A first sample program to reproduce the behaviour of the traffic lights both on the cars side and the pedestrians side.
Dependencies: TouchButton mbed
Revision 0:8fcdd90ff89e, committed 2015-03-23
- Comitter:
- taghoter
- Date:
- Mon Mar 23 20:56:43 2015 +0000
- Commit message:
- The first version of this sample program for reproducing the behaviour of the traffic lights on both the cars side and the pedestrians side.
Changed in this revision
diff -r 000000000000 -r 8fcdd90ff89e TouchButton.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TouchButton.lib Mon Mar 23 20:56:43 2015 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/taghoter/code/TouchButton/#5eb472334273
diff -r 000000000000 -r 8fcdd90ff89e main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Mar 23 20:56:43 2015 +0000
@@ -0,0 +1,158 @@
+#include "mbed.h"
+#include "TouchButton.h"
+
+// Example of a FSM mimicing the traffic light.
+// Touch the slider for requesting to walk through
+/*
+The purpose is to reproduce the behaviour of a traffic light both
+on the cars and the pedestrians sides. When placing the board with
+the slider on the bottom, it the left side of the slider the LED
+would reproduce the pedestrians side, turning the LED into green
+first, then blinking it and finally turning it into red. If the
+right side is touched the cars side is reproduced, turning the LED
+yellow, then red, and finally green. Time is given for cars to go
+through for some time although the traffic light has become green
+for cars and you touch the slider close to that moment -- some time is
+needed for the changes to take on.
+At first, on the cars side, is nothing is touched the traffic lights
+will be allowing cars to go through indefinitely.
+*/
+
+// Working with the FRDM-KL25Z board...
+
+#define PEDESTRIANS 0
+#define CARS 1
+
+unsigned char lastpressed, pedestrianrequest, whichside = 0;
+TouchButton slider;
+PwmOut r (LED_RED);
+PwmOut g (LED_GREEN);
+PwmOut b (LED_BLUE);
+
+unsigned char cnt;
+
+enum TL_States_t {Init, DontWalk, WaitBut, WaitSafe, Walk, BlinkDontWalk } tl_state;
+
+inline void SetLedRed() {
+ r=0;
+ g=b=1;
+}
+
+inline void SetLedGreen() {
+ g=0;
+ r=b=1;
+}
+
+inline void SetLedYellow() {
+ r=g=0;
+ b=1;
+}
+
+inline void SwitchOffLed() {
+ g=r=b=1;
+}
+
+int TickFunc_TrafficLights()
+{
+ // Next-state setting.
+ switch (tl_state) {
+ case Init:
+ tl_state = DontWalk;
+ cnt = 0;
+ // Setting the LED red
+ r=0;
+ g=b=1;
+ break;
+ case DontWalk:
+ if (lastpressed) {
+ pedestrianrequest = 1;
+ whichside = lastpressed - 1;
+ };
+ if (cnt < 20) {
+ tl_state = DontWalk;
+ cnt++;
+ }
+ else {
+ if (!pedestrianrequest)
+ tl_state = WaitBut;
+ else
+ tl_state = WaitSafe;
+ cnt = 0;
+ };
+ if (whichside == CARS)
+ SetLedGreen();
+ else
+ SetLedRed();
+ break;
+ case WaitBut:
+ if (!lastpressed)
+ tl_state = WaitBut;
+ else {
+ whichside = lastpressed - 1;
+ // We'll use the whichside value 0 for showing the pedestrian side
+ // and the whichside value 1 for the cars side.
+ tl_state = WaitSafe;
+ // cnt = 0; // Already done.
+ };
+ break;
+ case WaitSafe:
+ // We start attending the pedestrians request here...
+ pedestrianrequest = 0;
+ if (cnt < 3) {
+ tl_state = WaitSafe;
+ cnt++;
+ }
+ else {
+ tl_state = Walk;
+ };
+ if (whichside == CARS)
+ SetLedYellow();
+ else
+ SetLedRed();
+ break;
+ case Walk:
+ if (cnt < 20) {
+ tl_state = Walk;
+ cnt++;
+ }
+ else {
+ tl_state = BlinkDontWalk;
+ cnt = 0;
+ };
+ if (whichside == CARS)
+ SetLedRed();
+ else
+ SetLedGreen();
+ break;
+ case BlinkDontWalk:
+ if (cnt < 8) {
+ tl_state = BlinkDontWalk;
+ cnt++;
+ }
+ else {
+ tl_state = DontWalk;
+ cnt = 0;
+ }
+ if (whichside == PEDESTRIANS) {
+ r=b=1;
+ g = g ? 0 : 1;
+ }
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+int main() {
+ tl_state = Init;
+ r=g=b=1;
+ while(1) {
+ lastpressed = slider.PressedButton() < 0.5 ? 0 : 1;
+ lastpressed = slider.PressedButton() < 2 ? lastpressed : 2;
+ // lastpressed will be 0 in case that the slider is not touched, 1 in case
+ // the finger is on the left, and 2 if it is on the right.
+ TickFunc_TrafficLights();
+ wait(0.5);
+ }
+}
diff -r 000000000000 -r 8fcdd90ff89e mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Mar 23 20:56:43 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/7e07b6fb45cf \ No newline at end of file