<NME> README.md
<BEF> ## WALT Latency Timer ##

**DISCLAIMER:** This is not an official Google product.

 * [Post about WALT on Android Developers Blog](http://android-developers.blogspot.ca/2016/04/a-new-method-to-measure-touch-and-audio.html)
 * [Instructional videos showing how to use WALT](https://www.youtube.com/playlist?list=PLd6Fi7WgXfcCEJg1FDqNCoQfpWo7W3J5a)
 * [Detailed usage instructions](docs/usage/WALT_usage.md)
 * Mailing list - [walt-discuss](https://groups.google.com/forum/#!forum/walt-discuss)
 * Low-traffic mailing list for major announcements [walt-announce](https://groups.google.com/forum/#!forum/walt-announce)

WALT is designed to measure the latency of physical sensors and outputs on phones and computers. It can currently perform the following measurements:
 * Drag latency (scroll) - [details](docs/DragLatency.md)
 * Screen draw latency - using a photodiode that detects whether the screen is black or white.
 * Audio input / output latencies. Input latency will be usually referred as microphone latency.

## Notes
* Hardware build instructions can be found in this repository under hardware/
[installed from Google Play](https://play.google.com/store/apps/details?id=org.kamrik.latency.walt)
or downloaded in the [releases section](https://github.com/google/walt/releases); the iOS app must be built from source.

![WALT photo](docs/WALT_photo_audio_r07.jpg)


## Notes
* Hardware build instructions can be found in this repository under `hardware/`.
* Clock synchronization details are described [here](android/WALT/app/src/main/jni/README.md).
* The Android/iOS device and Teensy clocks have a tendency to diverge due to
  differing clock frequencies. This means they will go out of sync after
  several minutes. The workaround is to use the app to re-sync the
  clocks. Some, but not all tests in the app will sync the clocks when starting a measurement.
* Python code used to communicate with WALT from Linux and ChromeOS can be found
  [here](https://chromium.googlesource.com/chromiumos/platform/touchbot/+/master/quickstep/).


<MSG> Add photo to main README

#2 - Added a photo of one of the versions of WALT to the main README file
<DFF> @@ -12,6 +12,10 @@ WALT is designed to measure the latency of physical sensors and outputs on phone
  * Drag latency (scroll) - [details](docs/DragLatency.md)
  * Screen draw latency - using a photodiode that detects whether the screen is black or white.
  * Audio input / output latencies. Input latency will be usually referred as microphone latency.
+ 
+
+![WALT photo](docs/WALT_photo.jpg)
+ 
 
 ## Notes
 * Hardware build instructions can be found in this repository under hardware/

Add photo to main README