add fake LoRa

materials/architecture/LoRa_plan.md

@@ -10,21 +10,60 @@
 ## Devices
  - VPS x1
  - Gateway(Raspberry Pi / NodeMCU) x1
- - LoRa Module x5
+ - ..LoRa Module x3
+
+## Features
+ - Cost: around ￥600 except Sensors and Raspberry Pi
+ - Ground Sensor Nodes Low Power
+ - Air Sensor Node Low Power
+ - Simple Network Topology
+ - Provide HTTP and WebSocket API, Easy to support a Website/App Demo Page
+ - Both the Water Pump unit and the Sensor unit are flexible to move
+ - Security and Privacy
+
+## Shortages
+ - Cost a lot
+ - Need to learn a lot about LoRa
+ - The water pump is not wireless, not so convinence
+ - Waterproof still need to be solved
+
+
+
+
+
+# Fake LoRa PLAN
+
+## System Architecture
+![LoRa PLAN](./.img/fake-LoRa-PLAN.png)
+
+## Objectives
+ - Available
+ - Reliable
+
+## Devices
+ - VPS x1
+ - Gateway(Raspberry Pi / NodeMCU) x1
+ - ..SI4438 x5
  - ..MCU(Nano / STM32 / NodeMCU) x2
+ - Low Power MCU (LPMCU) x2
 
 ## Features
- - Key Point Low Power
+ - Cost: around ￥300 except Sensors and Raspberry Pi
+ - Ground Sensor Nodes Low Power
  - Simple Network Topology
  - Provide HTTP and WebSocket API, Easy to support a Website/App Demo Page
  - Both the Water Pump unit and the Sensor unit are flexible to move
+ - Easy to dev
 
 ## Shortages
- - The selection of LoRa module is undetermined, hopefully we can decide it in two days after a talk with the iot company we used to study
+ - There maybe noise in 433MHz as it is an open frequency
+ - The security and privacy are hard to guarantee
  - Waterproof still need to be solved
 
 
 ## Other Materials
-
+### MCUs for Low Power Purpose
+ - Arduino Nano (Remove micro USB Module and LED)
+ - Arduino Pro Mini (Remove LED)
 ### Power Consumption for MCUs
 ![](https://www.arduino.cn/data/attachment/forum/201704/01/135127gxjcfs69plcsxyj3.png)