Hi all,
in this case i use 4 pins in my nodemcu for communicate to arduino, i use pin D2, D3 and D5,D6. But the trouble is when i put up pin D2,D3 its always error the program wont uploaded into my nodemcu, but when i release pin D2,D3 and i upload the program and then the program installed correctly then i put up the pin D2,D3 again (when the program has been uploaded) and its no error with the program.
my serial pin
ARDUINO NODEMCU
PIN 2 D2
PIN 3 D3
PIN 5 D5
PIN 6 D6
GROUND GROUND
here's the message for error
Sketch uses 278252 bytes (26%) of program storage space. Maximum is 1044464 bytes.
Global variables use 28152 bytes (34%) of dynamic memory, leaving 53768 bytes for local variables. Maximum is 81920 bytes.
esptool.py v2.8
Serial port COM6
Connecting........_____....._____....._____....._____....._____....._____.....____Traceback (most recent call last):
File "C:\Users\Home\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3/tools/upload.py", line 65, in <module>
esptool.main(cmdline)
File "C:/Users/Home/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/esptool\esptool.py", line 2890, in main
esp.connect(args.before)
File "C:/Users/Home/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/esptool\esptool.py", line 483, in connect
raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error))
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header
_
and here's my nodemcu code
#include <SoftwareSerial.h>
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
const char* ssid = "#####";
const char* password = "#####";
const char* host = "#####";
const int httpPort = 80;
WiFiClient client;
SoftwareSerial s(D6, D5);
SoftwareSerial s1(D3, D2);
int counter0;
int counter1;
String request_string;
HTTPClient http;
void setup() {
s.begin(9600);
s1.begin(9600);
Serial.begin(9600);
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println();
Serial.println("Wifi connected");
Serial.println("IP adress: ");
Serial.println(WiFi.localIP());
Serial.println("NesMask: ");
Serial.println(WiFi.subnetMask());
Serial.println("Getway: ");
Serial.println(WiFi.gatewayIP());
//End
}
void loop() {
if (s.available() ) {
counter0 = s.read();
Serial.println();
Serial.print("Reader0 menerima data ");
Serial.println();
Serial.print("Counter 0 = ");
Serial.print(counter0);
Serial.println();
koneksi_database();
delay(1000);
} else if (s1.available() ) {
counter1 = s1.read();
Serial.println();
Serial.print("Reader1 menerima data ");
Serial.println();
Serial.print("Counter 1 = ");
Serial.print(counter1);
Serial.println();
koneksi_database();
delay(1000);
}
}
void koneksi_database() {
if (!client.connect(host, 80)) {
Serial.println("Gagal Konek");
return;
}
client.print("GET /rfid/index.php?data1=");
client.print(counter0);
client.print("&data2=");
client.print(counter1);
client.print(" HTTP/1.1");
client.println();
client.println("Host: #####");
client.println("Connection: close");
client.println();
Serial.print("Mengirim data ke database");
Serial.println();
Serial.print("Reader 0 = ");
Serial.println(counter0);
Serial.println();
Serial.print("Reader 1 = ");
Serial.println(counter1);
Serial.println();
client.stop();
}
anyway sorry for my bad english 
