Documentation

README.md

@@ -101,7 +101,7 @@ ReceiveDemo + SendDemo in one program. Receiving while sending.
 Record and play back last received IR signal at button press.
 
 ### MinimalReceiver + SmallReceiver
-If code size matters look at these examples.
+If code size matters, look at these examples.
 
 ### IRDispatcherDemo
 Framework for calling different functions for different IR codes.
@@ -164,6 +164,12 @@ The receiver sample interval is generated by a timer. On many boards this must b
 Every pin can be used for receiving.<br/>
 The send PWM signal is by default generated by software. **Therefore every pin can be used for sending**.
 
+| Software generated PWM showing discontinuities in the Arduino core micros() function | Zoom into the discontinuity. The space is once too short but compensated at the next one |
+|-|-|
+| ![Software PWM](https://github.com/Arduino-IRremote/Arduino-IRremote/blob/master/pictures/IR_PWM_by_software.png)                                                              | ![Software PWM detail](https://github.com/Arduino-IRremote/Arduino-IRremote/blob/master/pictures/IR_PWM_by_software_zoom.png) |
+| Software generated PWM (ATmega328) with 33% Duty cycle |   |
+| ![Software PWM detail](https://github.com/Arduino-IRremote/Arduino-IRremote/blob/master/pictures/IR_PWM_by_software_detail.png) |   |
+
 ## Hardware-PWM signal generation for sending
 If you define `SEND_PWM_BY_TIMER`, the send PWM signal is generated by a hardware timer. The same timer as for the receiver is used.
 Since each hardware timer has its dedicated output pins, you must change timer to change PWN output.<br/>