Hey guys! New to the board and new to Arduino. Hoping someone can help me out here!
I'm building a guitar tremolo pedal, and I wanted to put an LCD display in to tell me how turned up or down the knobs/pots are so I can change the settings between songs and change them back exactly when I need to play songs again.
I'm essentially going for something like this:
So I put this schematic together (basically, each pot goes into a TL072 IC chip, which splits the signals for each lug, one goes into the arduino, one goes back to the pedal circuit) - you can see the original basic config for the pots above, and the new one below:
I would be buying this board:
http://www.amazon.com/SainSmart-Keypad-Shield-Arduino-ATmega328P/dp/B0076FWAH8/ref=sr_1_14?ie=UTF8&qid=1354491071&sr=8-14&keywords=arduino+lcd+shield
and I would be using this code:
// include the library code:
#include <LiquidCrystal.h>
// intialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int pot0 = A1; //potentiometer on analog pin 1
int pot1 = A2; //potentiometer on analog pin 2
int qty; //Quantity value to read
int length; //Length Value to read
void setup() {
// set up the LCD’s number of columns and rows
lcd.begin(16, 2);
}
void loop() {
qty = analogRead(pot0); //sets value equal to potentiometer “pot 0”
length = analogRead(pot1); //sets value equal to potentiometer “pot 1”
lcd.setCursor (0,0); //Set cursor to column 0, line 0 (line 0 is the first line)
lcd.print(”Length ”);
lcd.setCursor(10,0);
lcd.print(length);
lcd.print(” “);
lcd.setCursor (0,1); //Set cursor to column 0, line 1 (line 1 is the second line)
lcd.print(”Quantity ”);
lcd.setCursor(10,1);
lcd.print(qty);
lcd.print(” “);
}
Here are my concerns:
Can the TL074 chips handle the Arduino signal? Will this affect my signal from the pots to the circuit board? Do I need any kind of resistors between the arduino board and the IC?
I also worry about what I need to do to power the IC - right now I just run from the +9v to a 1n4001 diode and then to the power pin. Something tells me at least another cap is needed in there someplace, if not more.
The pots in question are part of the LFO, so they carry no audio signal, just FYI. I heard arduino is terrible with audio quality. These just affect the LED speed that hits the photoresistors in the trem circuit.
Anyone versed in this stuff enough to see if I'm on the right track?
Lemme know - and thanks in advance!