我对 nodemcu 和 thingspeak 的概念很陌生。我正在做一个灌溉项目。我需要通过nodemcu将数据发送到thingspeak。

我在nodemcu上传的代码如下所示：

#include <ThingSpeak.h>
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
const char* ssid = "xxx"; //Your Network SSID
const char* password = "xxxx"; //Your Network Password
int val1;
//int val2;

#define input = 5;
//#define input = 4;

WiFiClient client; 
unsigned long myChannelNumber = xxxx; //Your Channel Number (Without Brackets) 
const char * myWriteAPIKey = "xxxx"; //Your Write API Key 
void setup() 
{
Serial.begin(115200);
delay(10);
//Connect to WiFi network 
WiFi.begin(ssid, password);
ThingSpeak.begin(client); 
} 
void loop() 
{ 
val1 = analogRead(5);//Read Analog values and Store in val variable 
val1 = val1/3;
Serial.println(val1);
//val2 = analogRead(4);//Read Analog values and Store in val variable 
//val2 = val2/100;

delay(1000); 
ThingSpeak.writeField(myChannelNumber, xxx,val1, myWriteAPIKey); //Update in ThingSpeak 
//ThingSpeak.writeField(myChannelNumber, xxx,val2, myWriteAPIKey); //Update in ThingSpeak

delay(100); 
}

我试过这个代码。我的问题是数据没有发送到thingspeak。谁能帮我解决这个问题？谢谢。