Hello James and Sara;
From one semi-retired to another, thanks for your post.
I’m using an Wemos D1 ESP8266 and after inserting the Channel ID in X, it works fine for me.
Thanks for the tutorial and post itself.
Best regards,
Francisco.

hello is this code worked for you

typing mistake:
SoftwareSerial nodemcu(8, 9); // Rx = 8 & Tx = 9

𝐀𝐫𝐝𝐮𝐢𝐧𝐨 𝐂𝐨𝐝𝐞:
#include <SoftwareSerial.h>
#include “DHT.h”
#include <Wire.h>
#include <SPI.h>
#define DHTPIN 7
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
SoftwareSerial nodemcu(3, 2); // Rx = 8 & Tx = 9
String myString;

void setup() {
dht.begin();
Serial.begin(9600);
nodemcu.begin(9600);
}
void loop() {
// put your main code here, to run repeatedly:
float h = dht.readHumidity();
Serial.print(F(“Humidity: “));
Serial.println(h);
nodemcu.println(h);

float t = dht.readTemperature();
Serial.print(F(“Temperature: “));
Serial.println(t);
nodemcu.println(t);
// myString = String(“coming from arduino: “) + “\n” + String(“Humidity: “) + String(h) + “\n” + String(“Temperature: “) + String(t) + “\n”;
delay(3000);
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
𝐍𝐨𝐝𝐞𝐦𝐜𝐮 𝐞𝐬𝐩𝟖𝟐𝟔𝟔 𝐂𝐨𝐝𝐞:
#include <SoftwareSerial.h>
#include <ESP8266WiFi.h>
#include <Wire.h>

String apiKey = “*******************”; // Enter your Write API key here
const char *ssid = “xxxxxxx”; // Enter your WiFi Name
const char *pass = “yyyyyyy”; // Enter your WiFi Password
const char *server = “api.thingspeak.com”;
WiFiClient client;
String myString; // complete message from Arduino, which consists of sensors data
float h,t;

void setup() {
// Debug console
Serial.begin(9600);
Serial.println(“Connecting to “);
Serial.println(ssid);

//connect to your local wi-fi network
WiFi.begin(ssid, pass);

//check wi-fi is connected to wi-fi network
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.print(“.”);
}
Serial.println(“”);
Serial.println(“WiFi connected”);
Serial.print(“IP Address: “);
delay(5000);
Serial.println(WiFi.localIP());
delay(5000);
}

void loop() {
h = Serial.read();
// myString=myString+h;
// Serial.println(h);

t = Serial.read();
// myString=myString+t;
// Serial.println(t);

if (client.connect(server, 80)) {

String postStr = apiKey;
postStr += "&field1=";
postStr += String(h);
postStr += "\r\n\r\n";

client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(postStr.length());
client.print("\n\n");
client.print(postStr);


}
client.stop();
Serial.println(“Waiting…”);
delay(3000);
}

I did some more research.
I just got the new computer and have not connected a board yet.
it seems that connecting the board is also a requirement.

that might answer why I never had the problem before and why no one else does.

Hi.
You just need to install the ESP8266 boards in the Arduini IDE and then select an ESP8266 board.
You can check this tutorial: https://randomnerdtutorials.com/installing-esp8266-nodemcu-arduino-ide-2-0/
Regards,
Sara

ESP8266WiFi.h

arduino ide 2.0.0 does not offer this in the library manager I am using.

Hi.
Unfortunately, we don’t have any courses about that subject.
Regards,
Sara