A bit confused re connecting the 4TS3 Push-button with led to an OP Master Card output

[Roarkr]

Hi,

I am building a OP MCP and use the OP Master Card as output to LEDs.

I plan to use the 4TS3 Push-button with LED and wonder if I need to connect a resistor in serie with the LED in the 4TS3? I guess I have to connect the Cathode of the LED to the common GND and the anode to the Master Card output after a resistor (if needed) , but I don not know which of the 2 pins on the 4TS3 is the cathode. I only have the excact number of items, so I want to avoid burning and be sure before I connect.

Could anyone help me out on this one?

rgs,
roarkr

[iwik]

Hi Roarkr,
Follow this link and click on Downloads, data sheet here has pin connections.

http://www.opencockpits.com/catalog/pushbutton-with-p-118.html
Les