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ESP8266 和ATMega32U4 是很好的搭配，因为后者有更多的串口很方便的做串口Debug 输出。淘宝搜了一下，找到一款四月兄弟出品的Cactus Micro 便入手了，优点是：体积够小。 首先运行一下自带的例子，这个例子会向设定好的IP地址发送HTTP 请求。代码如下，需要修改的是你当前环境中的 WIFI名称，密码和要访问的 IP地址。 [mw_shl_code=c,true]#include <avr/pgmspace.h>
//period between posts, set at 60 seconds
#define DELAY_PERIOD 10000
// Important!! We use pin 13 for enable Serial1
#define WIFI_ENABLE_PIN 13
// TODO
#define SSID "WIFI名称"
#define PASS "WIFI密码"
#define HOST "192.168.1.108" //这是你要http访问的服务器的IP
#define HOST_NAME "localhost"
#define DEBUG 1
#define REQ_PREFIX "POST /event.php\r\n" \
"Host: " HOST_NAME "\r\n" \
"Accept: *" "/" "*\r\n" \
"Content-Length: "
#define REQ_SUFFIX "\r\n" \
"Content-Type: application/x-www-form-urlencoded\r\n" \
"Connection: close\r\n\r\n"
#define printDebug(x) Serial.print(F(x)); Serial1.print(F(x));
#define printlnDebug(x) Serial.println(F(x)); Serial1.println(F(x));
#define printVar(x) Serial.print(x); Serial1.print(x);
#define printlnVar(x) Serial.println(x); Serial1.println(x);
long nextTime;
String prevString;
void clearRx() {
while(Serial1.available() > 0) {
Serial1.read();
}
}
String readString(
long timeout,
String target1,
String target2 = "",
String target3 = "",
String target4 = ""
) {
String data;
char a;
unsigned long start = millis();
while (millis() - start < timeout) {
while(Serial1.available() > 0) {
a = Serial1.read();
if(a == '\0') {
continue;
}
data += a;
Serial.write(a);
}
if (data.indexOf(target1) != -1) {
break;
}
if ((target2 != "") && (data.indexOf(target2) != -1)) {
break;
}
if ((target3 != "") && (data.indexOf(target3) != -1)) {
break;
}
if ((target4 != "") && (data.indexOf(target4) != -1)) {
break;
}
}
return data;
}
bool connectWifi() {
bool connected = false;
long timeout = 10000;
clearRx();
printDebug("AT+CWJAP=\"");
printDebug(SSID);
printDebug("\",\"");
printDebug(PASS);
printlnDebug("\"");
String ret = readString(timeout, "OK", "FAIL");
if (ret.indexOf("OK") != -1) {
return true;
}
return false;
}
void setup() {
Serial1.begin(9600); //connection to ESP8266
Serial.begin(9600); //serial debug
// For atmega32u4, Please set DEBUG = 0 if it not connected to USB
if(DEBUG) {
while(!Serial);
}
pinMode(WIFI_ENABLE_PIN, OUTPUT);
digitalWrite(WIFI_ENABLE_PIN, HIGH);
delay(1000);
//set mode needed for new boards
Serial1.println(F("AT+RST"));
delay(3000);//delay after mode change
Serial1.println(F("AT+CWMODE=1"));
delay(300);
Serial1.println(F("AT+RST"));
delay(3000);
// Sinlge connection
Serial1.println(F("AT+CIPMUX=0"));
delay(500);
if (connectWifi()) {
Serial.print("Connected AP success\r\n");
} else {
Serial.print("Connect AP failure\r\n");
}
printlnDebug("AT+CIFSR");
String ret = readString(10000, "STAIP");
if (ret.indexOf("STAIP") != -1) {
Serial.println(ret);
} else {
Serial.println(F("Not got IP"));
}
nextTime = millis(); //reset the timer
}
void loop() {
//wait for timer to expire
if(nextTime < millis()){
Serial.print("timer reset: ");
Serial.println(nextTime);
httpPost("test=123");
//reset timer
nextTime = millis() + DELAY_PERIOD;
}
}
//web request needs to be sent without the http for now, https still needs some working
void httpPost(String data) {
String ret;
long timeout = 2000;
Serial.println(F("Sending data..."));
delay(1000);
clearRx();
printDebug("AT+CIPSTART=\"TCP\",\"");
printDebug(HOST);
printlnDebug("\",8080");
ret = readString(timeout, "OK", "ALREAY CONNECT", "ERROR", "busy");
//test for a start error
if ((ret.indexOf("OK") != -1) || (ret.indexOf("ALREAY CONNECT") != -1)) {
Serial.println(F("Connected"));
} else {
Serial.println(F("Not connected"));
clearRx();
printlnDebug("AT+CIPCLOSE");
return;
}
//send to ESP8266
clearRx();
delay(1000);
printDebug("AT+CIPSEND=");
printlnVar(
String(REQ_PREFIX).length() +
String(data.length()).length() +
data.length() +
String(REQ_SUFFIX).length()
);
ret = readString(timeout, String(">"), "link is not");
Serial.print(F("Done:"));
Serial.println(ret);
if (ret.indexOf(">") != -1) {
// Send data
Serial.println(F("ready to send:"));
Serial1.print(F(REQ_PREFIX));
Serial1.print(String(data.length()));
Serial1.print(F(REQ_SUFFIX));
Serial1.print(data);
ret = readString(timeout, "OK");
//clearRx();
printlnDebug("AT+CIPCLOSE");
} else {
printlnDebug("AT+CIPCLOSE");
Serial.println(F("Connect timeout"));
delay(1000);
}
clearRx();
}[/mw_shl_code] 运行结果： Debug 输出信息 我还在路由器上查看了一下这个设备的Mac信息： 同时，为了 Debug ，我还在另外一台机器上运行了一个网络调试助手，这个工具需要设定协议为 TCP Server和主机端口以便匹配。
最后说一下这个模块的缺点： 1. 主频只有8Mhz（Lily PadUSB）； 2. 资料不是很多，上面的程序是厂商提供的例子，本身就有错误，好在我在网上搜索到有人碰到了，然后给出修改方法，否则会更折腾一些； 3. 引脚是 3.3V 的电平，直接控制其他模块可能会有问题； 4. 价格比较高，69元
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发表于 2016-7-17 21:29
