Tambahkan resistor sebelum Button sebesar 1k ohm
2. Gambar Rangkaian Simulasi [Kembali]
3. Video Simulasi [Kembali]
4. Prinsip Kerja Rangkaian [Kembali]
Pada percobaan 2 diminta untuk membuat rangkaian seperti yang ada pada modul, yang mana dibuat rangkaian untuk sistem komunikasi SPI. Dengan kondisi menambahkan resistor sebelum Button sebesar 1k ohm. Digunakan board rangkaian SIMULINO UNO sebagai papan simulasi untuk arduino uno, resistor, button dan led. Pada rangkaian ini digunakan dua buah arduino, yang mana satu sebagai master dan satu lagi sebagai slave. Karena pada SPI menggunaka mode transisi full duplex, pada bagian ini kedua master dan slave sama2 memberikan perintah kepada masing2 led yang ada. Jika button pada bagian slave ditekan, maka perintah yang masuk adalah 0, sehingga led pada bagian master akan menyala. Begitu pula sebaliknya.
Meskipun diberi resistor sebelum button sebesar 1k ohm, tidak mempengaruhi bagaimana keadaan dari LED, namun perubahan kecepatan pada penyalaan lednya akan melambat dari kondisi awal pada modul.
Selanjutnya, dimasukkan program ke simulino uno, yaitu:
//MASTER_Suci
#include<SPI.h> //Library for SPI
#define LED 7
#define ipbutton 2
int buttonvalue;
int x;
void setup (void)
{
Serial.begin(115200); //Starts Serial Communication at Baud Rate 115200
pinMode(ipbutton,INPUT); //Sets pin 2 as input
pinMode(LED,OUTPUT); //Sets pin 7 as Output
SPI.begin(); //Begins the SPI commnuication
SPI.setClockDivider(SPI_CLOCK_DIV8); //Sets clock for SPI communication at 8 (16/8=2Mhz)
digitalWrite(SS,HIGH); // Setting SlaveSelect as HIGH (So master doesnt connnect with slave)
}
void loop(void)
{
byte Mastersend,Mastereceive;
buttonvalue = digitalRead(ipbutton); //Reads the status of the pin 2
if(buttonvalue == HIGH) //Logic for Setting x value (To be sent to slave) depending upon input from pin 2
{
x = 1;
}
else
{
x = 0;
}
digitalWrite(SS, LOW); //Starts communication with Slave connected to master
Mastersend = x;
Mastereceive=SPI.transfer(Mastersend); //Send the mastersend value to slave also receives value from slave
if(Mastereceive == 1) //Logic for setting the LED output depending upon value received from slave
{
digitalWrite(LED,HIGH); //Sets pin 7 HIGH
Serial.println("Master LED ON");
}
else
{
digitalWrite(LED,LOW); //Sets pin 7 LOW
Serial.println("Master LED OFF");
}
delay(1000);
}
//SLAVE_Suci
//SPI SLAVE (ARDUINO)
//SPI COMMUNICATION BETWEEN TWO ARDUINO
//CIRCUIT DIGEST
//Pramoth.T
#include<SPI.h>
#define LEDpin 7
#define buttonpin 2
volatile boolean received;
volatile byte Slavereceived,Slavesend;
int buttonvalue;
int x;
void setup()
{
Serial.begin(115200);
pinMode(buttonpin,INPUT); // Setting pin 2 as INPUT
pinMode(LEDpin,OUTPUT); // Setting pin 7 as OUTPUT
pinMode(MISO,OUTPUT); //Sets MISO as OUTPUT (Have to Send data to Master IN
SPCR |= _BV(SPE); //Turn on SPI in Slave Mode
received = false;
SPI.attachInterrupt(); //Interuupt ON is set for SPI commnucation
}
ISR (SPI_STC_vect) //Inerrrput routine function
{
Slavereceived = SPDR; // Value received from master if store in variable slavereceived
received = true; //Sets received as True
}
void loop()
{ if(received) //Logic to SET LED ON OR OFF depending upon the value recerived from master
{
if (Slavereceived==1)
{
digitalWrite(LEDpin,HIGH); //Sets pin 7 as HIGH LED ON
Serial.println("Slave LED ON");
}else
{
digitalWrite(LEDpin,LOW); //Sets pin 7 as LOW LED OFF
Serial.println("Slave LED OFF");
}
buttonvalue = digitalRead(buttonpin); // Reads the status of the pin 2
if (buttonvalue == HIGH) //Logic to set the value of x to send to master
{
x=1;
}else
{
x=0;
}
Slavesend=x;
SPDR = Slavesend; //Sends the x value to master via SPDR
delay(1000);
}
}
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