Hi, I am new to Arduino. I need help with my project, I connected my circuit to my laptop and opened the Arduino IDE, uploaded the code, but the LCD won't print out anything. I don't know if there is any error. This is the wiring of the circuit.
This is the code.
#include "Arduino.h"
#include "DHT.h"
#include "ESP8266.h"
#include "NewPing.h"
#include "LiquidCrystal_PCF8574.h"
#include "HX711.h"
// Pin Definitions
#define DHT_PIN_DATA 4
#define WIFI_PIN_TX 11
#define WIFI_PIN_RX 10
#define GPS_PIN_TX 3
#define GPS_PIN_RX 2
#define HCSR04_PIN_TRIG 6
#define HCSR04_PIN_ECHO 5
#define SCALE_PIN_DAT 8
#define SCALE_PIN_CLK 7
// Global variables and defines
// ====================================================================
// vvvvvvvvvvvvvvvvvvvv ENTER YOUR WI-FI SETTINGS vvvvvvvvvvvvvvvvvvvv
//
const char *SSID = "WIFI-SSID"; // Enter your Wi-Fi name
const char *PASSWORD = "PASSWORD" ; // Enter your Wi-Fi password
//
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
// ====================================================================
char* const host = "www.google.com";
int hostPort = 80;
// There are several different versions of the LCD I2C adapter, each might have a different address.
// Try the given addresses by Un/commenting the following rows until LCD works follow the serial monitor prints.
// To find your LCD address go to: http://playground.arduino.cc/Main/I2cScanner and run example.
#define LCD_ADDRESS 0x3F
//#define LCD_ADDRESS 0x27
// Define LCD characteristics
#define LCD_ROWS 2
#define LCD_COLUMNS 16
#define SCROLL_DELAY 150
#define BACKLIGHT 255
// object initialization
DHT dht(DHT_PIN_DATA);
ESP8266 wifi(WIFI_PIN_RX,WIFI_PIN_TX);
NewPing hcsr04(HCSR04_PIN_TRIG,HCSR04_PIN_ECHO);
LiquidCrystal_PCF8574 lcdI2C;
HX711 scale(SCALE_PIN_DAT, SCALE_PIN_CLK);
#define calibration_factor 2280 //This value is obtained using the SparkFun_HX711_Calibration sketch https://learn.sparkfun.com/tutorials/load-cell-amplifier-hx711-breakout-hookup-guide?_ga=2.77038550.2126325781.1526891300-303225217.1493631967
// define vars for testing menu
const int timeout = 10000; //define timeout of 10 sec
char menuOption = 0;
long time0;
// Setup the essentials for your circuit to work. It runs first every time your circuit is powered with electricity.
void setup()
{
// Setup Serial which is useful for debugging
// Use the Serial Monitor to view printed messages
Serial.begin(9600);
while (!Serial) ; // wait for serial port to connect. Needed for native USB
Serial.println("start");
dht.begin();
wifi.init(SSID, PASSWORD);
// initialize the lcd
lcdI2C.begin(LCD_COLUMNS, LCD_ROWS, LCD_ADDRESS, BACKLIGHT);
scale.set_scale(calibration_factor);
scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
menuOption = menu();
}
// Main logic of your circuit. It defines the interaction between the components you selected. After setup, it runs over and over again, in an eternal loop.
void loop()
{
if(menuOption == '1') {
// DHT22/11 Humidity and Temperature Sensor - Test Code
// Reading humidity in %
float dhtHumidity = dht.readHumidity();
// Read temperature in Celsius, for Fahrenheit use .readTempF()
float dhtTempC = dht.readTempC();
Serial.print(F("Humidity: ")); Serial.print(dhtHumidity); Serial.print(F(" [%]\t"));
Serial.print(F("Temp: ")); Serial.print(dhtTempC); Serial.println(F(" [C]"));
}
else if(menuOption == '2') {
// ESP8266-01 - Wifi Module - Test Code
//Send request for www.google.com at port 80
wifi.httpGet(host, hostPort);
// get response buffer. Note that it is set to 250 bytes due to the Arduino low memory
char* wifiBuf = wifi.getBuffer();
//Comment out to print the buffer to Serial Monitor
//for(int i=0; i< MAX_BUFFER_SIZE ; i++)
// Serial.print(wifiBuf[i]);
//search buffer for the date and time and print it to the serial monitor. This is GMT time!
char *wifiDateIdx = strstr (wifiBuf, "Date");
for (int i = 0; wifiDateIdx[i] != '\n' ; i++)
Serial.print(wifiDateIdx[i]);
}
else if(menuOption == '3')
{
// Disclaimer: The Ublox NEO-6M GPS Module is in testing and/or doesn't have code, therefore it may be buggy. Please be kind and report any bugs you may find.
}
else if(menuOption == '4') {
// Ultrasonic Sensor - HC-SR04 - Test Code
// Read distance measurment from UltraSonic sensor
int hcsr04Dist = hcsr04.ping_cm();
delay(10);
Serial.print(F("Distance: ")); Serial.print(hcsr04Dist); Serial.println(F("[cm]"));
}
else if(menuOption == '5') {
// LCD 16x2 I2C - Test Code
// The LCD Screen will display the text of your choice.
lcdI2C.clear(); // Clear LCD screen.
lcdI2C.print(" Circuito.io "); // Print print String to LCD on first line
lcdI2C.selectLine(2); // Set cursor at the begining of line 2
lcdI2C.print(" Rocks! "); // Print print String to LCD on second line
delay(1000);
}
else if(menuOption == '6') {
// SparkFun HX711 - Load Cell Amplifier - Test Code
float scaleUnits = scale.get_units(); //scale.get_units() returns a float
Serial.print(scaleUnits); //You can change this to lbs but you'll need to refactor the calibration_factor
Serial.println(" Kg"); //You can change this to lbs but you'll need to refactor the calibration_factor
}
if (millis() - time0 > timeout)
{
menuOption = menu();
}
}
// Menu function for selecting the components to be tested
// Follow serial monitor for instrcutions
char menu()
{
Serial.println(F("\nWhich component would you like to test?"));
Serial.println(F("(1) DHT22/11 Humidity and Temperature Sensor"));
Serial.println(F("(2) ESP8266-01 - Wifi Module"));
Serial.println(F("(3) Ublox NEO-6M GPS Module"));
Serial.println(F("(4) Ultrasonic Sensor - HC-SR04"));
Serial.println(F("(5) LCD 16x2 I2C"));
Serial.println(F("(6) SparkFun HX711 - Load Cell Amplifier"));
Serial.println(F("(menu) send anything else or press on board reset button\n"));
while (!Serial.available());
// Read data from serial monitor if received
while (Serial.available())
{
char c = Serial.read();
if (isAlphaNumeric(c))
{
if(c == '1')
Serial.println(F("Now Testing DHT22/11 Humidity and Temperature Sensor"));
else if(c == '2')
Serial.println(F("Now Testing ESP8266-01 - Wifi Module"));
else if(c == '3')
Serial.println(F("Now Testing Ublox NEO-6M GPS Module - note that this component doesn't have a test code"));
else if(c == '4')
Serial.println(F("Now Testing Ultrasonic Sensor - HC-SR04"));
else if(c == '5')
Serial.println(F("Now Testing LCD 16x2 I2C"));
else if(c == '6')
Serial.println(F("Now Testing SparkFun HX711 - Load Cell Amplifier"));
else
{
Serial.println(F("illegal input!"));
return 0;
}
time0 = millis();
return c;
}
}
}
Please help me :') Thank you.
