Hi, I am a novice programmer trying to achieve the following by combining the codes for the projects 13.1 Control a DC Motor with a Potentiometer and Project 20.1 I2C LCD1602 to have the I2C LCD display the speed that is shown on the terminal window when executing the project 13.1.
I've attached a code to first display the time while running the motor with a potentiometer but I can't get the code to compile... Can anyone guide me to achieve this? and teach me what I am doing wrong?
-------- Code ---------------
#include <wiringPi.h>
#include <wiringPiI2C.h>
#include <stdio.h>
#include <stdlib.h>
#include <softPwm.h>
#include <math.h>
#include <stdlib.h>
#include <ADCDevice.hpp>
#include <pcf8574.h>
#include <lcd.h>
#include <time.h>
int pcf8574_address = 0x27; // PCF8574T:0x27, PCF8574AT:0x3F
#define BASE 64 // BASE any number above 64
//Define the output pins of the PCF8574, which are directly connected to the LCD1602 pin.
#define RS BASE+0
#define RW BASE+1
#define EN BASE+2
#define LED BASE+3
#define D4 BASE+4
#define D5 BASE+5
#define D6 BASE+6
#define D7 BASE+7
#define motorPin1 2 //define the pin connected to L293D
#define motorPin2 0
#define enablePin 3
ADCDevice *adc; // Define an ADC Device class object
//Map function: map the value from a range to another range.
long map(long value,long fromLow,long fromHigh,long toLow,long toHigh){
return (toHigh-toLow)*(value-fromLow) / (fromHigh-fromLow) + toLow;
}
//motor function: determine the direction and speed of the motor according to the ADC
void motor(int ADC){
int value = ADC -128;
if(value>0){
digitalWrite(motorPin1,HIGH);
digitalWrite(motorPin2,LOW);
printf("turn Forward...\n");
}
else if (value<0){
digitalWrite(motorPin1,LOW);
digitalWrite(motorPin2,HIGH);
printf("turn Back...\n");
}
else {
digitalWrite(motorPin1,LOW);
digitalWrite(motorPin2,LOW);
printf("Motor Stop...\n");
}
softPwmWrite(enablePin,map(abs(value),0,128,0,100));
printf("The PWM duty cycle is %d%%\n",abs(value)*100/127);//print the PMW duty cycle
}
int lcdhd;// used to handle LCD
void printDataTime(){//used to print system time
time_t rawtime;
struct tm *timeinfo;
time(&rawtime);// get system time
timeinfo = localtime(&rawtime);//convert to local time
printf("%s \n",asctime(timeinfo));
lcdPosition(lcdhd,0,1);// set the LCD cursor position to (0,1)
lcdPrintf(lcdhd,"Time:%02d:%02d:%02d",timeinfo->tm_hour,timeinfo->tm_min,timeinfo->tm_sec); //Display system time on LCD
}
int detectI2C(int addr){
int _fd = wiringPiI2CSetup (addr);
if (_fd < 0){
printf("Error address : 0x%x \n",addr);
return 0 ;
}
else{
if(wiringPiI2CWrite(_fd,0) < 0){
printf("Not found device in address 0x%x \n",addr);
return 0;
}
else{
printf("Found device in address 0x%x \n",addr);
return 1 ;
}
}
}
int main(void){
int i;
printf("Program is starting ...\n");
wiringPiSetup();
if(detectI2C(0x27)){
pcf8574_address = 0x27;
}else if(detectI2C(0x3F)){
pcf8574_address = 0x3F;
}else{
printf("No correct I2C address found, \n"
"Please use command 'i2cdetect -y 1' to check the I2C address! \n"
"Program Exit. \n");
return -1;
}
pcf8574Setup(BASE,pcf8574_address);//initialize PCF8574
for(i=0;i<8;i++){
pinMode(BASE+i,OUTPUT); //set PCF8574 port to output mode
}
digitalWrite(LED,HIGH); //turn on LCD backlight
digitalWrite(RW,LOW); //allow writing to LCD
lcdhd = lcdInit(2,16,4,RS,EN,D4,D5,D6,D7,0,0,0,0);// initialize LCD and return “handle” used to handle LCD
if(lcdhd == -1){
printf("lcdInit failed !");
return 1;
}
while(1){
printDataTime(); // print system time
delay(1000);
}
return 0;
adc = new ADCDevice();
printf("Program is starting ... \n");
if(adc->detectI2C(0x48)){ // Detect the pcf8591.
delete adc; // Free previously pointed memory
adc = new PCF8591(); // If detected, create an instance of PCF8591.
}
else if(adc->detectI2C(0x4b)){// Detect the ads7830
delete adc; // Free previously pointed memory
adc = new ADS7830(); // If detected, create an instance of ADS7830.
}
else{
printf("No correct I2C address found, \n"
"Please use command 'i2cdetect -y 1' to check the I2C address! \n"
"Program Exit. \n");
return -1;
}
wiringPiSetup();
pinMode(enablePin,OUTPUT);//set mode for the pin
pinMode(motorPin1,OUTPUT);
pinMode(motorPin2,OUTPUT);
softPwmCreate(enablePin,0,100);//define PMW pin
while(1){
int value = adc->analogRead(0); //read analog value of A0 pin
printf("ADC value : %d \n",value);
motor(value); //make the motor rotate with speed(analog value of A0 pin)
delay(100);
}
return 0;
}
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