Why is it my LCD display with this program display different characters that I don't know.
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int pirpin=8, pirled=9, pirrelay=33; //PIR
byte state;
boolean lockLow = true;
boolean takeLowTime;
long unsigned int lowIn;
long unsigned int pause = 10000;
const int led[5] = {18, 20, 22, 24, 26};
const int rel[5] = {34, 36, 38, 40, 31};
const int dec[8] = {15, 17, 19, 21, 23, 25, 27, 29};
const byte indicator[6] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x00};
const byte relayout[6] = {0x0f, 0x0e, 0x0c, 0x08, 0x00, 0x10,};
const byte decoder[10] = {0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29};
int mancnt = 0, man = 28; // manual
int autcnt = 0; // automatic
int configpin = 30; //configuration
int temp, tempPin = A6; //temperature
int ave = 0, analogValue = 0, temperature=0;
int automatic = 0;
unsigned long previoustime = 0;
unsigned long currenttime = 0;
unsigned long interval = 1000;
unsigned long previoustemp = 0;
unsigned long currenttemp = 0;
unsigned long intervaltemp = 480;
void setup(){
lcd.begin(16, 2);
pinMode(configpin, INPUT);
pinMode(man, INPUT);
pinMode(pirpin, INPUT);
pinMode(pirled, OUTPUT);
pinMode(pirrelay, OUTPUT);
pinMode(18, OUTPUT); pinMode(20, OUTPUT); pinMode(22, OUTPUT); pinMode(24, OUTPUT); pinMode(26, OUTPUT);
pinMode(34, OUTPUT); pinMode(36, OUTPUT); pinMode(38, OUTPUT); pinMode(40, OUTPUT); pinMode(31, OUTPUT);
pinMode(15, OUTPUT); pinMode(17, OUTPUT); pinMode(19, OUTPUT); pinMode(21, OUTPUT); pinMode(23, OUTPUT); pinMode(25, OUTPUT); pinMode(27, OUTPUT); pinMode(29, OUTPUT);
for(int i = 0; i < 10; i++){
digitalWrite(pirled, HIGH);
delay(500);
digitalWrite(pirled, LOW);
delay(500);
}
digitalWrite(pirled, LOW);
}
void loop(){
int config = digitalRead(configpin);
int maninc = digitalRead(man);
pirv();
output();
switch(config){
case HIGH : Manual();
leddigit(indicator[mancnt]);
relaydigit(relayout[mancnt]);
if(maninc == HIGH){
mancnt++;
leddigit(indicator[mancnt]);
relaydigit(relayout[mancnt]);
delay(100);
if(mancnt>4) {mancnt=0;}
while(digitalRead(man) == HIGH) {}
} break;
case LOW : int autinc = digitalRead(man);
temp = analogRead(tempPin);
temp = temp * 0.48848125;
currenttime = millis();
tempdisplay();
decdigit(decoder[autcnt]);
int count = 20;
if(autinc == HIGH){
autcnt++;
decdigit(decoder[autcnt]);
delay(100);
if(autcnt>9) {autcnt=0;}
while(digitalRead(man) == HIGH) {}
}
currenttemp = millis();
Temperature();
count = count + autcnt;
automatic = temperature - count;
if(automatic>=7){
leddigit(indicator[4]);
relaydigit(relayout[4]);
}
else if(automatic<7 && automatic>=5){
leddigit(indicator[3]);
relaydigit(relayout[3]);
}
else if(automatic<5 && automatic>=3){
leddigit(indicator[2]);
relaydigit(relayout[2]);
}
else if(automatic<3 && automatic>=2){
leddigit(indicator[1]);
relaydigit(relayout[1]);
}
else if(automatic<2 && automatic>=0){
leddigit(indicator[0]);
relaydigit(relayout[0]);
}
else if(automatic<0){
leddigit(indicator[5]);
relaydigit(relayout[5]);
}break;
}
}
void leddigit(byte indicator){
ledsegment(indicator);
}
void relaydigit(byte relayout){
relaysegment(relayout);
}
void decdigit(byte decoder){
decodersegment(decoder);
}
void decodersegment(byte decoder){
for(int d=0; d<8; d++){
int bit = bitRead(decoder, d);
digitalWrite(dec[d], bit);
}
}
void ledsegment(byte indicator){
for(int l=0; l<5; l++){
int bit = bitRead(indicator, l);
digitalWrite(led[l], bit);}
}
void relaysegment(byte relayout){
for(int r=0; r<5; r++){
int bit = bitRead(relayout, r);
digitalWrite(rel[r], bit);}
}
void Manual(){
lcd.clear();
lcd.print(" MANUAL");
lcd.display();
delay(10);
}
void tempdisplay(){
if(currenttime - previoustime > interval){
previoustime = currenttime;
lcd.clear();
lcd.print("Temperature ");
lcd.print(temp);
lcd.print(" C");
lcd.display();
}
}
void Temperature(){
if(currenttemp - previoustemp > intervaltemp){
previoustemp = currenttemp;
for(int q=0; q<16; q++){
analogValue += analogRead(A6);
delay(30);
}
ave = analogValue/16;
if(ave>=37 && ave<39){
temperature = 17;
}
else if(ave>=39 && ave<41){
temperature = 18;
}
else if(ave>=41 && ave<43){
temperature = 19;
}
else if(ave>=43 && ave<45){
temperature = 20;
}
else if(ave>=45 && ave<47){
temperature = 21;
}
else if(ave>=47 && ave<49){
temperature = 22;
}
else if(ave>=49 && ave<51){
temperature = 23;
}
else if(ave>=51 && ave<53){
temperature = 24;
}
else if(ave>=53 && ave<55){
temperature = 25;
}
else if(ave>=55 && ave<57){
temperature = 26;
}
else if(ave>=57 && ave<59){
temperature = 27;
}
else if(ave>=59 && ave<61){
temperature = 28;
}
else if(ave>=61 && ave<63){
temperature = 29;
}
else if(ave>=63 && ave<65){
temperature = 30;
}
else if(ave>=65 && ave<67){
temperature = 31;
}
else if(ave>=67 && ave<69){
temperature = 32;
}
else if(ave>=69 && ave<71){
temperature = 33;
}
else if(ave>=71 && ave<73){
temperature = 34;
}
else if(ave>=73 && ave<75){
temperature = 35;
}
else if(ave>=75 && ave<77){
temperature = 36;
}
else if(ave>=77 && ave<79){
temperature = 37;
}
else if(ave>=79 && ave<81){
temperature = 38;
}
else if(ave>=81 && ave<83){
temperature = 39;
}
else if(ave>=83){
temperature = 40;
}
analogValue = 0;
delay(1);
}
}
void pirv(){
if(digitalRead(pirpin) == HIGH){
if(lockLow){
lockLow = false;
state = HIGH;
}
takeLowTime = true;
}
if(digitalRead(pirpin) == LOW){
if(takeLowTime){
lowIn = millis();
takeLowTime = false;
}
if(!lockLow && millis() - lowIn > pause){
lockLow = true;
state = LOW;
}
}
}
void output(){
digitalWrite(pirled, state);
digitalWrite(pirrelay, state);
}
I want to display a "Manual" character and a real time displaying ambient temperature. The problem is when I incorporated the PIR function which is in millis() or work simultaneously with the others. The lcd display disrupts and display random characters.
