510.png]]
553 +904.1 - SF7BW125 to SF10BW125
480 480  
555 +904.3 - SF7BW125 to SF10BW125
481 481  
482 -After added, the sensor data arrive TTN V3, it will also arrive and show in Datacake.
557 +904.5 - SF7BW125 to SF10BW125
483 483  
484 -[[image:image-20220610165129-11.png||height="595" width="1088"]]
559 +904.7 - SF7BW125 to SF10BW125
485 485  
561 +904.9 - SF7BW125 to SF10BW125
486 486  
563 +905.1 - SF7BW125 to SF10BW125
487 487  
488 -== 2.6  LED Indicator ==
565 +905.3 - SF7BW125 to SF10BW125
489 489  
490 -The LDDS20 has an internal LED which is to show the status of different state.
491 491  
568 +(% style="color:blue" %)**Downlink:**
492 492  
570 +923.3 - SF7BW500 to SF12BW500
571 +
572 +923.9 - SF7BW500 to SF12BW500
573 +
574 +924.5 - SF7BW500 to SF12BW500
575 +
576 +925.1 - SF7BW500 to SF12BW500
577 +
578 +925.7 - SF7BW500 to SF12BW500
579 +
580 +926.3 - SF7BW500 to SF12BW500
581 +
582 +926.9 - SF7BW500 to SF12BW500
583 +
584 +927.5 - SF7BW500 to SF12BW500
585 +
586 +923.3 - SF12BW500(RX2 downlink only)
587 +
588 +
589 +
590 +)))
591 +
592 +=== 2.6.3  CN470-510 (CN470) ===
593 +
594 +(((
595 +Used in China, Default use CHE=1
596 +)))
597 +
598 +(((
599 +(% style="color:blue" %)**Uplink:**
600 +)))
601 +
602 +(((
603 +486.3 - SF7BW125 to SF12BW125
604 +)))
605 +
606 +(((
607 +486.5 - SF7BW125 to SF12BW125
608 +)))
609 +
610 +(((
611 +486.7 - SF7BW125 to SF12BW125
612 +)))
613 +
614 +(((
615 +486.9 - SF7BW125 to SF12BW125
616 +)))
617 +
618 +(((
619 +487.1 - SF7BW125 to SF12BW125
620 +)))
621 +
622 +(((
623 +487.3 - SF7BW125 to SF12BW125
624 +)))
625 +
626 +(((
627 +487.5 - SF7BW125 to SF12BW125
628 +)))
629 +
630 +(((
631 +487.7 - SF7BW125 to SF12BW125
632 +)))
633 +
634 +(((
635 +
636 +)))
637 +
638 +(((
639 +(% style="color:blue" %)**Downlink:**
640 +)))
641 +
642 +(((
643 +506.7 - SF7BW125 to SF12BW125
644 +)))
645 +
646 +(((
647 +506.9 - SF7BW125 to SF12BW125
648 +)))
649 +
650 +(((
651 +507.1 - SF7BW125 to SF12BW125
652 +)))
653 +
654 +(((
655 +507.3 - SF7BW125 to SF12BW125
656 +)))
657 +
658 +(((
659 +507.5 - SF7BW125 to SF12BW125
660 +)))
661 +
662 +(((
663 +507.7 - SF7BW125 to SF12BW125
664 +)))
665 +
666 +(((
667 +507.9 - SF7BW125 to SF12BW125
668 +)))
669 +
670 +(((
671 +508.1 - SF7BW125 to SF12BW125
672 +)))
673 +
674 +(((
675 +505.3 - SF12BW125 (RX2 downlink only)
676 +)))
677 +
678 +
679 +
680 +=== 2.6.4  AU915-928(AU915) ===
681 +
682 +(((
683 +Default use CHE=2
684 +
685 +(% style="color:blue" %)**Uplink:**
686 +
687 +916.8 - SF7BW125 to SF12BW125
688 +
689 +917.0 - SF7BW125 to SF12BW125
690 +
691 +917.2 - SF7BW125 to SF12BW125
692 +
693 +917.4 - SF7BW125 to SF12BW125
694 +
695 +917.6 - SF7BW125 to SF12BW125
696 +
697 +917.8 - SF7BW125 to SF12BW125
698 +
699 +918.0 - SF7BW125 to SF12BW125
700 +
701 +918.2 - SF7BW125 to SF12BW125
702 +
703 +
704 +(% style="color:blue" %)**Downlink:**
705 +
706 +923.3 - SF7BW500 to SF12BW500
707 +
708 +923.9 - SF7BW500 to SF12BW500
709 +
710 +924.5 - SF7BW500 to SF12BW500
711 +
712 +925.1 - SF7BW500 to SF12BW500
713 +
714 +925.7 - SF7BW500 to SF12BW500
715 +
716 +926.3 - SF7BW500 to SF12BW500
717 +
718 +926.9 - SF7BW500 to SF12BW500
719 +
720 +927.5 - SF7BW500 to SF12BW500
721 +
722 +923.3 - SF12BW500(RX2 downlink only)
723 +
724 +
725 +
726 +)))
727 +
728 +=== 2.6.5  AS920-923 & AS923-925 (AS923) ===
729 +
730 +(((
731 +(% style="color:blue" %)**Default Uplink channel:**
732 +)))
733 +
734 +(((
735 +923.2 - SF7BW125 to SF10BW125
736 +)))
737 +
738 +(((
739 +923.4 - SF7BW125 to SF10BW125
740 +)))
741 +
742 +(((
743 +
744 +)))
745 +
746 +(((
747 +(% style="color:blue" %)**Additional Uplink Channel**:
748 +)))
749 +
750 +(((
751 +(OTAA mode, channel added by JoinAccept message)
752 +)))
753 +
754 +(((
755 +
756 +)))
757 +
758 +(((
759 +(% style="color:blue" %)**AS920~~AS923 for Japan, Malaysia, Singapore**:
760 +)))
761 +
762 +(((
763 +922.2 - SF7BW125 to SF10BW125
764 +)))
765 +
766 +(((
767 +922.4 - SF7BW125 to SF10BW125
768 +)))
769 +
770 +(((
771 +922.6 - SF7BW125 to SF10BW125
772 +)))
773 +
774 +(((
775 +922.8 - SF7BW125 to SF10BW125
776 +)))
777 +
778 +(((
779 +923.0 - SF7BW125 to SF10BW125
780 +)))
781 +
782 +(((
783 +922.0 - SF7BW125 to SF10BW125
784 +)))
785 +
786 +(((
787 +
788 +)))
789 +
790 +(((
791 +(% style="color:blue" %)**AS923 ~~ AS925 for Brunei, Cambodia, Hong Kong, Indonesia, Laos, Taiwan, Thailand, Vietnam**:
792 +)))
793 +
794 +(((
795 +923.6 - SF7BW125 to SF10BW125
796 +)))
797 +
798 +(((
799 +923.8 - SF7BW125 to SF10BW125
800 +)))
801 +
802 +(((
803 +924.0 - SF7BW125 to SF10BW125
804 +)))
805 +
806 +(((
807 +924.2 - SF7BW125 to SF10BW125
808 +)))
809 +
810 +(((
811 +924.4 - SF7BW125 to SF10BW125
812 +)))
813 +
814 +(((
815 +924.6 - SF7BW125 to SF10BW125
816 +)))
817 +
818 +(((
819 +
820 +)))
821 +
822 +(((
823 +(% style="color:blue" %)**Downlink:**
824 +)))
825 +
826 +(((
827 +Uplink channels 1-8 (RX1)
828 +)))
829 +
830 +(((
831 +923.2 - SF10BW125 (RX2)
832 +)))
833 +
834 +
835 +
836 +=== 2.6.6  KR920-923 (KR920) ===
837 +
838 +(((
839 +(% style="color:blue" %)**Default channel:**
840 +)))
841 +
842 +(((
843 +922.1 - SF7BW125 to SF12BW125
844 +)))
845 +
846 +(((
847 +922.3 - SF7BW125 to SF12BW125
848 +)))
849 +
850 +(((
851 +922.5 - SF7BW125 to SF12BW125
852 +)))
853 +
854 +(((
855 +
856 +)))
857 +
858 +(((
859 +(% style="color:blue" %)**Uplink: (OTAA mode, channel added by JoinAccept message)**
860 +)))
861 +
862 +(((
863 +922.1 - SF7BW125 to SF12BW125
864 +)))
865 +
866 +(((
867 +922.3 - SF7BW125 to SF12BW125
868 +)))
869 +
870 +(((
871 +922.5 - SF7BW125 to SF12BW125
872 +)))
873 +
874 +(((
875 +922.7 - SF7BW125 to SF12BW125
876 +)))
877 +
878 +(((
879 +922.9 - SF7BW125 to SF12BW125
880 +)))
881 +
882 +(((
883 +923.1 - SF7BW125 to SF12BW125
884 +)))
885 +
886 +(((
887 +923.3 - SF7BW125 to SF12BW125
888 +)))
889 +
890 +(((
891 +
892 +)))
893 +
894 +(((
895 +(% style="color:blue" %)**Downlink:**
896 +)))
897 +
898 +(((
899 +Uplink channels 1-7(RX1)
900 +)))
901 +
902 +(((
903 +921.9 - SF12BW125 (RX2 downlink only; SF12BW125 might be changed to SF9BW125)
904 +)))
905 +
906 +
907 +
908 +=== 2.6.7  IN865-867 (IN865) ===
909 +
910 +(((
911 +(% style="color:blue" %)**Uplink:**
912 +)))
913 +
914 +(((
915 +865.0625 - SF7BW125 to SF12BW125
916 +)))
917 +
918 +(((
919 +865.4025 - SF7BW125 to SF12BW125
920 +)))
921 +
922 +(((
923 +865.9850 - SF7BW125 to SF12BW125
924 +)))
925 +
926 +(((
927 +
928 +)))
929 +
930 +(((
931 +(% style="color:blue" %)**Downlink:**
932 +)))
933 +
934 +(((
935 +Uplink channels 1-3 (RX1)
936 +)))
937 +
938 +(((
939 +866.550 - SF10BW125 (RX2)
940 +)))
941 +
942 +
943 +
944 +== 2.7  LED Indicator ==
945 +
946 +The LDDS75 has an internal LED which is to show the status of different state.
947 +
948 +
493 493  * Blink once when device power on.
494 494  * The device detects the sensor and flashes 5 times.
495 495  * Solid ON for 5 seconds once device successful Join the network.
496 496  * Blink once when device transmit a packet.
497 497  
954 +== 2.8  ​Firmware Change Log ==
498 498  
499 499  
500 -== 2.7  ​Firmware Change Log ==
501 -
502 -
503 503  (((
504 -**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/]]
958 +**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/]]
505 505  )))
506 506  
507 507  (((
... ... @@ -509,45 +509,46 @@
509 509  )))
510 510  
511 511  (((
512 -**Firmware Upgrade Method:  [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]**
966 +**Firmware Upgrade Method: **[[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
513 513  )))
514 514  
515 515  
516 516  
517 -== 2.8  Battery Analysis ==
971 +== 2.9  Mechanical ==
518 518  
519 519  
974 +[[image:image-20220610172003-1.png]]
520 520  
521 521  
522 -=== 2.8.1  Battery Type ===
977 +[[image:image-20220610172003-2.png]]
523 523  
524 -The LDDS20 battery is a combination of a 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.
525 525  
526 526  
981 +== 2.10  Battery Analysis ==
982 +
983 +=== 2.10.1  Battery Type ===
984 +
985 +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.
986 +
987 +
527 527  The battery related documents as below:
528 528  
529 529  * (((
530 -[[Battery Dimension>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]],
991 +[[Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],
531 531  )))
532 532  * (((
533 -[[Lithium-Thionyl Chloride Battery  datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]],
994 +[[Lithium-Thionyl Chloride Battery  datasheet>>url:https://www.dragino.com/downloads/downloads/datasheet/Battery/ER26500/ER26500_Datasheet-EN.pdf]],
534 534  )))
535 535  * (((
536 -[[Lithium-ion Battery-Capacitor datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]
997 +[[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]]
537 537  )))
538 538  
539 - [[image:image-20220615102527-16.png]]
1000 + [[image:image-20220610172400-3.png]]
540 540  
541 541  
542 542  
543 -== 2.8.2  Battery Note ==
1004 +=== 2.10.2  Replace the battery ===
544 544  
545 -The Li-SICO battery is designed for small current / long period application. It is not good to use a high current, short period transmit method. The recommended minimum period for use of this battery is 5 minutes. If you use a shorter period time to uplink data, then the battery life may be decreased.
546 -
547 -
548 -
549 -=== 2.8.3  Replace the battery ===
550 -
551 551  (((
552 552  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.
553 553  )))
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