//gcc grovepi_digital_write.c grovepi.c -Wall
int main(void)
{
//Exit on failure to start communications with the GrovePi
if(init()==-1)
exit(1);
//Set pin mode to output
pinMode(7,1);
while(1)
{
digitalWrite(7,1);
pi_sleep(500);
digitalWrite(7,0);
pi_sleep(500);
}
return 1;
}
//Set speed of the both motors
// arg:
// speed-> 0-255
int set_speed(int speed)
{
if(speed >255)
speed =255;
else if(speed <0)
speed =0;
set_left_speed(speed);
pi_sleep(100);
set_right_speed(speed);
return 1;
}
//Returns the firmware version
int fw_ver(void)
{
int ver;
write_block(fw_ver_cmd,0,0,0);
pi_sleep(100);
ver=read_byte();
read_byte();
if(ver==-1)
return -1;
return ver;
}
//Read ultrasonic sensor
// arg:
// pin -> Pin number on which the US sensor is connected
// return: distance in cm
int us_dist(int pin)
{
int b1,b2;
write_block(us_cmd,pin,0,0);
pi_sleep(80);
b1=read_byte();
b2=read_byte();
if(b1==-1 || b2==-1)
return -1;
return b1* 256 + b2;
}
// Read analog value from Pin
int analogRead(int pin)
{
int b1,b2;
write_block(analog_read_cmd,pin,0,0);
pi_sleep(70);
b1=read_byte();
b2=read_byte();
if(b1==-1 || b2==-1)
return -1;
return b1* 256 + b2;
}
float volt(void)
{
int v[2];
float voltage;
write_block(volt_cmd,0,0,0);
pi_sleep(100);
v[0]=read_byte();
v[1]=read_byte();
voltage=v[0]*256+v[1];
voltage=(5.0*voltage/1024)/.4;
return voltage;
}
//Read the trim value in EEPROM if present else return -3
int trim_read(void)
{
int b1,b2,trim;
if(write_block(trim_read_cmd,0,0,0)==-1)
return -1;
pi_sleep(80);
b1=read_byte();
b2=read_byte();
if(b1==-1 || b2==-1)
return -1;
trim=b1*256+b1;
if (trim ==255)
return -3;
return trim;
}
// Arduino Digital Read
int digitalRead(int pin)
{
int dRead;
if(pin==10||pin==15||pin==0||pin==1)
{
if(write_block(digital_read_cmd,pin,0,0)==-1)
return -1;
pi_sleep(100);
dRead=read_byte();
read_byte();
if(dRead==-1)
return -1;
return dRead;
}
else
return -2;
}
int main(void)
{
float *ht;
//Exit on failure to start communications with the GrovePi
if(init()==-1)
exit(1);
//Set pin mode to input
pinMode(7,0);
while(1)
{
ht=dht(7,0);
printf("humidity = %.02f%% temp = %.02f C\n", ht[0], ht[1]);
//Sleep for 50ms
pi_sleep(50);
}
return 1;
}
int main(void)
{
int dval;
//Exit on failure to start communications with the GrovePi
if(init()==-1)
exit(1);
//Set pin mode to input
pinMode(8,0);
while(1)
{
dval=ultrasonicRead(8);
printf("Digital read %d\n", dval);
//Sleep for 50ms
pi_sleep(50);
}
return 1;
}
