SLC Free Wideband Oxygen Sensor Controller Case
Description
This Is A 3D Printed Case For The Open Source And Low Cost Slc Free Wideband O2 Sensor Controller From 14Point7 ( Http://Www.14Point7.Com/Products/Slc-Free ). This Controller Will Connect To A Wideband Oxygen Sensor (Bosch Lsu 4.9 Or Lsu 4.2) And Tell You The Lambda Value (Air To Fuel Ratio) Of Your Exhaust. It Has A Linear Output, As Well As A Narrowband Output, Which Emulates A Narrowband O2 Sensor. I Didn'T Like The Metal Standoffs Included, Nor Having Just A Bare Pcb Exposed While Using It, So I Made This Case. I Strayed A Bit From The Standard Build By Using Different Connectors, So I Included A Middle And Bottom Piece For Lots Of Variations. If You Soldered The Wires Directly As Recommended In The Instructions (Or Used The White Molex Connectors That Weren'T Recommended), Use The _Wires Files. I Used C-Grid Iii (Locking Shrouded) Connectors, Which Surround The Pin And Make Contact On Multiple Sides, Rather Than The Single Sided Connection From The White Molex Connectors... And Housings That Lock Into The Connector. If Using Them, Use The _Cgridiii Files. The Specific Parts I Used Are: 90136-2205 And 90136-2206 (Connectors), 90156-0145 And 90156-0146 (Housings), And 90119-0109 (Crimp Pins). Since They'Re Shrouded, I Had To Install Them On Opposite Sides Of The Board For Them To Fit. I Also Had To Snap Off The Outer Tabs On The Rear Of The Connectors For Extra Clearance Around The Mounting Holes (See The Pics For Details). I Also Installed Connectors For The Programming Header And Additional I/O. If You Want The Programming Header Accessible, Use The _Prog Files, And If You Want Access To The I/O Pins, Use The _Io Files. Note That There Are Several Variants Of Slc Free... A Is Open Source, B And C Are Closed Source. Variant A Only Has A Bar Graph, And Only Works With Lsu 4.9 Sensor, B And C Show The Values In Text, And Are For The Lsu 4.9 And Lsu 4.2 Sensors Respectively. I Included Case Parts For All Three Types... _A Has Labels To Interpret The Bar Graph, _Bc Just Has Lambda And Temperature Labeled. I'M Currently Running Variant B (Seen In The Pictures), Though Have A Spare Chip And Programmer, Which I Plan To Use To Load Variant A (And Possibly Customize The Firmware If I Ever Need It). The Sketchup Model For All These Pieces Is Included As Well.
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