There are two ways to see current sensor readings: Sensor Status or USB Sensors.
Sensor Status (Access tab)
- Go to Access :: Table.

- In the table Name column, click on Gpio (displays pop-up dialog).

- Review details on: Smoke_Alarm (Input: Off/On, GPIO2 Input State: Off/On).
There are options to set smoke detector sensor status conditions. Select Smoke_Alarm checkbox and click appropriate button. 
- Sensors Status
- Turn On
- Turn Off
USB Sensors (Tracking tab)
To view current USB sensor readings:
- Go to Tracking :: HW Monitor :: USB Sensors.

- On the table review the sensor’s current readings.