Hello,
Recently i have been having a programming problem with my Arduino Mega 2560.
I have connected a Wemos D1 Mini to an Arduino Mega 2560 via the 2nd Serial port on the mega.
MEGA/WEMOS
TX (pin 16) / Logic Level Shift Converter / RX
RX (pin 17) /TX
5v/5v (It is stepped down on the Wemos)
Gnd/Gnd
Here is a sample code
void setup() {
// put your setup code here, to run once:
Serial2.begin(115200);
Serial.begin(115200);
}
void loop() {
// put your main code here, to run repeatedly:
if(Serial2.available()>0) //Checks is there any data in buffer
{
Serial.print("We got:");
Serial.print(char(Serial2.read())); //Read serial data byte and send back to serial monitor
}
else
{
Serial2.write("AT\r\n");
delay(1000); // Wait for a second
}
}
Attached is the way it is connected
When i have only the Arduino Mega plugged in, i get this through the serial monitor
Nothing.
When i only plug in the Wemos D1 Mini i get this:
WIFI CONNECTED
AT
OK
AT
OK
WIFI GOT IP
AT
OK
AT
OK
AT
OK
AT
OK
AT
OK
AT
OK
AT
OK
AT
OK
AT
OK
AT
OK
I am really stuck here, any help would be greatly appreciated!
Thank you soo much.
John
EDIT:
Sorry:
I should of said that i have the ESP8266 Flashed with AI thinker.
I wanted to have the Mega send data to the ESP8266, then the mega print what the ESP8266 responded with
And here is the picture.
I also tried to get the Serial data basics working, didnt have much luck.
This was the code i used
// Example 2 - Receive with an end-marker
const byte numChars = 32;
char receivedChars[numChars]; // an array to store the received data
boolean newData = false;
void setup() {
Serial.begin(115200);
Serial2.begin(115200);
delay(1000);
Serial.println("<Arduino is ready>");
Serial2.write("AT\r\n");
}
void loop() {
recvWithEndMarker();
showNewData();
delay(1000);
}
void recvWithEndMarker() {
static byte ndx = 0;
char endMarker = '\n';
char rc;
while (Serial2.available() > 0 && newData == false) {
rc = Serial2.read();
if (rc != endMarker) {
receivedChars[ndx] = rc;
ndx++;
if (ndx >= numChars) {
ndx = numChars - 1;
}
}
else {
receivedChars[ndx] = '\0'; // terminate the string
ndx = 0;
newData = true;
}
}
}
void showNewData() {
if (newData == true) {
Serial.print("This just in ... ");
Serial.println(receivedChars);
newData = false;
}
}
