Nick Zhao
Smart LED window to mimic the sun
Diff: main.cpp
- Revision:
- 0:53cb5d7e5c36
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sun Dec 08 21:28:41 2019 +0000
@@ -0,0 +1,217 @@
+#include "mbed.h"
+#include <PwmOut.h>
+// **I/O INITIALIZATION**
+Serial pc(USBTX, USBRX); // tx, rx for Serial Port (Debugging)
+Serial Blue(p28,p27); // Bluetooh Initialization
+PwmOut bLED(p21); // Blue LEDS PWM pin assignment
+PwmOut rLED(p23); // Red LEDS PWM pin assignment
+AnalogIn bSliderIn(p20); // Slider in for blue
+AnalogIn rSliderIn(p19); // Slider in for red
+
+// **GLOBAL VARIABLES**
+int mode = 0; //Mode 0 = bluetooth; Mode 1 = slider; Mode 2 = RTC
+// These percentages are based off 0-100,
+// They do not correleate linearly with direct PwmOut.
+int bPercent=0;
+int rPercent=0;
+
+// **BLUETOOTH**
+// Variables
+volatile bool button_ready = 0;
+volatile int bnum = 0;
+volatile int bhit =0;
+// State used to remember previous characters read in a button message
+enum statetype {start = 0, got_exclm, got_B, got_num, got_hit};
+statetype state = start;
+// Interrupt routine to parse message with one new character per serial RX interrupt
+void parse_message()
+{
+ switch (state) {
+ case start:
+ if (Blue.getc()=='!') state = got_exclm;
+ else state = start;
+ break;
+ case got_exclm:
+ if (Blue.getc() == 'B') state = got_B;
+ else state = start;
+ break;
+ case got_B:
+ bnum = Blue.getc();
+ state = got_num;
+ break;
+ case got_num:
+ bhit = Blue.getc();
+ state = got_hit;
+ break;
+ case got_hit:
+ if (Blue.getc() == char(~('!' + ' B' + bnum + bhit))) button_ready = 1;
+ state = start;
+ break;
+ default:
+ Blue.getc();
+ state = start;
+ }
+}
+
+// **FUNCTIONS**
+
+// setLight: Sets a specified color strip to an input (0-100)
+// then saves that input to the variables rPercent or bPercent.
+//
+// Input values are not linearly correlated with the PWM duty cycle,
+// instead they are translated with a cubic function, so the lights
+// *appear* to be acting linearly
+void setLight(int input, PwmOut *LED){
+ if (input >100){ //Correct input to 100 if input is somehow too high
+ input = 100;
+ } else if (input <0){ //Correct input to 0 if input is somehow too low
+ input = 0;
+ }
+ if (LED == &bLED){ //If input is the blue LEDs
+ if (input >= bPercent){ // If input is HIGHER than current brightness
+ for (int i = bPercent; i < input; i++){ //Loop to gradually increase brightness until reaches desired value
+ float temp = i;
+ *LED = (((temp*temp*temp)/1000000));
+ wait(.01);
+ }
+ } else { // If input is LOWER than current brightness
+ for (int i = bPercent; i > input; i--){ //Loop until reaches desired value
+ float temp = i;
+ *LED = (((temp*temp*temp)/1000000));
+ wait(.01);
+ }
+ }
+ bPercent = (input); //Record input to current bPercent
+ } else { //If input is the red LEDs
+ if (input >= rPercent){
+ for (int i = rPercent; i < input; i++){
+ float temp = i;
+ *LED = (((temp*temp*temp)/1000000));
+ wait(.01);
+ }
+ } else { //if input < bPercent
+ for (int i = rPercent; i > input; i--){
+ float temp = i;
+ *LED = (((temp*temp*temp)/1000000));
+ wait(.01);
+ }
+ }
+ rPercent = (input);
+ }
+}
+
+
+// sliderSet: Nearly the same as setLight() but with built-in noise reduction
+// (Doesn't allow any changes greater than 2 at a time)
+void sliderSet(int input, PwmOut *LED){
+ float temp = input;
+ if (input >100){ //Set LED to 1 if input is somehow >= 100
+ *LED = 1;
+ return;
+ } else if (input <0){ //Set LED to 0 if input is somehow <= 100
+ *LED = 0;
+ return;
+ } else { //Cubic Function with noise reduction
+ int bDif = abs( bPercent - input);
+ int rDif = abs( rPercent - input);
+ if (LED == &bLED){ //IF BLUE LED
+ if (bDif <2 && bDif > -2){
+ *LED = (((temp*temp*temp)/1000000));
+ bPercent = (input);
+ }
+ } else { // IF RED LED
+ if (rDif <2 && rDif > -2){
+ *LED = (((temp*temp*temp)/1000000));
+ rPercent = (input);
+ }
+ }
+ }
+}
+
+// Returns the user percentage assigned to that LED.
+int getPercent(PwmOut *LED){
+ if (LED == &bLED){
+ return bPercent;
+ } else return rPercent;
+}
+
+// **MAIN**
+int main() {
+ //attach interrupt function for each new Bluetooth serial character
+ Blue.attach(&parse_message,Serial::RxIrq);
+ bLED.period_ms (1); //Set LED freq to 1Khz
+ rLED.period_ms (1);
+ PwmOut *LEDToControl = &bLED; //bLED is default LEDToControl
+ set_time(1574588800); //7:00am
+
+ while(1) {
+ if (mode == 1){
+ sliderSet(bSliderIn*100,&bLED);
+ sliderSet(rSliderIn*100,&rLED);
+ } else if (mode == 2){
+ time_t now = time(0);
+ tm *ltm = localtime(&now);
+ int cHour = ltm->tm_hour;
+ int cMin = ltm->tm_min;
+ if (cHour > 18 || cHour <7){ //If between 6pm and 7am, turn all lights off
+ setLight(0, &bLED);
+ setLight(0, &rLED);
+ } else if (cHour >= 7 && cHour < 8) { //From 7-8, fade as sunrise
+ int lightset = cHour*100+(cMin)/.6;
+ setLight((lightset-710)*8,&bLED); //Blue LED fade in at 7:06
+ setLight((lightset-700)*8,&rLED); //Red LED fade in at 7-7:08
+ pc.printf("Lightset: %i \n", lightset);
+ } else if (cHour >= 17 && cHour < 18) { //From 5-6, fade as sunset
+ int lightset = cHour*100+(cMin)/.6;
+ setLight(100-((lightset-1725)*8),&rLED); //Red LED fade out at 5:15-5:30
+ setLight(100-((lightset-1700)*8),&bLED); //Blue LED fade out at 5-5:15
+ } else {
+ setLight(100, &bLED);
+ setLight(100, &rLED);
+ }
+ }
+ //check for a new button message ready
+ if(button_ready) { // button changed
+ if(bnum=='1' && bhit == '1'){
+ mode = 0;
+ pc.printf("mode 0!\n");
+ } else if (bnum=='2' && bhit == '1'){
+ mode = 1;
+ setLight(bSliderIn*100,&bLED);
+ setLight(rSliderIn*100,&rLED);
+ pc.printf("mode 1!\n");
+ } else if (bnum=='3' && bhit == '1'){
+ mode = 2;
+ pc.printf("mode 2!\n");
+ }else if (bnum=='4' && bhit == '1'){
+ if (mode == 0){
+ if (LEDToControl == &bLED){
+ LEDToControl = &rLED;
+ } else {
+ LEDToControl = &bLED;
+ }
+ }
+ pc.printf("color!\n");
+ }else if (bnum=='5' && bhit == '1'){
+ if (mode == 0){
+ if (getPercent(LEDToControl) <= 95){
+ setLight((getPercent(LEDToControl)+10),LEDToControl);
+ }
+ }
+ pc.printf("inc!\n");
+ }else if (bnum=='6' && bhit == '1'){
+ if (mode == 0){
+ if (getPercent(LEDToControl)>=5){
+ setLight((getPercent(LEDToControl)-10),LEDToControl);
+ }
+ //time_t seconds = time(0);
+ //pc.printf("Time as a basic string = %s", ctime(&seconds));
+ }
+ }
+ button_ready = 0; //reset flag after reading button message
+ }
+
+ }
+
+}
+
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