Add current waveform images.

Author: peterhinch

README.md

@@ -33,7 +33,7 @@ This repository comprises the following parts.
 # 2. Version and installation of uasyncio
 
 The documentation and code in this repository assume `uasyncio` version
-2.0, which is the version on PyPi and in the official micropython-lib. This
+2.0.x, which is the version on PyPi and in the official micropython-lib. This
 requires firmware dated 22nd Feb 2018 or later. Use of the stream I/O mechanism
 requires firmware after 17th June 2018.
 

lowpower/README.md

@@ -171,6 +171,18 @@ A data logging application might tolerate latencies of many seconds while
 waiting for a long delay to expire: getting close to `ib` may be practicable
 for such applications during their waiting period.
 
+### 3.2.3 Current waveforms
+
+Running `lpdemo.py` while it waits for a button press with latency = 200ms.  
+Vertical 20mA/div  
+Horizontal 50ms/div  
+![Image](./lowpower.png)
+
+Vertical 20mA/div  
+Horizontal 500μs/div  
+![Image](./lowpower1.png)  
+
+
 # 4. The rtc_time module
 
 This provides the following.