I finally received my 5" nextion screen about a week ago and have been trying everything I can to send data to textboxes on the screen and the only way I was able to get it to work was with the following code that I found in an instructable by Gideon Rossouwv. Using his code and nextion screen tutorial everything works fine. However when I pull out his code and put it in my sketch I never see the "serial on" and nothing shows up in the textbox. My code is the last bit. PS-The sensor shows correctly in the Arduino ide serial monitor.
Gideon Rossouwv's code
#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); /*Even though you can use the hardware serial port in this case I think it is better to
leave the hardware serial open for debugging purposes*/
void setup() {
// put your setup code here, to run once:
pinMode(0, INPUT); //This is our analog input pin
Serial.begin(57600); //open the hardware serial port
while (!Serial) { // wait for serial port to connect. Needed for native USB port only
;
}
Serial.println("Serial On"); //Print this messages when the serial port is connected
mySerial.begin(9600); // set the data rate for the SoftwareSerial port
}
void loop() {
String sendThis = ""; //Declare and initialise the string we will send
// delay(300); //Probably unneccessary, but I give the screen some time to respond
sendThis = "n0.val="; //Build the part of the string that we know
sendThis.concat(analogRead(0)); //Add the variable we want to send
writeString(sendThis); /*Use a function to write the message character by character to the Nextion because
mySerial.write(sendThis) gives you an error due to a datatype mismatch*/
}
//NOTE: A great big thanks to: RamjetX for writing this function. You can find his/her post here: http://forum.arduino.cc/index.php?topic=89143.0. Please go give him/her some Karma!
void writeString(String stringData) { // Used to serially push out a String with Serial.write()
for (int i = 0; i < stringData.length(); i++)
{
mySerial.write(stringData[i]); // Push each char 1 by 1 on each loop pass
}
mySerial.write(0xff); //We need to write the 3 ending bits to the Nextion as well
mySerial.write(0xff); //it will tell the Nextion that this is the end of what we want to send.
mySerial.write(0xff);
}// end writeString function
My code
#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11);
void setup() {
pinMode(dataIN, INPUT); //IR SENSOR INPUT
Serial.begin(57600); //SERIAL BEGIN
while (!Serial) { //SCREEN SERIAL
; //SCREEN SERIAL
} //SCREEN SERIAL
Serial.println("Serial On"); //SCREEN SERIAL
mySerial.begin(9600); //SCREEN SERIAL
}
void loop() {
rpm = 0; //RPM MEASUREMENT
currentstate = digitalRead(dataIN); //RPM MEASUREMENT
if ( prevstate != currentstate) //RPM MEASUREMENT
{ //RPM MEASUREMENT //RPM MEASUREMENT
if ( currentstate == HIGH ) //RPM MEASUREMENT
{ //RPM MEASUREMENT //RPM MEASUREMENT
duration = ( micros() - prevmillis ); //RPM MEASUREMENT
rpm = (60000000 / duration); //RPM MEASUREMENT
prevmillis = micros(); //RPM MEASUREMENT
} //RPM MEASUREMENT
} //RPM MEASUREMENT
prevstate = currentstate; //RPM MEASUREMENT
Serial.print("RPM = "); //SERIAL DEBUGGING
Serial.println(rpm); //SERIAL DEBUGGING
String t1text = ""; //SCREEN SERIAL
t1text = "page1.t1.txt="; //SCREEN SERIAL
t1text.concat(rpm);
writeString(t1text); //SCREEN SERIAL
}
void writeString(String stringData) { //SCREEN FUNCTION
for (int i = 0; i < stringData.length(); i++) //SCREEN FUNCTION
{ //SCREEN FUNCTION //SCREEN FUNCTION
mySerial.write(stringData[i]); //SCREEN FUNCTION
}//SCREEN FUNCTION //SCREEN FUNCTION
mySerial.write(0xff); //SCREEN FUNCTION
mySerial.write(0xff); //SCREEN FUNCTION
mySerial.write(0xff); //SCREEN FUNCTION
}
