Last modified by Bei Jinggeng on 2025/01/10 15:51
<
From version < 64.1 >
edited by Saxer Lin
on 2023/08/17 17:38
To version < 74.5 >
edited by Xiaoling
on 2023/08/19 16:07
>
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1 -XWiki.Saxer
1 +XWiki.Xiaoling
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585 585  When AA is 2, set the count of PA4 pin to BB Corresponding downlink：09 02 bb bb bb bb
586 586  
587 587  
588 +==== 2.3.2.10  MOD~=10 (PWM input capture and output mode，Since firmware v1.2) ====
589 +
590 +
591 +In this mode, the uplink can perform PWM input capture, and the downlink can perform PWM output.
592 +
593 +[[It should be noted when using PWM mode.>>||anchor="H2.3.3.12A0PWMMOD"]]
594 +
595 +
596 +===== 2.3.2.10.a  Uplink, PWM input capture =====
597 +
598 +
599 +[[image:image-20230817172209-2.png||height="439" width="683"]]
600 +
601 +(% border="1" cellspacing="4" style="background-color:#f2f2f2; width:690px" %)
602 +|(% style="background-color:#d9e2f3; color:#0070c0; width:50px" %)**Size(bytes)**|(% style="background-color:#d9e2f3; color:#0070c0; width:20px" %)**2**|(% style="background-color:#d9e2f3; color:#0070c0; width:100px" %)**2**|(% style="background-color:#d9e2f3; color:#0070c0; width:50px" %)**2**|(% style="background-color:#d9e2f3; color:#0070c0; width:135px" %)**1**|(% style="background-color:#d9e2f3; color:#0070c0; width:70px" %)**2**|(% style="background-color:#d9e2f3; color:#0070c0; width:89px" %)**2**
603 +|Value|Bat|(% style="width:191px" %)(((
604 +Temperature(DS18B20)(PC13)
605 +)))|(% style="width:78px" %)(((
606 +ADC(PA4)
607 +)))|(% style="width:135px" %)(((
608 +PWM_Setting
609 +
610 +&Digital Interrupt(PA8)
611 +)))|(% style="width:70px" %)(((
612 +Pulse period
613 +)))|(% style="width:89px" %)(((
614 +Duration of high level
615 +)))
616 +
617 +[[image:image-20230817170702-1.png||height="161" width="1044"]]
618 +
619 +
620 +When the device detects the following PWM signal ,decoder will converts the pulse period and high-level duration to frequency and duty cycle.
621 +
622 +**Frequency：**
623 +
624 +(% class="MsoNormal" %)
625 +(% lang="EN-US" %)If (% style="background-attachment:initial; background-clip:initial; background-image:initial; background-origin:initial; background-position:initial; background-repeat:initial; background-size:initial; color:blue; font-family:Arial,sans-serif" %)**AT+PWMSET**(%%)**=0, **(% lang="EN-US" %)Frequency= 1000000/(%%)Pulse period（HZ）;
626 +
627 +(% class="MsoNormal" %)
628 +(% lang="EN-US" %)If (% style="background-attachment:initial; background-clip:initial; background-image:initial; background-origin:initial; background-position:initial; background-repeat:initial; background-size:initial; color:blue; font-family:Arial,sans-serif" %)**AT+PWMSET**(%%)**=1, **(% lang="EN-US" %)Frequency= 1000/(%%)Pulse period（HZ）;
629 +
630 +
631 +(% class="MsoNormal" %)
632 +**Duty cycle:**
633 +
634 +Duty cycle= Duration of high level/ Pulse period*100 ~(%).
635 +
636 +[[image:image-20230818092200-1.png||height="344" width="627"]]
637 +
638 +
639 +===== 2.3.2.10.b  Downlink, PWM output =====
640 +
641 +
642 +[[image:image-20230817173800-3.png||height="412" width="685"]]
643 +
644 +Downlink:  (% style="color:#037691" %)**0B xx xx xx yy zz zz**
645 +
646 + xx xx xx is the output frequency, the unit is HZ.
647 +
648 + yy is the duty cycle of the output, the unit is %.
649 +
650 + zz zz is the time delay of the output, the unit is ms.
651 +
652 +
653 +For example, send a downlink command: 0B 00 61 A8 32 13 88, the frequency is 25KHZ, the duty cycle is 50, and the output time is 5 seconds.
654 +
655 +The oscilloscope displays as follows:
656 +
657 +[[image:image-20230817173858-5.png||height="694" width="921"]]
658 +
659 +
588 588  === 2.3.3  ​Decode payload ===
589 589  
590 590  
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808 808  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LSN50%20%26%20LSN50-V2%20-%20LoRaWAN%20Sensor%20Node%20User%20Manual/WebHome/image-20220628110012-12.png?rev=1.1||alt="image-20220628110012-12.png" height="361" width="953"]]
809 809  
810 810  
811 -==== 2.3.3.12  Working MOD ====
883 +==== 2.3.3.12  PWM MOD ====
812 812  
813 813  
886 +* (((
887 +The maximum voltage that the SDA pin of SN50v3 can withstand is 3.6V, and it cannot exceed this voltage value, otherwise the chip may be burned.
888 +)))
889 +* (((
890 +If the PWM pin connected to the SDA pin cannot maintain a high level when it is not working, you need to remove the resistor R2 or replace it with a resistor with a larger resistance, otherwise a sleep current of about 360uA will be generated. The position of the resistor is shown in the figure below:
891 +)))
892 +
893 + [[image:image-20230817183249-3.png||height="320" width="417"]]
894 +
895 +* (((
896 +The signal captured by the input should preferably be processed by hardware filtering and then connected in. The software processing method is to capture four values, discard the first captured value, and then take the middle value of the second, third, and fourth captured values.
897 +)))
898 +* (((
899 +Since the device can only detect a pulse period of 50ms when [[AT+PWMSET=0>>||anchor="H3.3.8PWMsetting"]] (counting in microseconds), it is necessary to change the value of PWMSET according to the frequency of input capture.
900 +
901 +
902 +
903 +)))
904 +
905 +==== 2.3.3.13  Working MOD ====
906 +
907 +
814 814  The working MOD info is contained in the Digital in & Digital Interrupt byte (7^^th^^ Byte).
815 815  
816 816  User can use the 3^^rd^^ ~~ 7^^th^^  bit of this byte to see the working mod:
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826 826  * 6: MOD7
827 827  * 7: MOD8
828 828  * 8: MOD9
923 +* 9: MOD10
829 829  
830 830  
831 831  
... ... @@ -1071,6 +1071,35 @@
1071 1071  
1072 1072  
1073 1073  
1169 +=== 3.3.8 PWM setting ===
1170 +
1171 +
1172 +Feature: Set the time acquisition unit for PWM input capture.
1173 +
1174 +(% style="color:blue" %)**AT Command: AT+PWMSET**
1175 +
1176 +(% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %)
1177 +|=(% style="width: 155px;background-color:#D9E2F3;color:#0070C0" %)**Command Example**|=(% style="width: 197px;background-color:#D9E2F3;color:#0070C0" %)**Function**|=(% style="width: 158px;background-color:#D9E2F3;color:#0070C0" %)**Response**
1178 +|(% style="width:154px" %)AT+PWMSET=?|(% style="width:196px" %)0|(% style="width:157px" %)(((
1179 +0(default)
1180 +
1181 +OK
1182 +)))
1183 +|(% style="width:154px" %)AT+PWMSET=0|(% style="width:196px" %)The unit of PWM capture time is microsecond. The capture frequency range is between 20HZ and 100000HZ.   |(% style="width:157px" %)(((
1184 +OK
1185 +
1186 +)))
1187 +|(% style="width:154px" %)AT+PWMSET=1|(% style="width:196px" %)The unit of PWM capture time is millisecond.  The capture frequency range is between 5HZ and 250HZ. |(% style="width:157px" %)OK
1188 +
1189 +(% style="color:blue" %)**Downlink Command: 0x0C**
1190 +
1191 +Format: Command Code (0x0C) followed by 1 bytes.
1192 +
1193 +* Example 1: Downlink Payload: 0C00  **~-~-->**  AT+PWMSET=0
1194 +* Example 2: Downlink Payload: 0C01  **~-~-->**  AT+PWMSET=1
1195 +
1196 +
1197 +
1074 1074  = 4. Battery & Power Consumption =
1075 1075  
1076 1076  
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