hi there,i have problem in my code program.i try to make an esp32 as a receiver data from arduino uno and i put two sensor (dht22 and LDR sensor)that i connected in esp32.and display all sensor value on oled display. but my program is not finished, and when i run the problem like this appears. when i add millis() to the program.
this error ive showing below:
"C:\Program Files (x86)\Arduino\tools-builder\ctags\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\Users\ridho\AppData\Local\Temp\arduino_build_754163\preproc\ctags_target_for_gcc_minus_e.cpp"
Compiling sketch...
"C:\Users\ridho\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10812 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Users\ridho\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.3\cores\arduino" "-IC:\Users\ridho\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.3\variants\standard" "-IC:\Users\ridho\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.3\libraries\Wire\src" "-IC:\Users\ridho\Documents\Arduino\libraries\arduino_696289" "-IC:\Users\ridho\Documents\Arduino\libraries\Adafruit_SSD1306" "-IC:\Users\ridho\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.3\libraries\SPI\src" "-IC:\Users\ridho\Documents\Arduino\libraries\Adafruit_Unified_Sensor" "-IC:\Users\ridho\Documents\Arduino\libraries\DHT_sensor_library" "-IC:\Users\ridho\Documents\Arduino\libraries\Adafruit_BusIO" "C:\Users\ridho\AppData\Local\Temp\arduino_build_754163\sketch\main_eps32.ino.cpp" -o "C:\Users\ridho\AppData\Local\Temp\arduino_build_754163\sketch\main_eps32.ino.cpp.o"
C:\Users\ridho\Documents\sppa\PROGRAM FINAL\MENTAH\main_eps32\main_eps32.ino: In function 'void loop()':
main_eps32:62:7: error: 'peviousMillis' was not declared in this scope
peviousMillis = currentMillis;
^~~~~~~~~~~~~
C:\Users\ridho\Documents\sppa\PROGRAM FINAL\MENTAH\main_eps32\main_eps32.ino:62:7: note: suggested alternative: 'previousMillis'
peviousMillis = currentMillis;
^~~~~~~~~~~~~
previousMillis
main_eps32:66:13: error: 'DataSerial' was not declared in this scope
while(DataSerial.available()>0)
^~~~~~~~~~
C:\Users\ridho\Documents\sppa\PROGRAM FINAL\MENTAH\main_eps32\main_eps32.ino:66:13: note: suggested alternative: 'Serial'
while(DataSerial.available()>0)
^~~~~~~~~~
Serial
main_eps32:113:3: error: 'DataSerial' was not declared in this scope
DataSerial.println("Ya");
^~~~~~~~~~
C:\Users\ridho\Documents\sppa\PROGRAM FINAL\MENTAH\main_eps32\main_eps32.ino:113:3: note: suggested alternative: 'Serial'
DataSerial.println("Ya");
^~~~~~~~~~
Serial
Multiple libraries were found for "Adafruit_SSD1306.h"
Used: C:\Users\ridho\Documents\Arduino\libraries\Adafruit_SSD1306
Not used: C:\Users\ridho\Documents\Arduino\libraries\Adafruit_SSD1306_Wemos_Mini_OLED
Not used: C:\Users\ridho\Documents\Arduino\libraries\Adafruit_SSD1306-master
Using library Wire at version 1.0 in folder: C:\Users\ridho\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.3\libraries\Wire
Using library arduino_696289 at version 1.10.10 in folder: C:\Users\ridho\Documents\Arduino\libraries\arduino_696289
Using library Adafruit_SSD1306 at version 2.4.4 in folder: C:\Users\ridho\Documents\Arduino\libraries\Adafruit_SSD1306
Using library SPI at version 1.0 in folder: C:\Users\ridho\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.3\libraries\SPI
Using library Adafruit_Unified_Sensor at version 1.1.4 in folder: C:\Users\ridho\Documents\Arduino\libraries\Adafruit_Unified_Sensor
Using library DHT_sensor_library at version 1.4.2 in folder: C:\Users\ridho\Documents\Arduino\libraries\DHT_sensor_library
Using library Adafruit_BusIO at version 1.7.2 in folder: C:\Users\ridho\Documents\Arduino\libraries\Adafruit_BusIO
exit status 1
'peviousMillis' was not declared in this scope
and this is my code:
#include <Wire.h>
#include<Adafruit_GFX.h>
#include<Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include<DHT.h>
#define RXD2 16 //serial comunication uart RX
#define TXD2 17 //TX serial comunication uart
#define SCREEN_WIDTH 128 //oled display widht,in pixel
#define SCREEN_HEIGHT 64 //oled display height,in pixel
//declaration for an SSD1306 display connected to i2c (sda,scl pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
#define DHTPIN 15 //DIGITAL pin connected to the DHT sensor
#define DHTTYPE DHT22
DHT dht(DHTPIN,DHTTYPE);
//millis as changer delay
unsigned long previousMillis =0; //detect last time checking
//the different of millis and delay is when millis running the data couldnt be stoped,while delay will stoped.
const long interval = 3000;
String arrData[6]; //because the amouunt of data is 7
//cosntants for the pins where sensors are plugged into.
const int sensorPin = 2;
const int ledPin = 5;
//Set up some global variables for the light level an initial value.
int lightInit; // initial value
int lightVal; // light reading
void setup() {
//ldr sensor
// We'll set up the LED pin to be an output.
pinMode(ledPin, OUTPUT);
lightInit = analogRead(sensorPin);
//we will take a single reading from the light sensor and store it in the lightCal
Serial.begin(9600);
dht.begin();
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
delay(2000);
display.clearDisplay();
display.setTextColor(WHITE);
}
void loop() {
//ldr
LDR();
//milis configuration
unsigned long currentMillis = millis(); //read millis time (in mili seocnd)
if (currentMillis - previousMillis >= interval) //if program has not reached 3 second,then the program will skipped
{
//update previous milllis
peviousMillis = currentMillis;
//priority reading data from arduino uno (the result data sending)
//read the data serial
String data ="";
while(DataSerial.available()>0)
{
data += char(DataSerial.read());
}
//remove data space
data.trim();
/*try arduino data if arduino sending empty data it will be ignored.
if it is not empty then data formad will be "10#29.34#9845"
*/
//then parsing the data
//after parsing the data we need array
int index =0;
for (int i=0; i<=data.length();i++)
{
char delimiter = '#';//because using arr so the sign is ('')
if (data[i] != delimiter)
arrData[index] += data[i];
else
index++; //index variabel increase 1
}
// make sure the data sent is complete (LDR, temp, hum)
//the order is 0=voltage, 1=pedal torque, 2=RPM motor ,3=current,4=pwm motor,5=pedal count
if (index == 2)
{
//we display sensor value to serial monitor
Serial.println(arrData[0]);//voltage
Serial.println(arrData[1]); //torque pedal
Serial.println(arrData[2]); //speed(rpm motor)
Serial.println(arrData[3]); //current
Serial.println(arrData[4]); //pwm motor
Serial.println(arrData[5]); //pedal count
Serial.println();//space command
}
arrData[0] = "";//this is left blank otherwise it will add continuously
arrData[1] = "";
arrData[2] = "";
arrData[3] = "";
arrData[4] = "";
arrData[5] = "";
}
//request data to arduino uno
DataSerial.println("Ya");
TemperatureHumidity();
}
void TemperatureHumidity(){
delay(5000);
//read temperature and humidity
float t = dht.readTemperature();
float h = dht.readHumidity();
if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
}
// clear display
display.clearDisplay();
// display temperature
display.setTextSize(1);
display.setCursor(0,0);
display.print("Temperature: ");
display.setTextSize(2);
display.setCursor(0,10);
display.print(t);
display.print(" ");
display.setTextSize(1);
display.cp437(true);
display.write(167);
display.setTextSize(2);
display.print("C");
// display humidity
display.setTextSize(1);
display.setCursor(0, 35);
display.print("Humidity: ");
display.setTextSize(2);
display.setCursor(0, 45);
display.print(h);
display.print(" %");
display.display();
}
void LDR(){
lightVal = analogRead(sensorPin); // read the current light levels
//if lightVal is less than our initial reading withing a threshold then it is dark.
if(lightVal - lightInit < 50)
{
digitalWrite (ledPin, HIGH); // turn on light
}
//otherwise, it is bright
else
{
digitalWrite (ledPin, LOW); // turn off light
}
}
