Monthly Archives: December 2017

How to fill the Shopping-Shipping agent form ?

How to fill the Shopping-Shipping agent form ?

Shopping-Shipping Agent service from China 

1.Select the Shopping-Shipping agent.

click-shopping-shipping agent

click-shopping-shipping agent

2.Download the Shopping-Shipping agent form.




3. Open the downloaded Shopping-Shipping agent form.



You will see There Two Services BUY FOR ME and SHIP FOR ME.

3. There are required information for delivery. Contact name, Delivery address, Phone number,Some country or region also need the Tax ID.



4. BUY FOR ME required information.



5. SHIP FOR ME Required Information. Must requre Your supplier Name, Part name and the total quantity.



6. After you fill the required information then you send the form back to us.we will check and confirm with you for more details.

Here is our contact information:

E-mail: Gmail:

Wechat:ameisina Skype:ameisina QQ:544209846

See the procces Pls visit:

Shopping-Shipping Agent service from China 



Lora Sensor Node-LSN50 User Manual and Case Study


Dragino LoRa Sensor Node

Dragino LoRa Sensor Node

What is the LSN50

LSN50 is a Long Range LoRa Sensor Node. It is designed for outdoor use and powered by Li/SOCl2 battery for long term use power consumption and secure data transmission.It is designed to facilitate developers to quickly deploy industrial level LoRa and IoT solutions. It help users to turn the idea into a practical application and make the Internet of Things a reality. It is easy to program, create and connect your things everywhere.

It is based on SX1276/SX1278 allows the user to send data and reach extremely long ranges at low data-rates.It provides ultra-long range spread spectrum communication and high interference immunity whilst minimising current consumption.It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.

LSN50 uses STM32l0x chip from ST, STML0x is the ultra-low-power STM32L072xx microcontrollers incorporate the connectivity power of the universal serial bus (USB 2.0 crystal-less) with the high-performance ARM® Cortex®-M0+ 32-bit RISC core operating at a 32 MHz frequency, a memory protection unit (MPU), high-speed embedded memories (192 Kbytes of Flash program memory, 6 Kbytes of data EEPROM and 20 Kbytes of RAM) plus an extensive range of enhanced I/Os and peripherals.

LSN50 is an open source product, it is based on the STM32Cube HAL drivers and lots of libraries can be found in ST site for rapid development.



  • The maximum link budget is 157 dB
  • +20 dBm, 100 mW constant RF output with Vsupply
  • +14 dBm high efficiency PA
  • Programmable bit rates up to 300 k
  • High sensitivity: down to -137 dBm
  • Bulletproof front end: IIP3 = -12.5 dBm
  • 89 dB blocking immunity
  • The low RX current is 10 mA and the register is held at 200 nA
  • Fully integrated synthesizer with 61 Hz resolution
  • FSK, GFSK, MSK, GMSK, LoRa and OOK modulations
  • Bit built-in synchronizer for clock recovery
  • Synchronous word recognition
  • Preamble detection
  • 127 dB + dynamic range RSSI
  • Built-in temperature sensor and low battery indicator 1.65 V to 3.6 V power supply


MCU Side:

  • MCU: STM32L072CZT6
  • Flash:192KB
  • RAM:20KB
  • Clock Speed: 32Mhz

LoRa Side:

  • LoRa Chip: sx1276/sx1278
  • 68 dB maximum link budget.
  • +20 dBm – 100 mW constant RF output vs.
  • +14 dBm high efficiency PA.
  • Programmable bit rate up to 300 kbps.
  • High sensitivity: down to -148 dBm.
  • Bullet-proof front end: IIP3 = -12.5 dBm.
  • 127 dB Dynamic Range RSSI.
  • LoRaWAN 1.0.2 Specification

Absolute Maximum Ratings:

  • I/O pins: 0.5v ~ VCC+0.5V

Common DC Characteristics:

  • Supply Voltage: 2.1v ~ 3.6v
  • Operating Tempature: -40 ~ 85°C
  • I/O pins: Refer to STM32L072 datasheet

Power Consumption:

  • STOP Mode: 2.7uA @ 3.3v
  • LoRa Transmit Mode:

125mA @ 20dBm 44mA @ 14dBm


  • Li/SOCI2 unchargable battery
  • Capacity: 4000mAh
  • Self Discharge: <1% / Year @ 25°C
  • Max continuously current: 130mA
  • Max boost current: 2A, 1 second


  • Size:65 x 50 x 50mm
  • Net Weight: 140g


  • STM32L072CZT6 MCU
  • SX1276/78 Wireless Chip
  • Pre-load bootloader on USART1/USART2
  • MDK-ARM Version 5.24a IDE
  • 2x12bit ADC, 1x12bit DAC
  • 18xDigital I/Os
  • LoRa™ Modem
  • Preamble detection
  • Baud rate configurable
  • CN470/EU433/KR920/US915
  • EU868/AS923/AU915
  • Open source hardware / software
  • Available Band:433/868/915/920 Mhz
  • IP66 Waterproof Enclosure
  • Ultra Low Power consumption
  • AT Commands to change parameters
  • 4000mAh Battery for long term use


  • Wireless Alarm and Security Systems
  • Home and Building Automation
  • Automated Meter Reading
  • Industrial Monitoring and Control
  • Long range Irrigation Systems,etc.

Getting Start

Power On/Off the LSN50

The LSN50 is power off before shipping to avoid accident during shipping. We use a jumper to power on/off the LSN50, This will be useful for monitoring power consumption when connecting to different sensors and with different software. User can power on the device by simply adding the jumper to the board , as below.

Power on.jpg

Use the AT Command

  • AT0 1.png

  • steps
  1. NEW LSN50 1.png

  2. Connect USB 1.png

  3. Open application Seral port and click Start

  4. You can see the status of the interface(If it does not appear, press the reset button or the AT command: ATZ.)

  5. Input commands: Ex)AT+ADR=0(Adaptive rate is off).If your AT command is sent successfully, the software will receive feedback (OK).

  • Tips:If you want to know the more commands,you can send: AT+?.)

Program LSN50

  • Download Flashloader(Here is just sample application.You can also use the same type of programming application.And the method is similar.) and download source code).


  • Please follow the below of examples:

Follow the picture to find the program file.

Open this file.

Promgram4 1.png


Program5 1.png

Program6 1.png

Program7 1.png

Program8 1.png


Program9 1.png

Program10 1.png

Current consumption test in “Stop mode” mode

  • Remove the jumper from JP2, connect with a multimeter, and hit 20uA.

Pin Definition



Case Study 1: With Oil Sensor


  • The Oil Sensor is a sliding variable resistance, floating through the float above the circuit to change the size of the resistance.

Yuanlitu 1.png

Schematic 2.png

Connection steps


Connect 2.png

Connect 3.png

Calculation method

  • Only for our LSN50 such as:

(TTN) The value of the first two above is 00 00, which is 0
H = 0 * 3.0 * 1000 / (3.0 * 4095) (mm)
If (TTN) data = 00 10 is 16
H = 16 * 3.0 * 1000 / (3.0 * 4095) (mm)

Case Study 2: With DS18B20 Temperature Sensor


  • DS18B20 Temperature range is -55~125℃.

The delay time when the temperature changes is 750ms.Temperature measurement error is 0.5 ℃. The programmable resolution is 9~12 bits.


Connection steps


DS18B 1.png

Calculation method

  • The DS18B20 is configured as 12 bits at factory shipment. When reading the temperature, a total of 16 bits are read. The first 5 bits are sign bits. When the current 5 bits are 1, the read temperature is negative. When the current 5 bits are 0, Take the temperature is positive. When the temperature is positive read method: the hexadecimal number can be converted into decimal. When the temperature is negative, the reading method is: add 1 after the hexadecimal inversion, and then convert it to 10 hexadecimal. Example: 0550H = +85 degrees, FC90H = -55 degrees.

Order Infomation

Order Info- LSN50-XX-YY


  • 433: Best Tuned at 433Mhz
  • 868: Best Tuned at 868Mhz
  • 915: Best Tuned at 915/920 Mhz


  • 12: With M12 waterproof cable hole
  • 16: With M16 waterproof cable hole
  • 20: With M20 waterproof cable hole

DWM-PM-2 Mini Infrared PIR module User Guide

DWM-PM-2 Mini Infrared PIR module


Power supply is 3.3V to 15V.module include LDO;
Sensitivity can be adjust,
Delay time can be adjust,
Trigger mode is be defined as repeatable;
[small size,Wideer working voltage range,small current,stable performance]

Repeatable: if the moudul detect human body is moving,output high level at once,this moment,at delay time,if PIR detect body is moving once more, then delay time reset,be cleared to zero,start counting from zero,until the delay time to over,will output low level,waitting next trigger.

Unrepeatle:if the moudul detect human body is moving,output high level at once,this moment,signal input line be closed,PIR detect is disabled, until the delay time to over,will output low level,waitting next trigger.

 LDR worke mode

Customer can sold a LDR then the module will not work at the day time and will work at the evening.



Sensitivity adjust and Delay time adjust


delay time adjust and sentivity adjust

delay time adjust and sentivity adjust

If you want to change the sensitivity level you can folow the formula Usens=R1/(R1+R2)*VDD.if the Usens=3.3V it’s highest sensitivit and if the Usens=0.15V is Lowest sensitivity.You also have to consider the power comsumption For Lower Power comsumption the Resistance value of R1+R2 should Over 500k ohm.

if you want to change delay time take this tale as reference shows as below.

delay time adjust reference table

delay time adjust reference table

The module ouput is MCU IO port direct output,to use,advise series connection a resistance,4.7K to 10K;


1.Before use,need checking Solder iron temperature , implement leakage of electricity, and static discharge in winter(cmos component)
2.When power on,IC has 20S to 60S self-testing process,in the meantime,will output high level,then,output low level,into stable waiting state.(waiting state,it is also on standby);