我使用ESP8266和RDM6300为IoT考勤系统做了一个项目。但是，我可以使用用于家庭WiFi的WiFiMulti.addAP（）函数连接到wifi，但是不能使用WiFi.begin（）进行连接。
我尝试使用 WiFi.begin（）而不是WiFiMulti.addAP（）函数连接到我的移动热点，但esp8266无法连接。实际上， WiFi.begin（）也无法连接到以前由WiFiMulti.addAP（）连接的同一wifi路由器。串行监视器不断显示以下错误。
Exception (3):
epc1=0x4020970d epc2=0x00000000 epc3=0x00000000 excvaddr=0x4003bfc9 depc=0x00000000
>>>stack>>>
ctx: cont
sp: 3ffffbc0 end: 3fffffc0 offset: 01a0
3ffffd60: 00000000 00000004 3ffffe40 3ffffef0
3ffffd70: 4010156c 0000049c 000003fd 40209837
3ffffd80: 0000049c 00001000 000003fd 4010156c
3ffffd90: 40106980 3ffe85ad 3ffffe40 402354f1
3ffffda0: 401004a5 402355db 3fff0c1c 0000049c
3ffffdb0: 000003fd 3ffffef0 3fff0c1c 402355be
3ffffdc0: ffffff00 55aa55aa 00000035 00000020
3ffffdd0: 00000020 00000048 0000004a aa55aa55
3ffffde0: 000003ff 40235aa8 3fff0c1c 3fff0c1c
3ffffdf0: 000000ff 3fff0c1c 0000049c 00000000
3ffffe00: 401004a5 00000001 3fff0c2c 40235cc2
3ffffe10: 00000008 3fff0c1c 000000ff 3ffffef0
3ffffe20: 3fffff10 3fff0c53 00000035 00000020
3ffffe30: 3fff0cdc 3fffff51 00000001 40235d72
3ffffe40: 3ffffef0 40242be0 00000000 0000000c
3ffffe50: 3fff101c 3fffff10 3fff6f54 40235d41
3ffffe60: 3fff0c1c 40235da8 3ffe84dc 3ffe85ae
3ffffe70: 402019ca 3ffe85ae 3ffe85b3 40201927
3ffffe80: 61666152 00000074 3ffffe60 40204666
3ffffe90: 4000e243 00000030 3ffffe60 402046c4
3ffffea0: 616d7374 2e2e3730 3ffffe00 40204901
3ffffeb0: 3ffffdf0 0693b740 000035af fffffffe
3ffffec0: 00000090 3fffc6fc 00000003 40201dd4
3ffffed0: 3ffee50c 000000f2 000000f2 40206bf8
3ffffee0: 8ab9b001 00a0a64e 00000000 40206057
3ffffef0: 78666152 3fff0c00 0000049c 00000000
3fffff00: 00000a2e 0000007f 3fff0c1c 402356c6
3fffff10: 61666172 66617274 32317461 40209500
3fffff20: 00000001 3fff0c1c 00000000 402099e8
3fffff30: 000003fd 402351a3 00000000 40101538
3fffff40: 00000001 001ce8e7 3ffeea78 402351be
3fffff50: 40235100 00000001 00000081 00000002
3fffff60: 00000004 00000000 3ffee544 00000001
3fffff70: 402083ea 000003e8 000003e8 3ffee870
3fffff80: 3ffee544 00000000 3ffee750 40201194
3fffff90: 00000000 00000000 ffefeffe feefeffe
3fffffa0: 3fffdad0 00000000 3ffee840 40207830
3fffffb0: feefeffe feefeffe 3ffe8520 40101809
<<<stack<<<
ets Jan 8 2013,rst cause:2, boot mode:(3,6)
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v8b899c12
~ld
这是我上传到ESP8266的代码：
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
#include <rdm6300.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
#define RDM6300_RX_PIN 2
#define READ_LED_PIN 14
ESP8266WiFiMulti WiFiMulti;
Rdm6300 rdm6300;
String RFID[] = {"5958666", "5958741"};
String SID[] = {"161-115-123", "161-115-124"};
String NAME[] = {"Rafat", "Saney"};
int flag[2] = {0, 0};
void setup() {
Serial.begin(115200);
display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
pinMode(READ_LED_PIN, OUTPUT);
digitalWrite(READ_LED_PIN, LOW);
rdm6300.begin(RDM6300_RX_PIN);
Serial.println();
Serial.println();
Serial.println();
OLED("Connecting...");
for (uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] WAIT %d...\n", t);
Serial.flush();
delay(1000);
}
WiFi.mode(WIFI_STA);
WiFi.begin("custom", "customjack.xyz");
Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
}
Serial.println("");
Serial.println("Connected");
OLED("Connected");
Serial.println(WiFi.localIP());
}
void loop() {
// wait for WiFi connection
if ((WiFi.status() == WL_CONNECTED)) {
label:
OLED("Place Your ID");
String tag;
int check = 0;
if (rdm6300.update())
{
tag = String(rdm6300.get_tag_id());
Serial.println(tag);
for (int i = 0; i < 1; i++)
{
if (RFID[i] == tag) // checking validity of RFID
{
tone(READ_LED_PIN, 392);
delay(100);
noTone(READ_LED_PIN);
check = 1;
if (flag[i] == 1) // Flag=1 meaans already attendance counted
{
Serial.println("Attendance Already Counted");
OLED("Already Counted");
delay(2000);
goto label;
}
OLED("Welcome "+NAME[i]);
flag[i] = 1;
WiFiClient client;
HTTPClient http;
Serial.print("[HTTP] begin...\n");
String url = "http://metrounisas.000webhostapp.com/action.php?ID=" + SID[i];
if (http.begin(client, url ) ) { // HTTP
Serial.print("[HTTP] GET...\n");
// start connection and send HTTP header
int httpCode = http.GET();
// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("[HTTP] GET... code: %d\n", httpCode);
// file found at server
if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
String payload = http.getString();
Serial.println(payload);
}
} else {
Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
}
http.end();
} else {
Serial.printf("[HTTP} Unable to connect\n");
}
}
}
if (check == 0) {
tone(READ_LED_PIN, 261);
noTone(READ_LED_PIN);
Serial.println("Invalid RFID");
OLED("INVALID ID");
delay(2000);
}
}
}
delay(1000);
}
void OLED(String txt){
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE,BLACK);
display.setCursor(30, 30);
display.println(txt);
display.display();
delay(2000);
}
答案 0 :(得分：0)
"."之后的延迟问题，因此解决方案是像这样在其之前添加500ms左右的延迟：
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}