Diff: readme.md

Revision:

63:8ec90c81ff7d

Parent:

4:52bffaff7f0b

--- a/readme.md	Tue May 01 17:51:51 2018 +0000
+++ b/readme.md	Wed May 02 12:14:43 2018 +0000
@@ -1,9 +1,10 @@
-This example creates and updates a standard Battery Level service containing a single
+This example creates and updates a CO2 Monitoring service containing a single
 GATT characteristic.
 
-The [battery service transmits](https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.battery_service.xml) a device's battery level in percentage, with 100% being a fully charged battery and 0% being a fully drained battery.
+The service updates a CO reading in parts per million (PPM).
 
-Although the sample application runs on a BLE device, it doesn't show the device's real battery level (because that changes very slowly and will make for a dull example). Instead, it transmits a fake battery level that starts at 50% (half charged). Every half second, it increments the battery level, going in single increments until reaching 100% (as if the battery is charging). It then drops down to 20% to start incrementing again.
+The sample application runs on a BLE device  The CO2 level should not be read more than every 2 seocnds as the sensor itself doesn't update the value more frequently. Also, the nRF52DK board for which this is written can power the sensors -- 5v at 500ma -- it sometimes struggles to keep the power rail steady. When this happens, the sensor begins to fail. If there are more than 5 sensor failures in a row, the device automatically reboots which usually foxes the problem.
+
 
 # Running the application
 
@@ -45,24 +46,13 @@
 
     **figure 3**  How to establish a connection using Master Control Panel 4.0.5
 
-1. Discover the services and the characteristics on the device. The *Battery service* has the UUID 0x180F and includes the *Battery level* characteristic which has the UUID 0x2A19.
-
-    ![](img/discovery.png)
-
-    **figure 4** Representation of the Battery service using Master Control Panel 4.0.5
-
-1. Register for the notifications sent by the *Battery level* characteristic.
-
-    ![](img/register_to_notifications.png)
-
-    **figure 5** How to register to notifications using Master Control Panel 4.0.5
+1. Discover the services and the characteristics on the device. The *undefined service* has the UUID 0xA000 and includes the *undefined* characteristic which has the UUID 0xA0001.
 
 
-1. You should see the battery level value change every half second. It begins at 50, goes up to 100 (in steps of 1), resets to 20 and so on.
+1. Register for the notifications sent by the *undefined* characteristic.
 
-    ![](img/notifications.png)
 
-    **figure 6** Notifications view using Master Control Panel 4.0.5
+1. You should see the CO2 reading value change.
 
 If you can see the characteristic, and if its value is incrementing correctly, the application is working properly.