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Title

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

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	+
465	465	(((
466	466	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**
467	467	)))
468	468
469	469	(((
470		-After stable, user can use below command to calibrate.
	481	+ User can use below command to calibrate.
471	471
472	472	(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
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**
	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**
474	474	|(% style="width:149px" %)4.00|(% style="width:197px" %)AT+PHCAL=4|(% style="width:206px" %)(((
475	475	0x13 04
476	476	Reply with Calibrate payload
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495	495	)))
496	496	)))
497	497
	509	+To use the AT COMMAND, refer to this link:
498	498
	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	+
499	499	(% style="color:#037691" %)**Calibration Payload**
500	500
501	501	(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:500px" %)
502	502	|=(% style="width: 60px;background-color:#4F81BD;color:white" %)(((
503	503	**Size(bytes)**
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**
	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**
505	505	|Value|(((
506	506	PH4 Calibrate value
507	507	)))|PH6.86 Calibrate value|(((
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521	521
522	522	* Reply to non-confirmed packet: 14 00
523	523
	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	+
524	524	== 2.8 Frequency Plans ==
525	525
526	526