600 PPR 5v rotary encoder filament monitor help

alankilian

5V_Ext - Enc Vcc

5V_Ext is not a sourse of 5 Volts. It's an INPUT for external 5 Volt power supply. There's a diode in the way so you cannot power the encoder from that pin.

Try a different source of 5 Volts.

CNCModeller

@alankilian

There's definitely 5v on that pin, I've just checked with my multimeter.

And the documentation says the IO 0 thru 4 supply 5v.

Or am I missing something here?

alankilian

@cncmodeller Oh, I see, I was thinking you had connected to 5V_EXT_IN.

Sorry.

I'm out of ideas.

Can you connect an LED or something to the encoder output and see if it blinks when you turn the encoder? That would verify it's getting power and producing a signal.

CNCModeller

@alankilian said in 600 PPR 5v rotary encoder filament monitor help:

@cncmodeller Oh, I see, I was thinking you had connected to 5V_EXT_IN.

Sorry.

I'm out of ideas.

Can you connect an LED or something to the encoder output and see if it blinks when you turn the encoder? That would verify it's getting power and producing a signal.

Good idea, I'll give it a go tomorrow evening.

Alex.cr

@cncmodeller how did you perform your 200 mm extrusion to test the encoder? It sounds like you just commanded the extruder move manually.

The filament monitor code only works when running a job through the SD card. If you haven’t, try running a print and when you are a few layers in check with M591 as you did before.

CNCModeller

@alex-cr thanks, I'll check it out.

The monitor may have been working as I had a print pause last night, but unfortunately I don't know why as DWC stopped working too. I have another thread following that up.

Many thanks
Barry M

o_lampe

@cncmodeller said in 600 PPR 5v rotary encoder filament monitor help:

M591 D0 P7 C"io4.in" S1 R1:1000 L0.0523 E0.1

The Wiki doesn't specify if it expects a positive or negative pulse for a P7 sensor?
Did you try to invert the pin with "!"?
The default value for 'E' is 3mm, are you sure it accepts 0.1mm? Maybe the polling frequency is too high then?
OTOH your R-values are pretty 'generous', this doesn't make sense with the fine E-polling.

Another thing I'm worried about is the L-value. It's already truncated to 0.052. How can you calibrate it, when the last digit is already cut off?

CNCModeller

@o_lampe said in 600 PPR 5v rotary encoder filament monitor help:

@cncmodeller said in 600 PPR 5v rotary encoder filament monitor help:

M591 D0 P7 C"io4.in" S1 R1:1000 L0.0523 E0.1

The Wiki doesn't specify if it expects a positive or negative pulse for a P7 sensor?
Did you try to invert the pin with "!"?
The default value for 'E' is 3mm, are you sure it accepts 0.1mm? Maybe the polling frequency is too high then?
OTOH your R-values are pretty 'generous', this doesn't make sense with the fine E-polling.

Another thing I'm worried about is the L-value. It's already truncated to 0.052. How can you calibrate it, when the last digit is already cut off?

@o_lampe I'm now getting the following response which is great:

24/05/2021, 13:15:01 m591 d0
Pulse-type filament monitor on pin io4.in, enabled, sensitivity 0.052mm/pulse, allowed movement 1% to 1000%, check every 0.1mm, measured sensitivity 0.058mm/pulse, measured minimum 63%, maximum 150% over 441.9mm

I get where you are coming from, a couple of more decimal places for the calibration value may be necessary given the resolution of the encoder.

I'm going to set the sensitivity to 0.058mm/pulse and see how far out it is on my next test print.

Many thanks folks, glad this is working now

All the best
Barry M

CNCModeller

@alex-cr said in 600 PPR 5v rotary encoder filament monitor help:

@cncmodeller how did you perform your 200 mm extrusion to test the encoder? It sounds like you just commanded the extruder move manually.

The filament monitor code only works when running a job through the SD card. If you haven’t, try running a print and when you are a few layers in check with M591 as you did before.

@Alex-cr you were right... its responding now I've tried it during a test print. Thanks very much for your input, very helpful!

Barry M

alankilian

@cncmodeller GREAT NEWS Barry!

I was stumped. It seemed like you had everything right (which you did) and I learned something new from this thread.