AnnaLouise Martinez / Mbed 2 deprecated lightsense_kl46z_basic

led light on and off using light sensor

Dependencies:   SLCD mbed

Fork of lightsense_kl46z_basic by Stanley Cohen

main.cpp@6:710e18c552f5, 2014-09-14 (annotated)

Committer:
scohennm
Date:
Sun Sep 14 23:45:39 2014 +0000
Revision:
6:710e18c552f5
Parent:
5:817aa144563d
Child:
7:8d7089b514ae
Example of using visible light sensor and LCD display. LEDs showing high and low limits.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
scohennm 0:e23fffd4b9a7 1 #include "mbed.h"
scohennm 1:51f8c2b04ce2 2 #include "SLCD.h"
scohennm 1:51f8c2b04ce2 3
scohennm 3:64e28ee5719b 4
scohennm 6:710e18c552f5 5 // An State Machine solution to HW 4.1 Q3
scohennm 6:710e18c552f5 6 // using wait() for high and low limits.
scohennm 1:51f8c2b04ce2 7 //#define PRINTDEBUG
scohennm 6:710e18c552f5 8 #define PROGNAME "blink_kl46z_states v2\n\r"
scohennm 0:e23fffd4b9a7 9 #define LEDON false
scohennm 0:e23fffd4b9a7 10 #define LEDOFF true
scohennm 5:817aa144563d 11 #define LEDTMESS "TRUE"
scohennm 5:817aa144563d 12 #define LEDFMESS "FALS"
scohennm 5:817aa144563d 13 #define BLINKDWELL 400 // milliseconds
scohennm 1:51f8c2b04ce2 14 #define DFDELTA 0.01
scohennm 1:51f8c2b04ce2 15 #define PWMTIME 1 // ms (kHz
scohennm 1:51f8c2b04ce2 16 #define LCDLEN 10
scohennm 1:51f8c2b04ce2 17 #define NUMSTATES 2
scohennm 6:710e18c552f5 18 #define LOWLIMIT 0.1
scohennm 6:710e18c552f5 19 #define HILIMIT 0.85
scohennm 6:710e18c552f5 20 #define ONTIME 1.0
scohennm 6:710e18c552f5 21
scohennm 6:710e18c552f5 22
scohennm 6:710e18c552f5 23 enum blinkStates {IDLESTATE, NEWBLINK, LOWLITE, HILITE}; // define the states
scohennm 0:e23fffd4b9a7 24
scohennm 5:817aa144563d 25 char logicalString [NUMSTATES][LCDLEN] = {LEDFMESS, LEDTMESS};
scohennm 4:bd42ab18979b 26 SLCD slcd; //define LCD display globally define
scohennm 1:51f8c2b04ce2 27 Serial pc(USBTX, USBRX);
scohennm 1:51f8c2b04ce2 28
scohennm 1:51f8c2b04ce2 29 void LCDMess(char *lMess){
scohennm 1:51f8c2b04ce2 30 slcd.Home();
scohennm 1:51f8c2b04ce2 31 slcd.clear();
scohennm 1:51f8c2b04ce2 32 slcd.printf(lMess);
scohennm 1:51f8c2b04ce2 33 }
scohennm 0:e23fffd4b9a7 34
scohennm 0:e23fffd4b9a7 35 int main() {
scohennm 5:817aa144563d 36 DigitalOut greenColor(LED_GREEN);
scohennm 5:817aa144563d 37 DigitalOut redColor(LED_RED);
scohennm 6:710e18c552f5 38 AnalogIn LightSensor(PTE22);
scohennm 6:710e18c552f5 39 float lightData;
scohennm 1:51f8c2b04ce2 40 char lcdData[LCDLEN];
scohennm 4:bd42ab18979b 41 Timer LEDTimer; // time till next PWM values is to change.
scohennm 6:710e18c552f5 42 blinkStates PGMState = IDLESTATE; // work till timer transitions
scohennm 5:817aa144563d 43 int ledState = LEDON;
scohennm 5:817aa144563d 44
scohennm 4:bd42ab18979b 45
scohennm 5:817aa144563d 46 int timeToChangeDF = BLINKDWELL;
scohennm 3:64e28ee5719b 47 // set up timer for next step of Duty Factor timing
scohennm 3:64e28ee5719b 48 LEDTimer.start();
scohennm 3:64e28ee5719b 49 LEDTimer.reset();
scohennm 1:51f8c2b04ce2 50 pc.printf(PROGNAME);
scohennm 1:51f8c2b04ce2 51
scohennm 3:64e28ee5719b 52
scohennm 4:bd42ab18979b 53
scohennm 0:e23fffd4b9a7 54 while(true) {
scohennm 5:817aa144563d 55 switch (PGMState){
scohennm 4:bd42ab18979b 56 case IDLESTATE: {
scohennm 4:bd42ab18979b 57 if (LEDTimer.read_ms() > timeToChangeDF){ // check for timer time out transtion
scohennm 6:710e18c552f5 58 lightData = (1.0 - LightSensor.read());
scohennm 6:710e18c552f5 59 sprintf(lcdData,"%4.3f",lightData);
scohennm 6:710e18c552f5 60 LCDMess(lcdData);
scohennm 6:710e18c552f5 61 if (lightData < LOWLIMIT){ // find appropriate state
scohennm 6:710e18c552f5 62 PGMState = LOWLITE;
scohennm 6:710e18c552f5 63 } else if (lightData > HILIMIT){
scohennm 6:710e18c552f5 64 PGMState = HILITE;
scohennm 6:710e18c552f5 65 } else {
scohennm 6:710e18c552f5 66 PGMState = NEWBLINK;
scohennm 6:710e18c552f5 67 }
scohennm 6:710e18c552f5 68
scohennm 6:710e18c552f5 69 }
scohennm 4:bd42ab18979b 70 break;
scohennm 4:bd42ab18979b 71 }
scohennm 5:817aa144563d 72 case NEWBLINK: {
scohennm 5:817aa144563d 73 ledState = !ledState;
scohennm 6:710e18c552f5 74 redColor.write(ledState);
scohennm 6:710e18c552f5 75 greenColor.write(!ledState);
scohennm 6:710e18c552f5 76 // create string for display on LCD
scohennm 6:710e18c552f5 77
scohennm 6:710e18c552f5 78 LEDTimer.reset(); // reset the timer
scohennm 6:710e18c552f5 79 PGMState = IDLESTATE; // go idle state
scohennm 6:710e18c552f5 80 break;
scohennm 6:710e18c552f5 81 }
scohennm 6:710e18c552f5 82 case HILITE: {
scohennm 6:710e18c552f5 83 redColor.write(LEDON);
scohennm 6:710e18c552f5 84 greenColor.write(LEDOFF);
scohennm 6:710e18c552f5 85 // create string for display on LCD
scohennm 6:710e18c552f5 86 wait(ONTIME);
scohennm 6:710e18c552f5 87 LEDTimer.reset(); // reset the timer
scohennm 6:710e18c552f5 88 PGMState = IDLESTATE; // go idle state
scohennm 6:710e18c552f5 89 break;
scohennm 6:710e18c552f5 90 }
scohennm 6:710e18c552f5 91 case LOWLITE: {
scohennm 6:710e18c552f5 92 redColor.write(LEDOFF);
scohennm 6:710e18c552f5 93 greenColor.write(LEDON);
scohennm 6:710e18c552f5 94 // create string for display on LCD
scohennm 6:710e18c552f5 95 wait(ONTIME);
scohennm 4:bd42ab18979b 96 LEDTimer.reset(); // reset the timer
scohennm 5:817aa144563d 97 PGMState = IDLESTATE; // go idle state
scohennm 4:bd42ab18979b 98 break;
scohennm 4:bd42ab18979b 99 }
scohennm 4:bd42ab18979b 100 } // end state machine
scohennm 4:bd42ab18979b 101
scohennm 1:51f8c2b04ce2 102 #ifdef PRINTDEBUG
scohennm 1:51f8c2b04ce2 103 pc.printf("i= %d dutyfactor = %5.4f workingDelta %5.4f \n\r", i, dutyFactor, workingDelta);
scohennm 1:51f8c2b04ce2 104 #endif
scohennm 4:bd42ab18979b 105 }// emd while
scohennm 4:bd42ab18979b 106 }