Play ESP-01 with Arduino
1. 牛刀小試~點亮LED
器材準備
開工了
先將ESP-01接上USB燒錄器,記得切到燒錄模式,插上電腦
打開ARDUINO軟體,複製下列程式碼貼上
void setup() {
pinMode(2,OUTPUT);
}
void loop() {
digitalWrite(2,HIGH);
delay(1000);
digitalWrite(2,LOW);
delay(1000);
}
程式裡2的意思是使用GPIO2,因為不需與UNO連接,所以TX.RX這兩個IO也可以拿來使用,這樣板上一共有4個GPIO可用(0、1、2、3),如下圖:
程式寫好後,記得先檢查一下USB的序列埠有沒有選對,再按上傳
程式上傳成功後,開始接線,請注意ESP-01上面的VCC與CH_PD要接到電源板的3.3V,若接到5V可能會導致晶片燒燬!!
線路接好,再把電源板插上變壓器,就可以看到LED燈開始一閃一閃了
搭上網路
ESP-01本身是有連網能力的,接著我們用內建的範例來看看它強大的功能,
開啟Arduino軟體,從檔案>>範例>>ESP8266WiFi>>WiFiWebServer
程式內容如下,這裡我們只需要修改你所在環境的無線網路SSID與密碼(第12、13行),再上傳即可,有夠簡單吧~
/*
* This sketch demonstrates how to set up a simple HTTP-like server.
* The server will set a GPIO pin depending on the request
* http://server_ip/gpio/0 will set the GPIO2 low,
* http://server_ip/gpio/1 will set the GPIO2 high
* server_ip is the IP address of the ESP8266 module, will be
* printed to Serial when the module is connected.
*/
#include <ESP8266WiFi.h>
const char* ssid = "MY_SSID";
const char* password = "MY_PASSWORD";
// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);
void setup() {
Serial.begin(115200);
delay(10);
// prepare GPIO2
pinMode(2, OUTPUT);
digitalWrite(2, 0);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Start the server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.println(WiFi.localIP());
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}
// Read the first line of the request
String req = client.readStringUntil('\r');
Serial.println(req);
client.flush();
// Match the request
int val;
if (req.indexOf("/gpio/0") != -1)
val = 0;
else if (req.indexOf("/gpio/1") != -1)
val = 1;
else {
Serial.println("invalid request");
client.stop();
return;
}
// Set GPIO2 according to the request
digitalWrite(2, val);
client.flush();
// Prepare the response
String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now ";
s += (val)?"high":"low";
s += "</html>\n";
// Send the response to the client
client.print(s);
delay(1);
Serial.println("Client disonnected");
// The client will actually be disconnected
// when the function returns and 'client' object is detroyed
}
上傳完成後,接好線路(電路圖同上面blink範例的接法),接著找出你的ESP-01配發到的IP是多少(進無線AP管理介面查看)
以本例取得的IP是192.168.0.104
只要用在瀏覽器的網址列輸入 http://192.168.0.104/gpio/1 就可以點亮LED燈
輸入 http://192.168.0.104/gpio/0 關閉LED燈
把LED改成繼電器,那您就可以透過網路來開關家裡的電扇電燈等電器了