error compiling

i new arduino , programming, , have friend needs building arduino powered solenoid driver precisely control drops of kyoto-style cold coffee brewer, video of talking https://youtu.be/q5ww_9ztyge.  we got parts when tried upload program got error

/users/franciscofernandez/desktop/arduino/sketch_jul22a/sketch_jul22a.ino:2:31: fatal error: adafruit_mcp23017.h: no such file or directory
#include <adafruit_mcp23017.h>
                              ^
compilation terminated.
exit status 1
error compiling board arduino/genuino uno.

this code.......

code: [select]

#include <wire.h>
#include <adafruit_mcp23017.h>
#include <adafruit_rgblcdshield.h>
#include <adafruit_motorshield.h>
#include "utility/adafruit_pwmservodriver.h"
#include <servo.h>

// shield uses i2c scl , sda pins. on classic arduinos
// analog 4 , 5 can't use analogread() anymore
// however, can connect other i2c sensors i2c bus , share
// i2c bus.
adafruit_rgblcdshield lcd = adafruit_rgblcdshield();

// these #defines make easy set backlight color
#define red 0x1
#define yellow 0x3
#define green 0x2
#define teal 0x6
#define blue 0x4
#define violet 0x5
#define white 0x7

// create motor shield object default i2c address
adafruit_motorshield afms = adafruit_motorshield();

// connect stepper motor 200 steps per revolution (1.8 degree)
// motor port #2 (m3 , m4)
adafruit_steppermotor *mystepper = afms.getstepper(200, 2);
// , connect dc motors ports
adafruit_dcmotor *mymotor1 = afms.getmotor(1);
adafruit_dcmotor *mymotor2 = afms.getmotor(2);
adafruit_dcmotor *mymotor3 = afms.getmotor(3);
adafruit_dcmotor *mymotor4 = afms.getmotor(4);

int t_drop = 50;
int t_calib_1 = 0, t_calib_2 = 0;
int t_delay = 1000;
int t_enable = 0;

void runmotor(int motor) {
  if(motor == 1) {
    mymotor1->run(forward);
    mymotor3->run(forward);
  } else {
    mymotor2->run(forward);
    mymotor4->run(forward);
  }
}

void stopmotor(int motor) {
  if(motor == 1) {
    mymotor1->run(release);
    mymotor3->run(release);
  } else {
    mymotor2->run(release);
    mymotor4->run(release);
  }
}

void update() {
  lcd.clear();
  lcd.setcursor(0, 0);
  lcd.print("drop: ");
  lcd.print(t_drop);
  if(t_enable == 1) {
    lcd.print("+");
    lcd.print(t_calib_1);
  } else if(t_enable == 2) {
    lcd.print("+");
    lcd.print(t_calib_2);
  }
  lcd.print(" msec");
  lcd.setcursor(0, 1);
  lcd.print("rate: ");
  lcd.print(t_delay/500);
  lcd.print(".");
  lcd.print((t_delay/50)%10);
  lcd.print(" sec  ");
  lcd.print(t_enable);
}

void setup() {
  int i, test = 1;
  uint8_t button, button_last = 0;
  
  serial.begin(9600);           // set serial library @ 9600 bps
    
  // set lcd's number of columns , rows:
  lcd.begin(16, 2);
  lcd.setbacklight(white);
  
  afms.begin();  // create default frequency 1.6khz
  
  // turn on motor m1
  mymotor1->setspeed(255);
  mymotor1->run(release);
  mymotor2->setspeed(255);
  mymotor2->run(release);
  mymotor3->setspeed(255);
  mymotor3->run(release);
  mymotor4->setspeed(255);
  mymotor4->run(release);
  
  // wait max chip stabilize
  delay(500);

  if(lcd.readbuttons() == button_select) {
    lcd.clear();
    lcd.setcursor(0, 0);
    lcd.print("calibration");
    delay(2000);

    while(1) {
      while(1) {
        lcd.setcursor(0, 1);
        lcd.print("1=");
        lcd.print(t_calib_1);
        if(test == 1) lcd.print("*   ");
        else          lcd.print("    ");
        lcd.setcursor(8, 1);
        lcd.print("2=");
        lcd.print(t_calib_2);
        if(test == 2) lcd.print("*   ");
        else          lcd.print("    ");
          
        button = lcd.readbuttons();
        if(button != button_last) {
          if(button == button_right) {
            if(test == 1) test = 2;
            else          test = 1;
          }
          if(button == button_left) {
            for(i = 0; < 100; i++) {
               runmotor(test);
               delay(50 + ((test == 1) ? t_calib_1 : t_calib_2));
               stopmotor(test);
               delay(150);
            }
          }
          if(button == button_up) {
            if(test == 1) t_calib_1++;
            else          t_calib_2++;
          }
          if(button == button_down)
            if(test == 1) t_calib_1--;
            else          t_calib_2--;
          if(button == button_select)
            goto done;
        }
        button_last = button;
        delay(100);
      }
    }
  }
  
done:
  update();
}

int timer = 0, motor = 0;
void loop() {
  uint8_t buttons = lcd.readbuttons();
  static uint8_t buttons_last;
  
  if(buttons && (buttons != buttons_last)) {
    if(buttons & button_up) {
      if((t_enable == 3) || (t_enable == 0))
        t_drop += 10;
      else if(t_enable == 1)
        t_calib_1++;
      else if(t_enable == 2)
        t_calib_2++;
    }
    if(buttons & button_down) {
      if((t_enable == 3) || (t_enable == 0))
        t_drop -= 10;
      else if(t_enable == 1)
        t_calib_1--;
      else if(t_enable == 2)
        t_calib_2--;
    }
    if(buttons & button_right) {
      t_delay += 100;
    }
    if(buttons & button_left) {
      t_delay -= 100;
    }
    if(buttons & button_select) {
      if(!t_enable) t_enable = 3;
      else          t_enable--;
      stopmotor(1);
      stopmotor(2);
    }
    update();
    timer = 0;
  }
  buttons_last = buttons;
  
  if(timer == 0) {
    if(!motor && (t_enable & 1)) {
      runmotor(1);
      delay(t_drop + t_calib_1);
      stopmotor(1);
      timer += t_drop + t_calib_1;
    } else if(motor && (t_enable & 2)) {
      runmotor(2);
      delay(t_drop + t_calib_2);
      stopmotor(2);
      timer += t_drop + t_calib_1;
    }
  }
  
  delay(8);
  timer += 10;
  
  if(timer >= t_delay) {
    timer = 0;
    motor++;
    motor &= 1;
  }
}

have downloaded , installed "adafruit_mcp23017" library?

incidentally, don't post code inline. please use [code]// code tags[/code].

you can select code press </> button in edit window.

also, don't add characters '+' have @ start of each line. wanting copy code , paste ide testing has manually remove each , every '+' before can test code.

(it's not late edit post , make these corrections;) )

edit: library here:- adafruit-mcp23017-arduino-library

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