Hi,
I’m very VERY new to arduino and programming in general.
I am hoping to be able to write code for a digital potentiometer MCP41010 (for prototype) and possibly AD5262 at a later time using SPI.
I was hoping the DIGIPOT could be controlled with buttons as opposed to just running it’s course, and once i can do that i am hoping to control that fucntion remotely via either Infra-red remote or just a bluetooth from a phone or something.
I have applied the below code just to test MCP41010 and it worked (unsurprisingly since i did not write it):
int CS_signal = 2; // Chip Select signal onsul pin 2 of Arduino
int CLK_signal = 4; // Clock signal on pin 4 of Arduino
int MOSI_signal = 5; // MOSI signal on pin 5 of Arduino
byte cmd_byte2 = B00010001 ; // Command byte
int initial_value = 100; // Setting up the initial value
void initialize() { // send the command byte of value 100 (initial value)
spi_out(CS_signal, cmd_byte2, initial_value);
}
void spi_out(int CS, byte cmd_byte, byte data_byte){ // we need this function to send command byte and data byte to the chip
digitalWrite (CS, LOW); // to start the transmission, the chip select must be low
spi_transfer(cmd_byte); // invio il COMMAND BYTE
delay(2);
spi_transfer(data_byte); // invio il DATA BYTE
delay(2);
digitalWrite(CS, HIGH); // to stop the transmission, the chip select must be high
}
void spi_transfer(byte working) {
for(int i = 1; i <= 8; i++) { // Set up a loop of 8 iterations (8 bits in a byte)
if (working > 127) {
digitalWrite (MOSI_signal,HIGH) ; // If the MSB is a 1 then set MOSI high
} else {
digitalWrite (MOSI_signal, LOW) ; } // If the MSB is a 0 then set MOSI low
digitalWrite (CLK_signal,HIGH) ; // Pulse the CLK_signal high
working = working << 1 ; // Bit-shift the working byte
digitalWrite(CLK_signal,LOW) ; // Pulse the CLK_signal low
}
}
void setup() {
pinMode (CS_signal, OUTPUT);
pinMode (CLK_signal, OUTPUT);
pinMode (MOSI_signal, OUTPUT);
initialize();
Serial.begin(9600); // setting the serial speed
Serial.println("ready!");
}
void loop() {
for (int i = 0; i < 255; i++) {
spi_out(CS_signal, cmd_byte2, i);
Serial.println(i); delay(10);
}
for (int i = 255; i > 0; --i) {
spi_out(CS_signal, cmd_byte2, i);
Serial.println(i);
delay(10);
}
}
I have tried to just logically deduce how to write code from this and am afraid i have failed. I hypothesise that the for loop is all i would have to adapt but am struggling to find things immediately relevant.
Could someone possibly point me in the right direction for what i’ll need to make the adaptations? thanks
