Revision 1:d3ea51e4c4ff, committed 2021-10-05

Comitter:

timo_k2

Date:

Tue Oct 05 12:14:27 2021 +0000

Parent:

0:d7a17d0b2bd3

Commit message:

Initial commit for the 3 LED circuit.

Changed in this revision

--- a/README.md	Fri Sep 04 18:40:54 2020 +0000
+++ b/README.md	Tue Oct 05 12:14:27 2021 +0000
@@ -1,3 +1,11 @@
+McLab12_MOSFET_PWM_3chLED_OS6_tk1
+Hardware
+L432KC or similar with PWM capable outputs.
+The L432KC pin D13 for onboard LED is not PWM capable!
+LEDs and xxx Ohm resistor. For example for a 12 V supply,
+three LEDs in series select a 120 Ohm resistor for 20 mA LEDs. 
+For testing 3 pieces MOSFET IRL540, LEDs, resistors. 
+
 PWM example for students to work with a MOSFET circuit. 
 
 ### License and contributions

--- a/main.cpp	Fri Sep 04 18:40:54 2020 +0000
+++ b/main.cpp	Tue Oct 05 12:14:27 2021 +0000
@@ -6,48 +6,83 @@
  * PWM example using the PwmOut API
  *
  *********************************************
- *Description: McLab12_MOSFET_PWM_OS6_tk1
+ *Description: McLab12_MOSFET_PWM_3chLED_OS6_tk1
  * Hardware
  * L432KC or similar with PWM capable outputs.
  * The L432KC pin D13 for onboard LED is not PWM capable!
- * LED and 220 Ohm resistor
- * For testing MOSFET: IRL540 + protection diode + DC motor
+ * LEDs and xxx Ohm resistor. For example for a 12 V supply,
+ * three LEDs in series select a 120 Ohm resistor for 20 mA LEDs. 
+ * For testing 3 pieces MOSFET IRL540, LEDs, resistors. 
  * Connect:
- * L432KC D10 -- 220 Ohm -- LED+ 
- * L432KC GND -- LED-
- * or
- * L432KC D10 -- MOSFET gate
- *
+ * L432KC VIN --- 5V from a 5 V regulator on 12 V supply.
+ * L432KC D3 -- MOSFET gate 
+ * L432KC D5 -- MOSFET gate
+ * L432KC D6 -- MOSFET gate
+ * 
+ * MOSFET drain -- resistor -- LEDs -- 12 V.
+ * MOSFET source -- GND
  * Operating system OS 6.0
- * Timo Karppinen 4.9.2020  Apache-2.0
+ * Timo Karppinen 5.10.2021  Apache-2.0
  */
 
 #include "mbed.h"
+#include <cmath>
 
-// Speed change every x seconds
-#define SpeedChanging_RATE     1s
+// change every x milliseconds
+#define changing_RATE     10ms
 
-// Initialise the digital pin D10 as a pwm output
+// Initialise the digital pins as a pwm output
 // The pin needs to be one of the PWM capable pins ! 
-PwmOut pwmMOSFET(D10);
+PwmOut pwmMOSFET1(D3);
+PwmOut pwmMOSFET2(D5);
+PwmOut pwmMOSFET3(D6);
 // Variables for the pwm
-int spCount = 1;
-float speed = 1.0;   // from 0.0 to 1.0 
+int intensCount1 = 1;
+int intensCount2 = 1;
+int intensCount3 = 1;
+float angle1 = 0.0;
+float angle2 = 0.0;
+float angle3 = 0.0;
+float intens1 = 1.0;   // from 0.0 to 1.0 
+float intens2 = 1.0; 
+float intens3 = 1.0; 
 float usT = 1000;   // f = 1000 Hz  T = 1 ms = 1000 us
                     // f = 10000 Hz  T = 100 us
 int main()
 {
-    pwmMOSFET.period_us(usT);
-    pwmMOSFET.write(1.0f);
+    pwmMOSFET1.period_us(usT);
+    pwmMOSFET2.period_us(usT);
+    pwmMOSFET3.period_us(usT);
+    pwmMOSFET1.write(1.0f);
+    pwmMOSFET2.write(1.0f);
+    pwmMOSFET3.write(1.0f);
+    
     while (true) {
+  
+        angle1 = angle1 + 0.1;
+        intens1 = 0.5 + 0.5 *sin(angle1);
+        
+        angle2 = angle2 + 0.08;
+        intens2 = 0.6 + 0.4 *sin(angle2);
         
-        spCount = spCount + 1;
-        if(spCount == 25){
-            spCount = 1;
+        angle3 = angle3 + 0.02;
+        intens3 = 0.7 + 0.3 *sin(angle3);
+        
+        if(angle1 > 628.31852){
+            angle1 = 0.0;
+            }
+        if(angle2 > 628.31852){
+            angle2 = 0.0;
             }
-        speed = 1/(float)spCount;
-        pwmMOSFET.write(speed);
+        if(angle3 > 628.31852){
+            angle3 = 0.0;
+            }
+        
         
-        ThisThread::sleep_for(SpeedChanging_RATE);
+        pwmMOSFET1.write(intens1);
+        pwmMOSFET2.write(intens2);
+        pwmMOSFET3.write(intens3);
+        
+        ThisThread::sleep_for(changing_RATE);
     }
 }
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