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1		-LSPH01 -- LoRaWAN Soil pH Sensor User Manual
	1	+LSPH01-LoRaWAN Soil pH Sensor User Manual

Author

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1		-XWiki.Bei
	1	+XWiki.Xiaoling

Content

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462	462	== 2.7 Calibration ==
463	463
464	464
465		-(% style="color:blue" %)**Step1 :**(%%)** Clean probe**
466		-
467		-user can use high grade sandpaper to polish it or put in 5% hydrochloric acid for several minutes. After the metal probe looks new, users can clean it to remove hydrochloric acid or other liquids from the surface.
468		-
469		-(% style="color:blue" %)**Step2 :**(%%)** Immerse the sensor in ph buffer solution to make the sensor values stable**
470		-
471	471	(((
472	472	User can do calibration for the probe. It is limited to use below pH buffer solution to calibrate: 4.00, 6.86, 9.18. When calibration, user need to clean the electrode and put the probe in the pH buffer solution to wait the value stable ( a new clean electrode might need max 24 hours to be stable).
473		-
474		-(% style="color:red" %)**Note: Only one ph buffer with one of the ph values needs to be calibrated during calibration. Wait for the sensor measurement value to be stable, it does not need to be the same as the ph marked by the ph buffer**
475		-
476		-
477		-(% style="color:blue" %)**Step3 :**(%%)** The numerically stable sensors were calibrated using commands**
478	478	)))
479	479
480	480	(((
481		- User can use below command to calibrate.
	470	+After stable, user can use below command to calibrate.
482	482
483	483	(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
484		-|(% style="background-color:#4f81bd; color:white; width:120px" %)**pH buffer solution**|(% style="background-color:#4f81bd; color:white; width:150px" %)**AT Command to calibrate**|(% style="background-color:#4f81bd; color:white; width:145px" %)**Downlink Command**|(% style="background-color:#4f81bd; color:white; width:95px" %)**Read Cal Value**
	473	+|(% style="background-color:#4f81bd; color:white; width:115px" %)**pH buffer solution**|(% style="background-color:#4f81bd; color:white; width:145px" %)**AT Command to calibrate**|(% style="background-color:#4f81bd; color:white; width:150px" %)**Downlink Command**|(% style="background-color:#4f81bd; color:white; width:100px" %)**Read Cal Value**
485	485	|(% style="width:149px" %)4.00|(% style="width:197px" %)AT+PHCAL=4|(% style="width:206px" %)(((
486	486	0x13 04
487	487	Reply with Calibrate payload
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506	506	)))
507	507	)))
508	508
509		-To use the AT COMMAND, refer to this link:
510	510
511		-* AT Command via Bluetooth Connection (**Recommended**): [[BLE Configure Instruction>>url:http://wiki.dragino.com/xwiki/bin/view/Main/BLE%20Bluetooth%20Remote%20Configure/]].
512		-
513		-* AT Command via UART Connection : See [[UART Connection>>url:http://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H2.3UARTConnectionforSN50v3basemotherboard]].
514		-
515		-To use Downlink, take TTN as an example, please refer to this link:
516		-
517		-* LoRaWAN Downlink.  Instruction for different platforms: See [[IoT LoRaWAN Server>>url:http://wiki.dragino.com/xwiki/bin/view/Main/]] section.
518		-
519		-When the command is successfully used, the node sends a uplink.
520		-This is the payload for uplink
521		-
522	522	(% style="color:#037691" %)**Calibration Payload**
523	523
524	524	(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:500px" %)
525	525	|=(% style="width: 60px;background-color:#4F81BD;color:white" %)(((
526	526	**Size(bytes)**
527		-)))|=(% style="width: 100px;background-color:#4F81BD;color:white" %)**1**|=(% style="width: 100px;background-color:#4F81BD;color:white" %)**1**|=(% style="width: 100px;background-color:#4F81BD;color:white" %)**1**|=(% style="width: 50px;background-color:#4F81BD;color:white" %)**7**|=(% style="width: 90px;background-color:#4F81BD;color:white" %)**1**
	504	+)))|=(% style="width: 100px;background-color:#4F81BD;color:white" %)**1**|=(% style="width: 100px;background-color:#4F81BD;color:white" %)**1**|=(% style="width: 100px;background-color:#4F81BD;color:white" %)**1**|=(% style="width: 50px;background-color:#4F81BD;color:white" %)**7**|=(% style="width:90px;background-color:#4F81BD;color:white" %)**1**
528	528	|Value|(((
529	529	PH4 Calibrate value
530	530	)))|PH6.86 Calibrate value|(((
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544	544
545	545	* Reply to non-confirmed packet: 14 00
546	546
547		-(% style="color:blue" %)**Step4 : **(%%)**After the calibration is completed, its measurement results in this ph buffer solution should be consistent with the numerical value of the command used in the calibration.**
548		-
549		-Examples:
550		-After using the command AT+PH=9 in 9.18ph buffer
551		-The readout returned by the sensor in 9.18ph buffer should be pH=9
552		-
553		-
554	554	== 2.8 Frequency Plans ==
555	555
556	556

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