PSoC™ 6: Voice Controlled Stove with Edge AI

XIn8zpxLsfsdfsadVmTTiPxze+v1A3ESyCdfsdfsdhXXrWwOKS0orK1VtQK6kg==

static const char* ACCESS_KEY = "XIn8zpxLsfsdfsadVmTTiPxze+v1A3ESyCdfsdfsdhXXrWwOKS0orK1VtQK6kg==";

(polite word) @Macro(i.e. Verb/Action) (article words) $Slot(i.e. Noun/Variables)
   Please                    Start             the                 Burner
   Can you                   Set Timer         to                  Five Minutes?

(please) @Start (the) $Flame:Flame

"Hey Stove, start the fire"
"Hey Stove, turn on the flame"
"Hey Stove, activate the burner"

"Hey Stove, change gas to 40%"
"Hey Stove, increase flame to 65%"
"Hey Stove, reduce gas to 25%"

"Hey Stove, set timer to 1 minute"
"Hey Stove, change timer to 5 minutes"

//// Please check licensing Info at the end of void main ////

// Necessary Header files //
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

#include "cy_rgb_led.h"
#include "cy_pdl.h"
#include "cyhal.h"
#include "cycfg.h"
#include "cybsp.h"
#include "pv_audio_rec.h"
#include "pv_keywords.h"
#include "pv_picovoice.h"
#include "pv_psoc6.h"

#define MEMORY_BUFFER_SIZE (70 * 1024)

// Please Create an account in Picovoice.ai and get your own unique access_key and replace the
// following string with Your ACCCESS_KEY
// This is a dummy access_key, paste your access kye in this format: "Access_Key";
static const char* ACCESS_KEY ="XIn8zpxLMYGVmTTiPxze+v1A3ESyChXXrWwOKUGoFS0orK1VtQK6kg==";
static int8_t memory_buffer[MEMORY_BUFFER_SIZE] __attribute__((aligned(16)));

// Change these values slightly if you need more sensitivity,
// But increasing sensitivity will reduce selectivity, Range : 0.0f - 1.0f
static const float PORCUPINE_SENSITIVITY = 0.75f;
static const float RHINO_SENSITIVITY = 0.5f;


//////////////////////////////////////////////////////
//////////////////////////////////////////////////////
// PWM Frequency = 50Hz //
#define PWM_FREQUENCY (50u)
// PWM Output Pins for servo control //
#define PWM_PIN_VALVE_CTRL P0_3
#define PWM_PIN_PEIZO_CTRL P1_3
// PWM Duty-cycle = 10% //
float PEIZO_CTRL_PWM_DUTY_CYCLE = 10.0f;
float VALVE_CTRL_PWM_DUTY_CYCLE = 10.0f;
///////////////////////////////////////////////////////
cyhal_pwm_t pwm_servo_signal_peizo_ctrl;
cyhal_pwm_t pwm_servo_signal_valve_ctrl;
///////////////////////////////////////////////////////
float servo_last_position = 0.0f; // 0 position of servo
///LowPower Timer will be used for Cooking Timer purpose///
cyhal_lptimer_t lptimer_obj;
cyhal_lptimer_info_t lptimer_obj_info;
uint32_t timer_start_cnt = 0; // lp timer count for starting cooking timer
uint32_t timer_stop_cnt = 0; // lp timer count for stopping cooking timer
uint32_t timer_duration = 0; // in minute(s)
timer_en = 0; // cooking timer active/inactive flag

////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////


//This function will take an angle (0-180) and
//drive one of the servo to that position

void set_servo_position (float angle)
{
    // Initialize the PWM //
    __enable_irq();
     cyhal_pwm_init(&pwm_servo_signal_valve_ctrl, PWM_PIN_VALVE_CTRL, NULL);
    //Set the PWM output frequency and duty cycle */
    cyhal_pwm_set_duty_cycle(&pwm_servo_signal_valve_ctrl, VALVE_CTRL_PWM_DUTY_CYCLE, PWM_FREQUENCY);
    // Start the PWM //
     cyhal_pwm_start(&pwm_servo_signal_valve_ctrl);
     float angle_difference = angle - servo_last_position;
    ///////////////////////////////////////////////////////////////////
     // for cw servo rotation (ccw valve opening more - more gas flow)
     if (angle_difference>0.0f)
 	{
 	    // (scaling: 180.0 degrees / 10.0 % duty = 18.0)
    	float steps = angle_difference/18.0f;
    	float position_reference = servo_last_position/18.0f;
    		while(VALVE_CTRL_PWM_DUTY_CYCLE  >= 10.0f - steps - position_reference)
    		{
    		VALVE_CTRL_PWM_DUTY_CYCLE = VALVE_CTRL_PWM_DUTY_CYCLE - 0.05;
 	    	cyhal_pwm_set_duty_cycle(&pwm_servo_signal_valve_ctrl, VALVE_CTRL_PWM_DUTY_CYCLE, PWM_FREQUENCY);
 	    	Cy_SysLib_Delay(25);
   	        // duty cycle limit
 	    	//if (PWM_DUTY_CYCLE > 10.0f) PWM_DUTY_CYCLE = 10.0f;
 	        // if (PWM_DUTY_CYCLE < 0.0f) PWM_DUTY_CYCLE = 0.0f;

    		}
 	}
 ///////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////
 // for ccw servo rotation (cw valve closing more - less gas flow)
     if (angle_difference<=0.0f)
      	{
         	float steps = angle_difference/18.0f;
        	float position_reference = servo_last_position/18.0f;
         		while(VALVE_CTRL_PWM_DUTY_CYCLE <= 10.0f - steps - position_reference)
         		{
         			VALVE_CTRL_PWM_DUTY_CYCLE = VALVE_CTRL_PWM_DUTY_CYCLE + 0.05;
      	    	cyhal_pwm_set_duty_cycle(&pwm_servo_signal_valve_ctrl, VALVE_CTRL_PWM_DUTY_CYCLE, PWM_FREQUENCY);
      	    	Cy_SysLib_Delay(25);

      	    	//if (PWM_DUTY_CYCLE > 10.0f) PWM_DUTY_CYCLE = 10.0f;
      	        //if (PWM_DUTY_CYCLE < 0.0f) PWM_DUTY_CYCLE = 0.0f;


         		}
      	}
///////////////////////////////////////////////////////////////////////////

     servo_last_position = angle;
     // some delay may be needed
    // turn off pwm signal //
	cyhal_pwm_free(&pwm_servo_signal_valve_ctrl);

}
////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////

//This function controls the other servo motor to activate the peizo ignition lever
	void operate_servo_peizo_ignition (void)
	{
	   // Initialize the PWM //
	   __enable_irq();
	     cyhal_pwm_init(&pwm_servo_signal_peizo_ctrl, PWM_PIN_PEIZO_CTRL, NULL);
	  // Set the PWM output frequency and duty cycle */
	     cyhal_pwm_set_duty_cycle(&pwm_servo_signal_peizo_ctrl, PEIZO_CTRL_PWM_DUTY_CYCLE, PWM_FREQUENCY);
	  // Start the PWM //
	     cyhal_pwm_start(&pwm_servo_signal_peizo_ctrl);
      // move servo motor 1 to pull the lever of peizo igniter spark generator

	 	while(PEIZO_CTRL_PWM_DUTY_CYCLE >= 0.0f)
	 	{
	 	PEIZO_CTRL_PWM_DUTY_CYCLE = PEIZO_CTRL_PWM_DUTY_CYCLE - 0.1;
	 	cyhal_pwm_set_duty_cycle(&pwm_servo_signal_peizo_ctrl, PEIZO_CTRL_PWM_DUTY_CYCLE, PWM_FREQUENCY);
	 	Cy_SysLib_Delay(25);
	 	}
	    while(PEIZO_CTRL_PWM_DUTY_CYCLE <=10.0f)
		{
	    PEIZO_CTRL_PWM_DUTY_CYCLE = PEIZO_CTRL_PWM_DUTY_CYCLE + 0.1;
		cyhal_pwm_set_duty_cycle(&pwm_servo_signal_peizo_ctrl, PEIZO_CTRL_PWM_DUTY_CYCLE, PWM_FREQUENCY);
		Cy_SysLib_Delay(25);
		}


		PEIZO_CTRL_PWM_DUTY_CYCLE = 10.0f;
		// turn of pwm signal
		cyhal_pwm_free(&pwm_servo_signal_peizo_ctrl);

	}

////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////


// convert percent value from string to integer, in step of 5, range: 10-100
// for example this string "forty percent" will return 40,
int get_percent (char *pv_value)
{
	int i = 30; //default value for wrong input

	if (!(strcmp(pv_value, "ten percent")))
			{i = 10;}
	if (!(strcmp(pv_value, "fifteen percent")))
		  {i = 15;}
	if (!(strcmp(pv_value, "twenty percent")))
			{i = 20;}
	if (!(strcmp(pv_value, "twenty five percent")))
			{i = 25;}
	if (!(strcmp(pv_value, "thirty percent")))
			{i = 30;}
	if (!(strcmp(pv_value, "thirty five percent")))
			{i = 35;}
	if (!(strcmp(pv_value, "forty percent")))
			{i = 40;}
	if (!(strcmp(pv_value, "forty five percent")))
			{i = 45;}
	if (!(strcmp(pv_value, "fifty percent")))
	    {i = 50;}
	if (!(strcmp(pv_value, "fifty five percent")))
		  {i = 55;}
	if (!(strcmp(pv_value, "sixty percent")))
			{i = 60;}
	if (!(strcmp(pv_value, "sixty five percent")))
			{i = 65;}
	if (!(strcmp(pv_value, "seventy percent")))
			{i = 70;}
	if (!(strcmp(pv_value, "seventy five percent")))
			{i = 75;}
	if (!(strcmp(pv_value, "eighty percent")))
			{i = 80;}
	if (!(strcmp(pv_value, "eighty five percent")))
			{i = 85;}
	if (!(strcmp(pv_value, "ninety percent")))
			{i = 90;}
	if (!(strcmp(pv_value, "ninety five percent")))
			{i = 95;}
	if (!(strcmp(pv_value, "hundred percent")))
	    {i = 100;}
	return i;
}

/////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////

///// Convert Voice Command for Cooking Timer into integer //////
// Valid timer setting are 1,2,3,5,10,15,20,25,30 minutes only //

int get_timer_duration (char *minutes)
{
	int m = 1;

	if (!(strcmp(minutes, "One Minute")))
				{m = 1;}
	if (!(strcmp(minutes, "Two Minutes")))
				{m = 2;}
  if (!(strcmp(minutes, "Three Minutes")))
				{m = 3;}
	if (!(strcmp(minutes, "Five Minutes")))
				{m = 5;}
	if (!(strcmp(minutes, "Ten Minutes")))
				{m = 10;}
	if (!(strcmp(minutes, "Fifteen Minutes")))
				{m = 15;}
	if (!(strcmp(minutes, "Twenty Minutes")))
				{m = 20;}
	if (!(strcmp(minutes, "Twenty Five Minutes")))
				{m = 25;}
	if (!(strcmp(minutes, "Thirty Minutes")))
				{m = 30;}


	return m;
}

//////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////

void check_if_timer_expired(void)
{
	cyhal_lptimer_get_info(&lptimer_obj, &lptimer_obj_info);
	uint32_t timeout_val = timer_start_cnt + timer_duration*60*(unsigned long)lptimer_obj_info.frequency_hz;
    timer_stop_cnt = cyhal_lptimer_read(&lptimer_obj);
    if(timer_stop_cnt>timeout_val)
    {
    	// duration of cooking timer has elapsed
    	// Turn off the stove/flame/gas
        set_servo_position(0.0f); // Fully Close Gas Valve
        // acknowledge shutdown cmd with voice playback
        printf("006"); printf("\r\n");
        timer_en = 0;
        cyhal_lptimer_free(&lptimer_obj);
    }

}

/////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////


// glows on board green LED when wake word "Hey Stove" is said
static void wake_word_callback(void)
{
    cy_rgb_led_on(CY_RGB_LED_COLOR_GREEN, CY_RGB_LED_MAX_BRIGHTNESS);
}

// This is the core function to extract Intent from Inference //
// I have added my own code by modifying the original function //
// Original code provided by Picovoice //

/////////////////// Important note /////////////////////
/* printf() is used to send voice playback commands from
   PSoC6 to Beetle over half duplex UART line,
   after receiving each command a specific file on
   voice playback module is selected by Bettle board
   for playing appropriate mp3 file
   This is how the Interactive Voice UI works !
*/
/////////////////////////////////////////////////////////

static void inference_callback(pv_inference_t *inference)
{
    cy_rgb_led_on(CY_RGB_LED_COLOR_BLUE, CY_RGB_LED_MAX_BRIGHTNESS);

/////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////
    if (!(inference->is_understood))
    {
   // "Intent not understood please say again" - msg playback
    	printf("014"); printf("\r\n");
    }
/////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////
        // if there is a valid intent
    if (inference->is_understood)
    {
 // identify the intent and execute necessary hardware actions
//////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////
    	if(!(strcmp(inference->intent, "StartBurner")))
    	{
    		// " All right" - msg playback
    		printf("002"); printf("\r\n");
    		// Turn on the stove/open gas valve + ignite fire
    		set_servo_position(10.0f); // Partially Open Gas Valve
      		Cy_SysLib_Delay(200);
    		operate_servo_peizo_ignition(); // Ignite fire with Spark
    		Cy_SysLib_Delay(500);

    		// Voice Playback  //
            // Flame sensing/ gas sensing here (later) //
    		// "Flame Ignition Successful" - msg playback
    		printf("003"); printf("\r\n");
    		Cy_SysLib_Delay(900);

    	}

///////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////
    	if (!(strcmp(inference->intent,"StopBurner")))
    	{
    		// Turn off the stove/flame/gas
    		set_servo_position(0.0f); // Fully Close Gas Valve
            // "Turning off Now" msg playback
    		printf("006"); printf("\r\n");

    	}
///////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////
    	if(!(strcmp(inference->intent, "SetTimer")))
    	{
    		timer_duration = get_timer_duration(inference->values[0]);
    		//printf("%d",timer_duration);
    		timer_en = 1; // timer enable indication flag
    		cyhal_lptimer_init(&lptimer_obj); // start low power timer
    		timer_start_cnt = cyhal_lptimer_read(&lptimer_obj);
    		// "Timer has been set" -msg playback
    		printf("007"); printf("\r\n");

    	}
///////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////
    	if (!(strcmp(inference->intent, "SetFlame")))
    	{
        // Increase/decrease gas flow to adjust flame
    		int gas_valve = get_percent(inference->values[1]);
    	// scaling: half of (180 degree/100 percent) = 0.9f
            float valve_pos = gas_valve*0.9f;
            set_servo_position(valve_pos);

        // convert integer to string (for gas/flame level)
    		   char num2str[2];
    		   char padding[3]="0";
    		   sprintf(num2str, "%d", gas_valve);
    		   strcat(padding,num2str);

        // Voice msg playback confirms user's input for flame/gas adjustment
    		printf("004"); printf("\r\n");
    	    Cy_SysLib_Delay(2400);
    	    printf("%s",padding); printf("\r\n");
    	    Cy_SysLib_Delay(2500);
    		printf("005"); printf("\r\n");
    		Cy_SysLib_Delay(900);
 ///////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////


    	}
    }


    for (int32_t i = 0; i < 10; i++) {
        if (cy_rgb_led_get_brightness() == 0) {
            cy_rgb_led_set_brightness(CY_RGB_LED_MAX_BRIGHTNESS);
        } else {
            cy_rgb_led_set_brightness(0);
        }
        Cy_SysLib_Delay(30);
    }
    cy_rgb_led_off();

    pv_inference_delete(inference);
}


/*static void error_handler(void) {
    while(true);
}*/


///////////////////// VOID MAIN ///////////////////
///////////////////////////////////////////////////

int main(void) {

	// necessary initializations for picovoice to work properly

    pv_board_init();
    pv_message_init();


// Use the following code if you need to know the UUID of your Board //
// UUID will be needed every time you create a new AI model on picovoice.ai //
/*
    const uint8_t *board_uuid = pv_get_uuid();
    printf("UUID: ");
    for (uint32_t i = 0; i < pv_get_uuid_size(); i++) {
        printf(" %.2x", board_uuid[i]);
    }
    printf("\r\n");
*/
// Initialize audio and start listening for user voice input //
    pv_audio_rec_init();
    pv_audio_rec_start();
    pv_picovoice_t *handle = NULL;
    pv_picovoice_init(ACCESS_KEY,
            MEMORY_BUFFER_SIZE,
            memory_buffer,
            sizeof(KEYWORD_ARRAY),
            KEYWORD_ARRAY,
            PORCUPINE_SENSITIVITY,
            wake_word_callback,
            sizeof(CONTEXT_ARRAY),
            CONTEXT_ARRAY,
            RHINO_SENSITIVITY,
            true,
            inference_callback,
            &handle);

// keep listening and if there is something meaningful,
// process it with picovoice AI engine
    while (true) {
        const int16_t *buffer = pv_audio_rec_get_new_buffer();
        if (buffer) {
             pv_picovoice_process(handle, buffer);

        }
///////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////
        if (timer_en == 1)
        {
        	// while cooking timer is running, check if the timer has timed out
        	check_if_timer_expired();
        }
///////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////

    }

    // should never reach here, just in case
    pv_board_deinit();
    pv_audio_rec_deinit();
    pv_picovoice_delete(handle);
}

//////////////////////// END_OF_MAIN ////////////////////////

///////////////////////Licensing Info////////////////////////
/////////////////////////////////////////////////////////////
////////////////// For Picovoice Code ///////////////////////
/*
    Copyright 2021 Picovoice Inc.

    You may not use this file except in compliance with the license. A copy of the license is located in the "LICENSE"
    file accompanying this source.

    Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
    an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
    specific language governing permissions and limitations under the License.
*/

////////////////// For Infenion/Cypress Code ////////////////
/*******************************************************************************
* Copyright 2020-2021, Cypress Semiconductor Corporation (an Infineon company) or
* an affiliate of Cypress Semiconductor Corporation.  All rights reserved.
*
* This software, including source code, documentation and related
* materials ("Software") is owned by Cypress Semiconductor Corporation
* or one of its affiliates ("Cypress") and is protected by and subject to
* worldwide patent protection (United States and foreign),
* United States copyright laws and international treaty provisions.
* Therefore, you may use this Software only as provided in the license
* agreement accompanying the software package from which you
* obtained this Software ("EULA").
* If no EULA applies, Cypress hereby grants you a personal, non-exclusive,
* non-transferable license to copy, modify, and compile the Software
* source code solely for use in connection with Cypress's
* integrated circuit products.  Any reproduction, modification, translation,
* compilation, or representation of this Software except as specified
* above is prohibited without the express written permission of Cypress.
*
* Disclaimer: THIS SOFTWARE IS PROVIDED AS-IS, WITH NO WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, NONINFRINGEMENT, IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress
* reserves the right to make changes to the Software without notice. Cypress
* does not assume any liability arising out of the application or use of the
* Software or any product or circuit described in the Software. Cypress does
* not authorize its products for use in any products where a malfunction or
* failure of the Cypress product may reasonably be expected to result in
* significant property damage, injury or death ("High Risk Product"). By
* including Cypress's product in a High Risk Product, the manufacturer
* of such system or application assumes all risk of such use and in doing
* so agrees to indemnify Cypress against all liability.
*******************************************************************************/

////////////////// For my code //////////////////////////////
/* Most of my codes are inserted with in double slash lines
 *
 *
 */
///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////

////////////// (probably my codes, mostly !) //////////////////

///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////
/////////// Do whatever you want with my part of codes ////////
///////////        No credit needed for my code        ////////
// but please follow Picovoice and Infenion terms of License //
///////////////////////////////////////////////////////////////
//////////////////// End of Magic Spells //////////////////////

#include "U8glib.h"
#include <DFRobot_DF1101S.h>
#include <SoftwareSerial.h>

SoftwareSerial df1101sSerial(10, 11);          // RX = 10  TX = 11
SoftwareSerial PSoC6Serial(9, A1);          // RX = 9  TX = A1

U8GLIB_SSD1306_128X32 u8g(U8G_I2C_OPT_NONE);   // SCL = 2  SDA = 3

DFRobot_DF1101S df1101s;

#define BUTTON_DEC    A2
//#define BUTTON_INC     1 // Button disabled for serial port purpose (won't worry !)
#define BUTTON_SEL    A0

//#define OUTPUT_PIN1   0 // Output disabled for serial port usage 
#define OUTPUT_PIN2   A1
#define OUTPUT_PIN3   9

#define BLUE_LED      13

/////////////////////////

// record more mp3 and add more defines like this
// if device needs to say something through speaker

//////////////////////////////////////////////////


int number_index = 3;
int volume = 30;
long last_millis;

void setup(void)
{
 
 u8g.setRot90();        // change oled display orientation

 // set GPIOs for buttons and LED
 
 pinMode(BUTTON_DEC, INPUT_PULLUP);
 //pinMode(BUTTON_INC, INPUT_PULLUP);
 pinMode(BUTTON_SEL, INPUT_PULLUP);
 pinMode(BLUE_LED, OUTPUT);

 //  Output pins for controlling something
 //pinMode(OUTPUT_PIN1, OUTPUT); digitalWrite(OUTPUT_PIN1,LOW);
 pinMode(OUTPUT_PIN2, OUTPUT); digitalWrite(OUTPUT_PIN2,LOW);
 
 // welcome message  
 update_display_message_0();
 delay(500);

 // init soft serial to communicate with voice playback moduel
 
  df1101sSerial.begin(115200);
  delay(100);
  while(!df1101s.begin(df1101sSerial))
  {
 // update_display_message_1();  
  df1101s.setPrompt(false);  
  }

  //Set initial volume to 10
  df1101s.setVol(volume);

  // set playback mode
  df1101s.switchFunction(df1101s.MUSIC);

  // fast blink LED on pin 13
  for(int i = 0; i<10; i++)
  {debounce_blinky();}

   
  // init soft serial to half duplex to rcv cmd from PSoC6
  
  PSoC6Serial.begin(115200);
   
 
 // adjust volume with buttons
 // BUTTON_SEL for selecting shown value
 // BUTTON_INC for increasing shown value
 // BUTTON_DEC for decreasing shown value
 

for(int i = 0; i<10; i++)
{debounce_blinky();}

// set mp3 playback as single cycle
df1101s.setPlayMode(df1101s.SINGLECYCLE);  
 
}

void loop()
{


while(true)
{
if (PSoC6Serial.available())
{
  char incoming_cmd[3]= "000";
  PSoC6Serial.readBytes(incoming_cmd, 3);
  int playback_index = atoi(incoming_cmd);
  df1101s.playSpecFile(incoming_cmd);  
//  Serial.print(incoming_cmd);
}


}

// control fire starter circuit
//trigger_event();

 
} // end of loop

///////////////////////////////////
///control and display functions///
///////////////////////////////////

void update_display_message_0(void)
{    
  u8g.firstPage();  
  do {
     u8g.setFont(u8g_font_6x12); 
     u8g.drawStr( 0, 10, "say");
     u8g.drawStr( 0, 25, "wake");
     u8g.drawStr( 0, 40, "word");
     u8g.drawStr( 0, 55, "====");
     u8g.drawStr( 0, 70, "HEY");
     u8g.drawStr( 0, 85, "stove");
     
  } while( u8g.nextPage() );
}


void debounce_blinky(void)
{
  digitalWrite(BLUE_LED,HIGH);
  delay(25);  
  digitalWrite(BLUE_LED,LOW);
  delay(25);

}