BIQ Opto Endstop

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Revision as of 09:52, 17 December 2011 by Bodgeit (talk | contribs) (Building 3 Iluminated PCBs)
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BIQ Opto Endstop

Release status: working

Revision 0.1
CAD Models
External Link



RepRap compatible Opto End-stop using an Opto End stop with a 0.5mm beam slightly smaller than the HB102 beam width of 0.8mm.

The opening of the interrupter is 5mm allowing for a 3mm black perspex interrupter tag designed for use on Huxley Seedling but can be used on All RepRaps.

The output of all three versions is an Open collector active High signal.

Active high means a 1 is made when the end-stop is triggered.

Project goal was to Design:

A small low cost PCB < £1.00 for 3 bare PCBS.

Low cost of components.

With a smaller beam to break.

Wider opening for a 3mm interrupter and little more clearance.

Three circuit build configurations. ECO, standard, and Illuminated.

Reprap Standard mounting centres. (holes)

PCB size is 25.5mm x 10mm metric or 1.004" x 0.394" in Imperial

Get It!

Full Kits

Master Schematic of board

CCT BiQoptofull.png

Master CCT of the PCB.


You will be able to once I have made them and uploaded them. = to download the electronics files from GitHub BIQ Opto Endstop.

This file contains the following:

   PDF files of the schematic, copper layers, and silkscreen
   Eagle source files for modification


ECO Schematic

(easy to build Discreet components)

The Led is on all the time for setting up your end-stops.

Once the RepRap is set-up the link can be removed as you do not need to see the led going off/on.

In the same way your scanner or paper printer has not got a Led on its end stops.

An open collector drive gives better noise immunity.

(however adding a 10K surface mount pull up resistor is an option.)

CCT BiQoptoeco.png

Standard Schematic

(more difficult to build Discreet components with one Surface mount resistor)

The Led is off all the time and is only activated when the end stop is triggered.

This gives the same function as most of the other RepRap end stops.

CCT BiQoptostd.png

Illuminated Schematic

(difficult to build Discreet components with two Surface mount resistors)

The Led is slightly on all the time and brightens when the end stop is triggered.

Its function can also be enabled and disabled by the link.

An open collector drive gives better noise immunity.

(however adding a 10K surface mount pull up resistor is an option.)

CCT BiQoptoillu.png


Components ECO

CCT BiQoptoeco.jpg

Components STD

CCT BiQoptostd.jpg

Components Iliminated

CCT BiQoptoillu.jpg

For illuminated version use the 470 ohm resistors.

For the Gen7 style circuit use the 1k and 2.2k resistors..

Soldering Instructions

Building 3 ECO PCBs

CCT BiQoptoeco1.jpg

Solder 3 220 ohm resistors on the 3 boards

CCT BiQoptoeco2.jpg

Solder 3 450-470 ohm resistors on the 3 boards

CCT BiQoptoeco3.jpg

place the 3mm Leds in position with the long led wire on the right side.

Stop and double check before you solder them the D shape of the plastic is how you write a D

CCT BiQoptoeco4.jpg

Solder the 2 pin header at 45 degrees like a forward slash the left hole is marked with a circle and a line

CCT BiQoptoeco5.jpg

Double sided plated through PCBs are difficult to re-adjust once all the pins are soldered.

Place the Opto devices in their positions Matching the S on the device to the S printed on the PCB.

Before you solder check that the chamfered edge is near the middle of the board.

Then Solder the 2 pins near the bottom edge of the board.

Check the Opto devices are square and level before soldering the inner two pins.

Building 3 STD PCBs

CCT BiQoptostd1.jpg

CCT BiQoptostd2.jpg

CCT BiQoptostd3.jpg

CCT BiQoptostd4.jpg

Building 3 Iluminated PCBs

CCT BiQoptoillu1.jpg

Place the 470 ohm or 1K surface mount resistor but only solder the end nearest the opto interrupter.

CCT BiQoptoillu2.jpg

Now fit the 470 ohm or 2.2K axial resistor as shown once fitted you can solder the other end of the Surface mount resistor. CCT BiQoptoillu3.jpg

CCT BiQoptoillu4.jpg

CCT BiQoptoillu5.jpg

CCT BiQoptoillu6.jpg

CCT BiQoptoillu7.jpg

To be updated with BOMs, more files and more build pictures.

The pictures bellow show how I've managed to get the price per PCB down to a more sensible price point for an End stop.

These boards are know as Panellised PCBS the main reason for panelling them is the small size of each board

BIQOptoendstop2.jpg.jpg BIQOptoendstop3.jpg.jpg