encoder wowes

[wallaby]

Dave,

I tried it out and it is counting nicely, but still in increments of 2! It seems to think that the encoder has transitioned twice ( both going high, albeit one in front of the other ) so it goes up by 2. If you carefully half turn the encoder and make one input go up on its own, it then goes up by one. As soon as you let go and the other goes up, it counts up by one again.

If you can give me a mailing address in the US I will post one off to you free, they are quite a nice encoder and I have a few spare. If you like you can email me direct at [email protected] with your address and I will send it. Might come in handy for a project of yours in the future.

Otherwise I will keep playing around with the test one here.

Cheers

Nigel

[Dave]

Thanks Nigel, I just emailed you my address.

[Dave]

wallaby, I just received the encoder yesterday and it sure looks cool... You didn't tell me that it had a pushbutton on it as well. I'll hook it up this weekend and get back to you on Monday. Once again thanks....

Dave Purola,
N8NTA

[wallaby]

O.K , glad to see it arrived safely.

Cheers

Nigel

[Dave]

Nigel, After hooking up the encoder you sent me and looking at it with a scope I found it is working as advertised. I went to the ALPS website and lo & behold the documentation says it has detents on every other (2 of the 4 states) of the encoder output. That is why the encoder seems to be counting by 2 because it actually is. Attached is the waveform for the output of the encoder at the detents. The suggested connection is 5 volts thru a 10k to the switch. Then a 10k from the switch in series with a .01uF to ground with the connection of the 10k and the .01uF going to the processor. This provides a filter mechanism to counter act any switch bounce that may occure due to the nature of the rotary switch. Once again, Thanks Nigel....

Dave Purola,
N8NTA

[Macgman2000]

Hello Wallaby,

Are you posting the hardware schematic of the radio? I tinker with receivers also. I am always looking to learn something new!!!

Best Regards,
Nick
KC6SDF

[wallaby]

Hi Dave,

O.K on the encoder, did you manage to get it to go up by one, even though it has two steps for one turn? or does the cap R/C take care of this.

Yes when the receiver goes I will, it uses a commercial VCO module which is custom made so you would need to insert your own design. The front end is fairly standard, using BF998 RF and IF, BB814 varactors and toko SMD coild. The 21.4 IF has a 25 khz 8 pole filter, the receiver chip is the toko 10931V. These were chosen because they had AM, and the receiver tunes 118 to 137 mhz as well.

Cheers

Nigel