Rotary encoders Pin out on grey code units

Using Arduino General Electronics
#1

hello can some one help rotary encoders on ebay for arduino use
been building a unit that has a grey code encoder required the information on the net is baffling me
it has 5 pins the same layout as a ky040 encoder this is an incremental one [2 pin side switch 3 pin side encoder out] recently used this ky040 model works a [dds signal generator for HF] this works OK
the centre pin of three on this ky model is connected to ground OK

Is the centre pin on the grey code model ground also ??

please i don’t want to sound stupid but not used encoders much purely a hobbyist here

if some one could point me in the correct direction much appreciated

#2

Links for both ?

#3

thanks for response i am unsure wether to add volts positive ??? to the grey unit ?

#4

sorry this is the code i have modified the code for 20x4 display on i2c and added swr meter on lines 2-3 not posted code yet as still working on prototype it verifies ok so in build mode the unit is on KD1JV web page

http://kd1jv.qrpradio.com/arduino/Arduino_tuner_aid.htm

i wont post code its very long but its on his site ok

#5

It's Gray code, after Frank Gray....

#6

that is very helpful "frank grey inventor" but how is this connected to wiring the encoder ??? question does it require positive voltage to work or not

#7

You evidently need to understand what a "pull-up" is.

The ATmegas (and many or most other microcontrollers) provide internal pull-up functions (generally by a FET rather than an actual resistor) which can be enabled by the INPUT_PULLUP mode in pinMode. So (all) the common switch connections connect to ground.

#8

Is there a "grey zone" ?

#9

thanks for the time but consider the post closed NO FIRM ANSWER GIVEN reason for closure

#10

steve73:
i am unsure wether to add volts positive ??? to the grey unit ?

The circuit designer does not.
In his sketch, these lines -

pinMode(enclk, INPUT_PULLUP); 
pinMode(endata, INPUT_PULLUP);

make it so that that's not necessary.
Sometimes you have to tell people around here when to shove off.

#11

steve73:
thanks for the time but consider the post closed NO FIRM ANSWER GIVEN reason for closure

Did you not read my reply #6?

#12

RP thanks for the explanation so power is not required separately it is derived from A0 A1 that’s fine will test and let you know the outcome unfortunately i am an old fart 60 never learned programming was not born with that skill 30 years as an mechanical engineer i find the best way for me to learn a skill is by doing a project so thanks again

#13