Filament Width Sensor

[REDxFROG]

In Marlin Configuration_advanced it says

• 34 RAMPS_14 : Analog input 5 on the AUX2 connector
  • 81 PRINTRBOARD : Analog input 2 on the Exp1 connector (version B,C,D,E)
  • 301 RAMBO : Analog input 3

But SKR 1.3 doesn't have AUX2. Is it still possible to connect a Filament Width Sensor to the board somehow? It needs to feed 0-5V to the board while 1,75V means 1,75mm Filament.

[goldjunge91]

then use aux 1 you have there 2x 5V 2xGND and the tx and rx pins i use this pin for high temp pt100

[REDxFROG]

hello, thanks.

I have found this in pins_RAMPS.h

``#ifndef FILWIDTH_PIN

define FILWIDTH_PIN 5 // Analog Input on AUX2

endif````

of course the same cannot be found in pins_BIGTREE_SKR_V1.3.h

What does 5 mean? Pin 5 ? Does that mean there are schematic with every pin listed as a number? Sorry I'm completely clueless but I've ordered 2 filament sensors and didn't think it would cause a problem to connect them. If anyone could help me, highly appreciated. Otherwise I have to buy RAMPS board. (which would cause even more problems I fear)

[goldjunge91]

so make this in the pins_BT_SKR_common.h

#ifndef FILWIDTH_PIN
  #define FILWIDTH_PIN P0_03_A6 // Analog Input on AUX1 RX0 pin 
#endif

AUX 1 RX0 PIn = PIN P0_03_A6 TX0 Pin = PIN P0_02_A7

[goldjunge91]

and way you check the ramps pinout when you have a skr board maybe u can only this

define FILWIDTH_PIN P0_03_A6

[REDxFROG]

I'm using the P0_03_A6 (RX0) now but the numbers on the printer display are jumping like no good.

On the multimeter I can get a good 1.74V reading from the Sensor itself.

Even when I plug an empty cable to RX0 or TX0 the numbers on the printer display are jumping. Also if my fingers get close to the cable. Something is way too oversensitive? I don't understand any of this to be honest.

It reads something like $:3.3 : 100% - $:3.7 : 100% on the display when no cable is connected. Numbers jumping around. There is no input, yet still the numbers are floating.

When I plug in the cable from Sensor to RX0...the numbers are way too jumpy even while nothing moves.

So far I haven't tried to actually print because I have to add a 3,3V Zener Diode.

PS Always reads 100%. Even when I set delay to 0cm and error margin to 2.1mm. But perhaps the calculation only works when it's running.

[REDxFROG]

Ok for some reason I get wrong readings Spammed M407 quickly

SENT: M407 READ: Filament dia (measured mm):42.74 READ: ok SENT: M407 READ: Filament dia (measured mm):42.84 READ: ok SENT: M407 READ: Filament dia (measured mm):42.76 READ: ok SENT: M407 READ: Filament dia (measured mm):42.46 READ: ok SENT: M407 READ: Filament dia (measured mm):42.13 READ: ok SENT: M105 SENT: M407 READ: Filament dia (measured mm):41.87 READ: ok SENT: M407 READ: Filament dia (measured mm):41.77 READ: ok SENT: M105

40mm ? o_O

[REDxFROG]

I have made a bit of progress,

but the input is floating up and down. I have 2x SKR1.3 , one SKR1.3 has even bigger problems to hold this input number

pin P0_03_A6 (AUX2 RX0)

READ: Filament dia (measured mm):1.69 READ: ok SENT: M105 READ: ok T:26.02 /0.00 B:26.02 /0.00 @:0 B@:0 SENT: M407 READ: Filament dia (measured mm):1.70 READ: ok SENT: M407 READ: Filament dia (measured mm):1.70 READ: ok SENT: M407 READ: Filament dia (measured mm):1.71 READ: ok SENT: M407 READ: Filament dia (measured mm):1.72 READ: ok SENT: M407 READ: Filament dia (measured mm):1.73 READ: ok SENT: M407 READ: Filament dia (measured mm):1.74 READ: ok SENT: M407 READ: Filament dia (measured mm):1.75 READ: ok SENT: M407 READ: Filament dia (measured mm):1.76 READ: ok SENT: M407 READ: Filament dia (measured mm):1.77 READ: ok SENT: M407 READ: Filament dia (measured mm):1.77 READ: ok SENT: M407 READ: Filament dia (measured mm):1.78 READ: ok SENT: M105 READ: ok T:26.14 /0.00 B:26.02 /0.00 @:0 B@:0 SENT: M407 READ: Filament dia (measured mm):1.79 READ: ok SENT: M407 READ: Filament dia (measured mm):1.80

same with pin P1_31, on EXP2 1.31.

spammed "Send M407" again. It slowly goes up and down and up and down... The multimeter shows steady 1,76V for example.

This is my math in filwidth.h

// Convert raw measurement to mm static inline float raw_to_mm(const uint16_t v) { return v 0.2058f RECIPROCAL(float(MAX_RAW_THERMISTOR_VALUE)); } static inline float raw_to_mm() { return raw_to_mm(raw); }

0.2058 instead of 5.0

[fabio-bianc]

Hi. I had the same problem. Did you find a solution?

[goldjunge91]

(sorry i didn't see your answers) wich display are you using ? when you use the tft touchscreen then its come from touchscreen i think. but im not 100% sure. i use PIN P0_03_A6 for a e3d pt100 amplifier board and i get never problems with my temps

[Manu512]

Hi, Same problem.

My math in filwidth.h

// Convert raw measurement to mm static inline float raw_to_mm(const uint16_t v) { return v 0.126025f RECIPROCAL(float(MAX_RAW_THERMISTOR_VALUE)); } static inline float raw_to_mm() { return raw_to_mm(raw); }