Control the 850 Expansion Port digital outputs

Control the digital output from the 850 Universal Interface's Expansion Port.

The 850 Universal Interface includes a 44-pin Expansion Port, located on the back of the interface. When connected to a breadboard, this port provides access to- among other features- eight digital input/outport (I/O) ports, which can be configured in Capstone.

Enable the digital outputs

1. Connect the 850 Universal Interface to Capstone.
2. From the Hardware Setup tool, click Show Expansion Port to reveal the Expansion Port interface.

3. Click the yellow circle under one of the I/O port names, then click Digital Input or Digital Output to configure that port as an input or output.

   

Configure the digital outputs

Revealing the Expansion Port interface in Hardware Setup automatically causes the Digital Output tool to appear in the Tools palette. Any ports which have been configured as a Digital Output will automatically appear here for configuration.

• Digital Output Voltage: Click the box to select an output voltage of either 3.3 V or 5 V.

  Note

  This setting controls the output voltage for all digital outputs on the Expansion Port.

• Output Conditions: Control when an individual port outputs a digital signal with any of the following options:

  • Manually turn the port's output on or off.
  • Check the Auto box to make the port automatically begin outputting a signal when data recording begins and stop when data recording ends.

  • Input a logic expression as the activation condition by clicking and entering a calculation into the text box; the port will output a signal when the calculation is equal to 1. For example, the following calculation causes the port to output a signal when a connected temperature sensor measures a temperature less than 20 °C:

    SwitchOut1=([Temperature (°C)]<20)
    

    Note

    Logic expressions used in these calculations must be enclosed in parentheses.