Ameba Arduino: 使用 Ameba 來檢測周圍的WiFiAmeba Arduino: Scan available WiFi hotspots in the surroundings

材料準備

Ameba x 1

天線 x 1

範例說明

這個範例裡，我們使用Ameba來檢測周圍的WiFi訊號，並將檢測到WiFi的名稱，加密方式，信號強度等信息打印出來。

首先先確定天線已經接上

接著確定板子是 Ameba, “Tools” -> “Board” -> “Arduino Ameba”

然後打開 Scan Networks 的範例, “File” -> “Examples” -> “AmebaWiFi” -> “ScanNetworks” :

上傳程式碼之後，按下Ameba的Reset按鈕, 這時候會看到**Scan Networks**下會有搜索到WiFi的數目以及每一個WiFi的訊息。

程式碼說明

首先使用的是顯示Ameba自己的物理地址WiFi.macAddress(mac):
https://www.arduino.cc/en/Reference/WiFiMACAddress

然後開始搜索周圍WiFi環境的WiFi.scanNetworks()
https://www.arduino.cc/en/Reference/WiFiScanNetworks

在打印WiFi具體訊息時使用到的有
顯示WiFi的名稱WiFi.SSID(thisNet):
https://www.arduino.cc/en/Reference/WiFiSSID

顯示WiFi的訊號強度WiFi.RSSI(thisNet):
https://www.arduino.cc/en/Reference/WiFiRSSI

顯示WiFi的加密方式WiFi.encryptionType(thisNet):
https://www.arduino.cc/en/Reference/WiFiEncryptionType

與Arduino的差異

Arduino在完成WiFi的操作時，需要另外使用WiFi Shield來作為WiFi模塊，因此在使用WiFi是需要#include 來使用SPI與WiFi模塊進行通訊。
但是Ameba自身就具有WiFi模塊的功能，因此，不需要#include 。若想要使用Arduino的範例，要先刪掉這一項。

Materials

Ameba x 1

Procedure

In this example, we use Ameba to scan available WiFi hotspots in the surroundings, and prints the SSID, encryption type, signal strngth information of each detected hotspot.

First, make sure Ameba is selected in Arduino IDE: "Tools" -> "Board" -> "Arduino Ameba"

Open the "ScanNetworks" example in "File" -> "Examples" -> "AmebaWiFi" -> "ScanNetworks":

Then upload the sample code, and press the reset button on Ameba. Afterwards, you can see "**Scan Networks**" message appears, with the detected WiFi hotspots and the information of each hotspot.

Code Reference

First we use WiFi.macAddress(mac) to getthe MAC address of Ameba:
https://www.arduino.cc/en/Reference/WiFiMACAddress

Then we use WiFi.scanNetworks() to detect WiFi hotspots:
https://www.arduino.cc/en/Reference/WiFiScanNetworks

To get information of detected WiFi hotspot:
We use WiFi.SSID(thisNet) to retrieve SSID of a network:
https://www.arduino.cc/en/Reference/WiFiSSID

We use WiFi.RSSI(thisNet) to get the signal strength of the connection to the router:
https://www.arduino.cc/en/Reference/WiFiRSSI

We use WiFi.encryptionType(thisNet) to get the encryption type of the network:
https://www.arduino.cc/en/Reference/WiFiEncryptionType

Comparison with Arduino

In the Arduino platform, we need to add an extra WiFi shield to be the WiFi module to realize the WiFi connection. And we have to #include to use SPI to communicate with WiFi module.
However, Ameba is already equipped with WiFi module. Therefore, #include is not needed.