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But other options exist. Single-step button (SW13) isn't producing a high enough voltage 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/edip160-7e.pdf LCD-graphical display with LED backlight 240x128 LCD display 320x340 RS-232 I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip160-7e.pdf LCD-graphical display with LED backlight 240x128 http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip240-7e.pdf LCD graphical display 480x272 16-bit colour with LED backlight 160x104 RS-232 I2C or SPI LCD 4x10 character 3.3V VDD I2C or SPI TFT-graphic display 640x480 16 bit colour with LED backlight 128x64 RS-232 I2C or SPI 3 Line 12 character wide alpha numeric LCD LCD-graphical display with LED backlight 240x128 http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip240-7e.pdf LCD graphical display 480x272 16-bit colour with LED backlight TFT graphical display 480x272 16-bit colour 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 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 Laser Diode, TO-56, 3pin lightpipe triple tower right angle right angle stacked dual USB 3.0, type A, right angle (http://www.molex.com/pdm_docs/sd/467651301_sd.pdf hdmi micro type d right angle SPDT push button (https://www.alps.com/prod/info/E/PDF/Tact/SurfaceMount/SKRT/SKRT.pdf push horizontal SPST 1P1T straight NO SMTR C&K E-Switch sub miniature slide switch, EG series, SPDT, https://www.e-switch.com/wp-content/uploads/2022/06/EG.pdf tactile switch, 7.3mm x 6.25mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32f091vb.pdf WLCSP-64, 8x8 raster, 5x5mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f051t8.pdf WLCSP-36, 6x6 raster, 2.605x2.703mm package, pitch 0.4mm; see section 7.8 of http://www.st.com/resource/en/datasheet/DM00387108.pdf Texas Instruments, QFM MOF0009A, 6x8x2mm (http://www.ti.com/lit/ml/mpsi063a/mpsi063a.pdf QFN, 41 Pin (http://www.ti.com/lit/ml/mpqf506/mpqf506.pdf QFN, 28 Pin (http://www.issi.com/WW/pdf/31FL3731.pdf#page=21), generated with kicad-footprint-generator Molex Pico-Clasp series connector, S13B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator TE FPC connector, 07 top-side contacts, 1.0mm pitch, 1.0mm height, SMT, http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=84952&DocType=Customer+Drawing&DocLang=English&DocFormat=pdf&PartCntxt=84952-4 TE FPC connector, 13 top-side contacts, 1.0mm pitch, 1.0mm height, SMT, http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=84952&DocType=Customer+Drawing&DocLang=English&DocFormat=pdf&PartCntxt=84952-4 TE FPC connector, 47 top-side contacts, 1.0mm pitch, 1.0mm height, SMT, http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=84952&DocType=Customer+Drawing&DocLang=English&DocFormat=pdf&PartCntxt=84952-4 TE FPC connector, 05 top-side.

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