ESP-12 wifi模块的GPIO引脚在打开时为高电平，但应为低电平
ESP-12 wifi模块的GPIO引脚在打开时为高电平，但应为低电平
提问于 2016-09-12 20:13:44
我需要帮助。我正在使用ESP-12 WiFi模块自动控制我房间的灯光。但是当我打开我的ESP-12 WiFi模块时，我为继电器输入设置的GPIO2引脚是高的(默认情况下它应该是低的)，然后冻结。但是如果我在打开ESP后连接GPIO引脚，那么它工作正常。我怎样才能避免这个问题。它是连接问题还是与代码有关？？
这是我的电路图
这是我的Arduino代码：
/*
* 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 = "myssid";
const char* password = "mypassword";
IPAddress ip(192, 168, 1, 10); // where xx is the desired IP Address
IPAddress gateway(192, 168, 1, 254); // set gateway to match your network
IPAddress subnet(255, 255, 255, 255); // set subnet mask to match your network
// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);
int status = LOW;
const int pin = 2;
void setup() {
Serial.begin(115200);
delay(100);
// prepare GPIO2
pinMode(pin, OUTPUT);
pinMode(pin, LOW);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.config(ip, gateway, subnet);
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() {
delay(3000);
// 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('$');
Serial.println(req);
client.flush();
// Match the request
if (req.indexOf("status") != -1 || req.indexOf("/status") != -1)
Serial.println("Switch is: "+ status);
else if (req.indexOf("on") != -1 || req.indexOf("/on") != -1)
status = HIGH;
else if (req.indexOf("off") != -1 || req.indexOf("/off") != -1)
status = LOW;
else {
Serial.println("invalid request");
client.stop();
return;
}
// Set GPIO2 according to the request
digitalWrite(pin, status);
// Prepare the response
String response = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nSwitch is now ";
response += status;
response += "</html>\n";
// Send the response to the client
client.print(response);
client.flush();
delay(1);
Serial.println("Client disonnected"+ status);
// The client will actually be disconnected
// when the function returns and 'client' object is detroyed
}回答 1
Stack Overflow用户
发布于 2016-09-12 20:22:56
归功于@gre_gor指出了这一点
pinMode()配置特定引脚，digitalWrite()设置其HIGH/LOW状态。
文档可以在here上找到。
试试这个：
// prepare GPIO2
pinMode(pin, OUTPUT);
digitalWrite(pin, LOW);页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/39450064
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