Rotary Encoder waveform?

Richard905

Hi, I am very new to Parallax, using an encoder for stepper motor control, i.e. let stepper motor synchronize encoder rev.
my questions are:

1. Rotary Encoder SUNX ORE-38-1000C This encoder produces sine waves or square waves?

2. Assume above encoder produces sine waves, how to use a comparator to convert these into square waves? Comparator IC / circuit diagram example?

3. Could I use LS7184 to convert into square waves?

4.how many microseconds pulse width is long enough for Parallax P8X32A QuickStart to detect the pulse?

Thanks

T Chap

Hi Richard. Do you have the enoder with you? A volt meter? If so, put the meter on one of the outputs and see what happens when you spin it slowly.

Richard905

Hi T Chap:
I just put the meter on A output of encoder, the meter displays between 0.00, -0.01V, -0.02V, is it normal? (This encoder worked well with Arduino)
(Wondering: it should show 0v-5V signal?)

Thanks

T Chap

The encoders I am familiar with swing from 0 to your supply voltage. Are you testing with the outputs disconnected from anything else?

kwinn

Richard905 wrote: »

Hi T Chap:
I just put the meter on A output of encoder, the meter displays between 0.00, -0.01V, -0.02V, is it normal? (This encoder worked well with Arduino)
(Wondering: it should show 0v-5V signal?)

Thanks

Did the arduino input pin have a pullup resistor on it?

Most encoders are digital (no comparator needed), but may have an open collector output so a pullup resistor is needed.

Duane Degn

According to the datasheet, yours is an open-collector unit.

Since these encoders are good up to 100KHz the pulses shouldn't be shorter than 10us long. Plenty of time for a Propeller to monitor it.