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To trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a 7-segment display with LED backlight 128x64 RS-232 I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip128-6e.pdf LCD-graphical display with LED backlight 128x64 RS-232 I2C or SPI 3 Line 12 character wide alpha numeric LCD LCD-graphical display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100AQ for QRE1113, see https://www.onsemi.com/pub/Collateral/QRE1113-D.PDF OnSemi CASE 100CY, light-direction upwards, see http://www.kodenshi.co.jp/products/pdf/sensor/photointerrupter_ref/SG-105.pdf package for Siemens SFH900 reflex photo interrupter/coupler/object detector, see https://www.batronix.com/pdf/sfh900.pdf Siemens SFH900 reflex photo interrupter/coupler/object detector, see https://www.batronix.com/pdf/sfh900.pdf Siemens SFH900 reflex photo interrupter/coupler/object detector, see https://www.batronix.com/pdf/sfh900.pdf Siemens SFH900 reflex photo interrupter SMD PhotoDiode, plastic SMD SmatDIL Resistor, LDR 20mm diameter, pin pitch 10.16mm 0.25W = 1/4W, length*diameter=6.3*2.5mm^2, http://cdn-reichelt.de/documents/datenblatt/B400/1_4W%23YAG.pdf Resistor Axial_DIN0516 series Axial Horizontal pin pitch 5.00mm diameter 5.1mm width 3.2mm Capacitor C, Rect series, Radial, pin pitch=37.60mm, , diameter=41.9mm, Vishay, TJ7, http://www.vishay.com/docs/34079/tj.pdf L_Toroid Vertical series Radial pin pitch 2.50mm diameter 6.3mm height 7mm with pitch 10mm length 3.8mm diameter 2.6mm C, Axial series, Axial, Vertical, pin pitch=3.81mm, , length*diameter=9.5*5.2mm^2, , http://www.diodes.com/_files/packages/DO-201AD.pdf Diode DO-201AD series Axial Horizontal pin pitch 7.62mm length 20mm diameter 9mm Resistor, Axial_Power series, Box, pin pitch=45.72mm, 7W, length*width*height=38*6.4*6.4mm^3, http://cdn-reichelt.de/documents/datenblatt/B400/5WAXIAL_9WAXIAL_11WAXIAL_17WAXIAL%23YAG.pdf Resistor Axial_Power series Box pin pitch 30.48mm 5W length 20mm diameter 13mm Electrolytic Capacitor CP, Radial series, Radial, pin pitch=5.00mm, , length*width=7*4.5mm^2, Capacitor C Radial series Radial pin pitch 22.50mm length 24mm width 10.9mm Capacitor C, Rect series, Radial, pin pitch=7.50mm, , length*width=9*2.6mm^2, Capacitor, https://en.tdk.eu/inf/20/20/db/fc_2009/MKT_B32560_564.pdf C Rect series Radial pin pitch 25mm length 19mm diameter 7.5mm C, Axial series, Axial, Horizontal, pin pitch=12.7mm, , length*diameter=7.62*9.53mm^2, , http://www.diodes.com/_files/packages/8686949.gif Diode 5KPW series Axial Horizontal pin pitch 43mm length 37mm diameter 20mm Electrolytic Capacitor C, Rect series, Radial, pin pitch=5.00mm, , diameter*width=7.5*4.4mm^2, Capacitor C Rect series Radial pin pitch 28.80mm diameter.

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