PreenFM > PreenFM1 (the blue one)

Encoders question

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Dude72:
Hi all!
The author uses encoders PEC11-4220F-N0024.
They have the following specification:
Pulses per Revolution    24 PPR
Number of Detents    24
Number of Channels    
Mounting Style    SMD/SMT
Termination Style    
Output    2-bit Gray Code
Shaft Type    Metal Flatted
With Switch    Without

Can I use these encoders: This item 140739970480 on ebay?
http://www.ebay.com/itm/10pcs-12mm-Rotary-Encoder-Switch-Keyswitch-NEW-/140739970480?pt=LH_DefaultDomain_0&hash=item20c4c185b0

They have the following specification:
* Rotary Shaft Length: Approx. 12mm
* Shaft Full Length: Approx. 20mm
* Shaft Diameter: Approx. 6mm
* Size (L x W): Approx. 15 x 11mm
* Output: 2-bit gray code
* Closed Circuit Resistance: 3 ohms maximums
* Max. Rating: 10 mA @ 5 VDC
* Operating Temperature Range: -30 to 70 degrees celsius
* Storage Temperature Range: -40 to 85 degrees celsius
* Rotational Life: 30000 cycles minimum
* Switch Life: 20000 cycles minimum

In the specification there is no information on the number of Detents and pulses. Having made a full turn, I found that the number of Detents is 20.
I understand that the main difference between them is 20 Detents, rather than 24 and the presence of a tact switch.

6581punk:
If they mount the board they should work. You will need to cut off the two pins for the switch though. Editing values may be a little slower due to less pulses per turn.

Dude72:
oh, thanks!
I will try them. Now possible to buy those 10 encoders just for few dollars.
Waiting for the buttons, 24LC512 and 6N137 now. I have already 6N138 and 139. I found that 137 is more good for faster applications. Usually in MIDI interface 6N138 or 139 is enough.

Xavier:

Let us know if you try them.
The PreenFM encoder driver expects the quadrature table of the bourns encoder :
http://www.bourns.com/data/global/pdfs/PEC11.pdf
If your encoders are compatible, they will work.

Xavier

Dude72:
I've got other necessary parts. Changed 74HC165N to CD74HCT165. Work well but encoders have other direction "left-right". Probably last firmware of MidiBox FM will explain the problem: other type of encoders, I read about the same on www.megadrum.info This device have one option "Alt Encoders" for work with other type of encoders. It will be nice make this option in future firmware :)

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