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Originally Posted by arber333
Its been a while. I got AB encoder on my motor and want to test it.
https://www.rls.si/products/rotary-m...r-tooth-sensor
Its like you said 5V - 24V powered magnetic encoder. How did you separately power it? So did you uncouple + 5v wire on encoder harness and use 24V? |
My encoder uses an 8 pin round, so I had to make an adapter anyway. I connected the grounds together, using the 24V that powers the controller board (Paul's 12V/24V DC/DC converter) to power the encoder. When I first connected the grounds together, I did the connection with a 1K resistor first and I checked for current flow in case it caused an issue. This power scheme seems to work OK.
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I can also use cars 13.8Vdc.
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I would avoid an unfiltered power supply. I have not blown up an encoder as yet, but I have killed many a piece of electronics by connecting it to 13.8V in an car. It's a noisy, nasty power supply at best. A small DC/DC supply is well worth it.
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What kind of resistors did you use for pullup to get good signal?
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I had 1K and .. 5K2 I think .. kicking around my bench. The input current to the micro is not really noticeable. My target was 4.5V, I calculated 4.6V and I measured just over 4.4V. The resistors are +/- 5%. I think the current was under 4 mA.
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Do you have 1K resistors from connector to chip pins or did you remove them? How do they interact?
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I have 1K resistors in series with the chip inputs. I don't recommend *EVER* removing the series resistors from chip inputs. Even for testing. My clumsiness translates to shorted pins ... and letting out the magic smoke! My scope probes are a bit big to clip onto the chip pins, so I measured on the resistor. 4.4V was enough.
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It seems my inverter does not want to run run-rotor-test command....
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It's a journey ... keep eliminating barriers and you'll get there!