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enter image description hereEvery datasheet that I have looked at mentions the function of pins A, B and C but no mention of D and E. I'm unsure which one is the push button output and which one is the Ground pin. I'm currently looking at this one: http://uk.rs-online.com/web/p/mechanical-rotary-encoders/6234237/

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A range of 12mm mechanical encoders available with or without a push switch, ideal for controls for image and sound devices such as audio mixers and electronic instruments.

Wild guess: these two contacts are simply connected to the push switch, if present.

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  • \$\begingroup\$ Not wild at all. The linked picture shows the (green) switch attached to the back of the rotary encoder propper. \$\endgroup\$ – Wouter van Ooijen Aug 30 '17 at 8:07
  • \$\begingroup\$ I have added the picture of the particular model I chose. Does this mean I can connect any of the D or E to the Microcontroller? And the other one to the ground? \$\endgroup\$ – foad90 Aug 30 '17 at 8:10
  • \$\begingroup\$ well, it's a push switch. So, do whatever you want with that :) \$\endgroup\$ – Marcus Müller Aug 30 '17 at 8:12
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This information is in the datasheet which your (good) supplier has linked on that page.

enter image description here

Figure 1. Encoder pinout. (Click to enlarge.)

Under Electrical Specification on page 194 you can find the encoder pinout. The two pins on the other side are the push-button contacts.

enter image description here

Figure 2. (1) Encoder ABC. (2) Push-button pins.

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  • \$\begingroup\$ Thanks! I just didn't understand what I was looking at. My inexperience with rotary encoders, that's all. \$\endgroup\$ – foad90 Aug 30 '17 at 8:12

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