Anet A8 Optical Sensor Mount for Omron Spy 412 Auto Bed Leveling by chertle

Last crawled date: 3 years ago

Somewhere in the deep of the web , i've found a user, he experimented with the OMRON EE SPY 402. After reading the manual i decided quickly to buy one ( and two more for friends).
Please read the manual and technical details from here.
(https://www.ia.omron.com/products/family/440/specification.html)
The main feature are: Modulated active IR-Sensor. short distance. 5V and NPN that means it could be direct wired to original z-switch connectors
Accidentally i orderd a used one (look@ebay from 5-50€), but a little bit diffrent type EE SPY 412. I got mine for 8Euros on ebay.
Please read the manual and technical details from here.
(https://www.ia.omron.com/products/family/443/specification.html)
The main feature are also : modulated avtive IR-Sensor. short Distance. 5V and NPN and very light weighted.
This is for users with autolevel enabled firmware (I'm a skynet user) . Do all the steps that described in Web to enable autolevel.
(https://3dprint.wiki/reprap/anet/a8/improvement/autobedleveling)
If you use M119 to test the triggering use white paper and look to the buildin LED!!! Triggering on glass bed results in a short flash around a hotspot.
You need one plug from type: JST XHP-3
(https://www.amazon.de/S%C3%A4tze-2-5-3-Pin-Stecker-Stecker-Draht-Buchse/dp/B01DU9OS5K/ref=sr_1_fkmr0_1?s=toys&ie=UTF8&qid=1491909206&sr=1-1-fkmr0&keywords=JST+XH+2.5+3-P
orhttps://www.amazon.de/gp/product/B01DU87NT4/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
)
Instead of use a capazitive,induktive, mechanical sensor like BLTouch you can plug this sensor direct to the ( all the three wires) board.
You didn't need a octocoupler or the two resitors and no additonal 12V needed. Almost just Plug&Play.
Wiring is very easy. Solder 3 small wire (lenght each arround 1m) to the sensor and be careful with temperature (quick with a small solder iron).
Ground to Ground(-); 5V to VCC(+); and Out to Signal. Look here for wiring:https://3dprint.wiki/reprap/anet/a8/improvement/autobedleveling)
I designed a very easy sensor mount. It's equipped with plasic dowels, which fit in the (non-threaded) holes on the lower rear of the slides without screws.
You only need 2x M3 screws and nuts for the sensor to mount .
The nozzle should to be below (1-3mm) the sensor.
I attach my configuration.h from "skynet" . The offset of sensor is X 18mm & Y 45mm
Use at your own risk, be careful and keep hands on the powerswitch while testing :-)
I use the sensor with glass, buildtak, fr4 and carbon bed. No problem at all yet.
Skynet Configuration:
define X_PROBE_OFFSET_FROM_EXTRUDER 18
define Y_PROBE_OFFSET_FROM_EXTRUDER 45
Testresults with Glass Bed:
define Z_MIN_PROBE_REPEATABILITY_TEST
M48 P10 X100 Y100
ecv: Mean: 2.514750 Min: 2.503 Max: 2.520 Range: 0.017
Recv: Standard Deviation: 0.005640
M48 P10 X50 Y50
Mean: 2.431000 Min: 2.425 Max: 2.437 Range: 0.013
Recv: Standard Deviation: 0.003905
M48 P10 X150 Y150
Recv: Finished!
Recv: Mean: 2.454750 Min: 2.450 Max: 2.460 Range: 0.010
Recv: Standard Deviation: 0.003052
Results with 100Celcius Hotbed:
Send: M105
Recv: ok T:150.1 /150.0 B:101.5 /100.0 @:29 B@:127
M48 P10 X100 Y100
Recv: Mean: 1.705250 Min: 1.697 Max: 1.712 Range: 0.015
Recv: Standard Deviation: 0.004931
M48 P10 X50 Y50
Recv: Mean: 1.641500 Min: 1.635 Max: 1.647 Range: 0.012
Recv: Standard Deviation: 0.004213
M48 P10 X150 Y150
Recv: Mean: 1.637250 Min: 1.632 Max: 1.642 Range: 0.010
Recv: Standard Deviation: 0.004100
Edit 2018-11-13
if plasic dowels are broken ( that happens to me) use hot glue to fix the plate