我有esp8266，它连接了3个温度传感器。我将所有数据放入列表中（温度和时间）。 esp8266 工作 9 小时后刷新所有内容，所有数据都会丢失。我尝试检查我的代码，但问题仍然存在。
我预计它只会编辑以前的温度并且不会重置。这是架构（没有 8266）： 没有 esp8266 的架构
这是我的代码：
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <WiFiUdp.h>
#include <EEPROM.h>
#define SENSORS_PIN D7
OneWire oneWire1(SENSORS_PIN);
DallasTemperature sensors(&oneWire1);
const int numSensors = 3;
const int maxRecords = numSensors * 1000;
const int INTERVAL_ADDRESS_IN_EEPROM = 0;
float temperatures[maxRecords];
unsigned long timestamps[maxRecords];
int ids[maxRecords];
int dataIndex = 0;
unsigned long lastMillis = 0;
int interval = 10000;
unsigned long blink = 0;
int blink_type = 0;
const char* ssid = "MY-SSID";
const char* password = "MY-PASSWORD";
ESP8266WebServer server(80);
WiFiUDP udp;
const unsigned int udpPort = 4210;
unsigned long lastUdpMillis = 0;
int sensor_ids[numSensors] = {1,2,3};
void writeToEEPROM(int address, int value) {
EEPROM.put(address, value);
EEPROM.commit();
}
int readFromEEPROM(int address) {
int value;
EEPROM.get(address, value);
return value;
}
void setup() {
pinMode(SENSORS_PIN, INPUT_PULLUP);
pinMode(LED_BUILTIN, OUTPUT);
sensors.begin();
Serial.begin(9600);
EEPROM.begin(512);
interval = readFromEEPROM(INTERVAL_ADDRESS_IN_EEPROM);
if (interval <= 0 || interval > 60000) {
interval = 10000;
writeToEEPROM(INTERVAL_ADDRESS_IN_EEPROM, interval);
Serial.println("Interval set to default value: 10000 milliseconds");
} else {
Serial.printf("Current interval is %d milliseconds\n", interval);
}
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("\nConnected to WiFi");
Serial.print("IP Address: ");
Serial.println(WiFi.localIP());
udp.begin(udpPort);
server.on("/status", []() {
server.send(200, "text/html", "OK");
});
server.on("/setinterval", []() {
int newInterval = server.arg("interval").toInt();
if (newInterval > 0 && newInterval <= 60000) {
interval = newInterval;
writeToEEPROM(INTERVAL_ADDRESS_IN_EEPROM, interval);
Serial.printf("Interval updated to %d milliseconds\n", interval);
server.send(200, "text/html", "<p>Interval set</p>");
} else {
server.send(400, "text/html", "<p>Invalid interval</p>");
}
});
server.on("/exit", []() {
Serial.println("Restarting device...");
server.send(200, "text/html", "Exiting");
ESP.restart();
});
server.on("/temp", []() {
String sensor_id = server.arg("sensor_id");
int limit = server.arg("limit").toInt();
unsigned long currentMillis = millis();
unsigned long time_frame = 0;
bool filterByTime = server.hasArg("time");
unsigned long requestTime = server.arg("time").toInt() * 1000;
if (filterByTime) {
time_frame = currentMillis - requestTime;
} else {
time_frame = 0;
}
if (limit <= 0) {
limit = 10;
}
String response = "{\"temperature_data\":[";
int count = 0;
int totalMatched = 0;
for (int i = 0; i < maxRecords; i++) {
bool isWithinTimeFrame = !filterByTime || timestamps[i] >= time_frame;
bool matchesSensorId = sensor_id.isEmpty() || ids[i] == sensor_id.toInt();
if (ids[i] != 0 && isWithinTimeFrame && matchesSensorId) {
totalMatched++;
if (count < limit) {
if (count > 0) {
response += ",";
}
response += "{\"temp\":" + String(temperatures[i], 2) + ",\"time\":" + String(currentMillis - timestamps[i]) + ",\"sensor_id\":" + ids[i] + "}";
count++;
}
}
}
int remainCount = totalMatched - count;
response += "],\"remain_cnt\":" + String(remainCount) + "}";
server.send(200, "application/json", response);
});
Serial.println("Server started");
server.begin();
}
void loop() {
server.handleClient();
if (millis() - blink >= 100) {
blink = millis();
if (blink_type == 1) {
digitalWrite(LED_BUILTIN, HIGH);
blink_type = 0;
}else{
digitalWrite(LED_BUILTIN, LOW);
blink_type = 1;
}
}
if (millis() - lastMillis >= interval) {
lastMillis = millis();
for (int i = 0; i < numSensors; i++) {
sensors.requestTemperatures();
float temperature = sensors.getTempCByIndex(i);
int lastIndex = (dataIndex - 1 + maxRecords) % maxRecords;
int secondLastIndex = (dataIndex - 2 + maxRecords) % maxRecords;
float lastTemperature = temperatures[lastIndex];
float secondLastTemperature = temperatures[secondLastIndex];
float diffLast = abs(temperature - lastTemperature);
float diffSecondLast = abs(temperature - secondLastTemperature);
if (diffLast <= 0.2 && diffSecondLast <= 0.2) {
timestamps[lastIndex] = millis();
} else {
temperatures[dataIndex] = temperature;
timestamps[dataIndex] = millis();
ids[dataIndex] = sensor_ids[i];
dataIndex = (dataIndex + 1) % maxRecords;
}
}
}
if (millis() - lastUdpMillis > 1000) {
int packetSize = udp.parsePacket();
if (packetSize) {
char packetBuffer[255];
int len = udp.read(packetBuffer, sizeof(packetBuffer) - 1);
packetBuffer[len] = '\0';
if (len > 0) {
String packetString = String(packetBuffer);
if (packetString.indexOf("DISCOVER") >= 0) {
if (packetString.indexOf(WiFi.localIP().toString()) < 0) {
IPAddress remoteIp = udp.remoteIP();
Serial.print("Device with IP: ");
Serial.print(remoteIp);
Serial.print(" is attempting to connect...");
udp.beginPacket(remoteIp, udpPort);
String message = "'DEVICE' ," + String(numSensors) + ", [";
for (int i = 0; i < numSensors; i++) {
message += sensor_ids[i];
if (i < numSensors - 1) message += ", ";
}
message += "]";
udp.print(message);
udp.endPacket();
Serial.println("Response packet sent");
}
}
} else {
Serial.println("Error reading UDP packet");
}
}
lastUdpMillis = millis();
}
}
```
这种情况下的问题很难解决，因为 Arduino 运行在 Espressif SDK 这也不是没有错误！
随着时间的推移，固件出现的问题可能来自 RAM，因为您还有近 40K 的 RAM 可供使用。
1-了解这是否来自您的代码的更好方法是保持 ESP 连接到串行并增加调试消息，并在错误再次发生时检查串行，并使用
ESP.getFreeHeap();2- 考虑使用 char[] 数组而不是 String 对象进行 Web 响应，以尽可能避免动态内存分配。