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LCD Show Garbage at Arduino Project

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Shahedul

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Dear All,

Recently I develop one project, which is "Induction Bearing heater". The project contain 16x2 LCD display with Arduino UNO R3. When press ON key then an inductor/X-former primary coil get 220VAC power, through a relay and the bearing getting warm as transformer secondary short circuit. A LM35 sensor sensing Heat and showing on LCD. When it reach the preset temperature then relay get stop.
Problem is when I press the on button and machine get run but the LCD show garbage, machine working normally other than display.

Bearing%20Heater.jpg

Code: 
include <LiquidCrystal.h>
include <EEPROM.h>
int RelayPin = ;
int BuzzerPin = ;
int buttonONpin = ;
int buttonOFFpin = ;
int UpPin = ;
int DownPin = ;
int SetTemp = EEPROM.read;
int SensorReading = ;
long time = ;  the last time the output pin was toggled
long debounce = ;  the debounce time, increase if the output ickers
int SensorPin = A;
 initialize the library with the numbers of the interface pins
LiquidCrystal lcd, , , , , ;
void setup 
pinModeRelayPin, OUTPUT;
pinModebuttonONpin, INPUT_PULLUP;
pinModebuttonOFFpin, INPUT_PULLUP;
pinModeSensorPin, INPUT;
lcd.begin, ;  set up the LCDs number of columns and rows:
lcd.setCursor, ;
lcd.printBer.Temp.:;
lcd.setCursor, ;
lcd.printSet.Temp.:;
lcd.setCursor, ;
lcd.printSetTemp,DEC;
lcd.printchar;
lcd.printC;
pinModeUpPin,INPUT;
pinModeDownPin,INPUT;
digitalWriteUpPin,HIGH;
digitalWriteDownPin,HIGH;
pinModeBuzzerPin,OUTPUT;
digitalWriteBuzzerPin,LOW;

void loop 
ifdigitalReadUpPin == LOW  if SW is pressed perform action described in loop

SetTemp++;  Increment Count by 
ifSetTemp > 
SetTemp = ;
lcd.setCursor, ;
lcd.print ;
lcd.setCursor, ;
lcd.printSetTemp,DEC;
lcd.printchar;
lcd.printC;
toneBuzzerPin, , ;
delay;

ifdigitalReadDownPin == LOW  if SW is pressed perform action described in loop

SetTemp--;  Decrement Count by 
ifSetTemp < 
SetTemp = ;
lcd.setCursor, ;
lcd.print ;
lcd.setCursor, ;
lcd.printSetTemp, DEC;
lcd.printchar;
lcd.printC;
toneBuzzerPin, , ;
delay;

if digitalReadbuttonONpin == LOW

digitalWriteRelayPin, HIGH;
digitalWriteBuzzerPin,LOW;


SensorReading = analogReadSensorPin;
int celsius = SensorReading;
lcd.setCursor,;
lcd.printcelsius, DEC;
lcd.printchar;
lcd.printC;
delay;
if celsius > SetTemp

digitalWriteRelayPin,LOW;
toneBuzzerPin, ; digitalWriteBuzzerPin,HIGH;

if digitalReadbuttonOFFpin == LOW

digitalWriteRelayPin,LOW;
noToneBuzzerPin; digitalWriteBuzzerPin,LOW;

EEPROM.write, SetTemp;

Can any one face such problem then inform any idea...
 

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  • Bearing Heater.pdf
    137.5 KB · Views: 62

You are supplying both the Relay and the Arduino module with the same bus, I guess 5v. It in general is not a good deed; It is aggraved due to the fact that the load is strongly inductive. You should think about to use another source, such as 12v to drive an external relay.
 
I am using 5V relay at Arduino Shield then on a 220 VAC Magnetic Contactor by this 5V relay. This Magnetic Contactor supply the inductor/X-former primary coil.
 

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