simplify the digital input section

- set all the content in a sigle file

Author: OlivierJourdan

www/en/modules/ROOT/nav.adoc

@@ -4,7 +4,7 @@
 
 * xref:analog-inputs-nav.adoc[Analog Input Examples]
 * xref:analog-outputs-nav.adoc[Analog Output Examples]
-* xref:digital-inputs-nav.adoc[Digital Input Examples]
+* xref:digital-inputs.adoc[Digital Input Examples]
 * xref:digital-outputs-nav.adoc[Digital Output Examples]
 
 * xref:gadgets-nav.adoc[Misc Gadgets Examples]

www/en/modules/ROOT/pages/digital-inputs-nav.adoc

@@ -1,29 +1,37 @@
 = Grove Digital Inputs
-:page-toclevels: 1
+:page-toclevels: 2
 
 == Overview
 
+A digital input can be thought of as the reading from a button, a switch or a digital sensor. These examples use the GPIO Pins [D16,D17],[D18,D19],[D20,D21] that correspond to connectors D16,D18 and D20 on the grove hat.
+
+image::GroveDigitalConnectionsPico.png[]
+
+== Example
+
+=== Overview
+
 This example uses the grove button module but the source code is also applicable for other similar Grove Modules.
 
 The GPIO Pins used are [D16,D17],[D18,D19],[D20,D21]
 
 image::GroveDigitalConnectionsPico.png[]
 
 
-== Hardware Details
+=== Hardware Details
 
 https://wiki.seeedstudio.com/Grove-Dual-Button/#features[Grove Dual Button]
 
 
-== Demo Video
+=== Demo Video
 
 
 Here is a video that shows the set-up and running of the Dual Button Digital Inputs
 
 video::ViA9pmmxI2Q[youtube]
 
 
-== Example Code
+=== Example Code
 
 Navigate to menu:Scratchpad[Grove > Digital Inputs > Grove Digital In.vi]
 
@@ -39,4 +47,4 @@ image::GroveDigitalInFP.png[]
 
 On the block diagram you can see that the selected Grove connector dictates the GPIO Pin and we then set the pin to [In]. Next we loop round and event structure and use the timeout to poll the digital inputs. Pressing Stop will fire the Stop event and exit the loop.
 
-image::GroveDigitalInBD.png[]
+image::GroveDigitalInBD.png[]