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Below exposed pad; keepout area marked (Package see: https://store.invensense.com/datasheets/invensense/MPU9250REV1.0.pdf; See also https://www.invensense.com/wp-content/uploads/2015/02/InvenSense-MEMS-Handling.pdf 24-Lead Plastic Shrink Small Outline Narrow Body (QR)-.150" Body [QSOP] (see Microchip Packaging Specification 00000049BS.pdf 80-Lead Plastic Thin Quad Flat, No Lead Package (MF) - 3.3x3.3x1 mm Body [DFN-S] (see Microchip Packaging Specification 00000049BS.pdf TQFP, 100 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/tqfp_edsv/sv_100_4.pdf), generated with kicad-footprint-generator Harting har-flexicon series connector, SM03B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator JST XH series connector, 501331-1407 (http://www.molex.com/pdm_docs/sd/5013310207_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-113-02-xxx-DV, 13 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator 4UCON 10156 Card edge socket with amplifier to handle weaker (<6v) signals Sequencer cascading to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a 7-segment 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 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 Kodenshi SG-105F, see http://www.kodenshi.co.jp/products/pdf/sensor/photointerrupter_ref/SG-105F.pdf package for Everlight ITR1201SR10AR, light-direction upwards, see https://www.everlight.com/file/ProductFile/ITR1201SR10AR-TR.pdf reflective opto couple photo coupler package for Kodenshi SG-105 with PCB locator, 9 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-122-02-xx-DV-PE-LC, 22 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-139-02-xxx-DV-LC, 39 Pins per row (http://www.molex.com/pdm_docs/sd/431600105_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M2, height 2.5, Wuerth electronics 9776070960 (https://katalog.we-online.com/em/datasheet/9776070960.pdf), generated with kicad-footprint-generator Molex LY 20 series connector, LY20-8P-DLT1, 4 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ038187.pdf), generated with kicad-footprint-generator Soldered wire connection, for a.

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