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Without extra spacers, use mini toggle pushbuttons: ample space above 11.75mm (existing 1p12t rotaries, use 11.25mm holes to PCB edge 7.4799999999999995mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 25-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 14.56mm, distance of mounting holes 25mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 37-pin D-Sub connector, solder-cups edge-mounted, female, x-pin-pitch 2.77mm, distance of mounting holes with circular drills, http://www.alps.com/prod/info/E/HTML/Encoder/Incremental/EC12E/EC12E1240405.html Temperature and humidity module, http://akizukidenshi.com/download/ds/aosong/DHT11.pdf Temperature and humidity module Digital Proximity, Ambient Light, RGB and Gesture Sensor (https://docs.broadcom.com/doc/AV02-4191EN DFN Sensor optical IR SST LuminOX Luminescence-based O2 sensor, https://sstsensing.com/wp-content/uploads/2021/08/DS0030rev15_LuminOx.pdf Gas Sensor, 6 pin, https://www.winsen-sensor.com/d/files/semiconductor/mq-6.pdf Sensair S8 Series CO2 sensor, 1kHz PWM output, Modbus, THT co2 gas sensor pwm modbus Sensirion SCD4x QFN, 20 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=332), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 40 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation AD), generated with kicad-footprint-generator Hirose DF13 through hole, DF11-6DP-2DSA, 3 Pins per row (http://www.molex.com/pdm_docs/sd/439151404_sd.pdf), generated with kicad-footprint-generator JST XA series connector, B15B-PH-SM4-TB (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-108-02-xxx-DV-LC, 8 Pins per row (https://www.molex.com/pdm_docs/sd/022057045_sd.pdf), generated with kicad-footprint-generator Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 5566-14A2, example for new part number: 09-65-2068, 6 Pins per row (http://www.molex.com/pdm_docs/sd/431602102_sd.pdf), generated with kicad-footprint-generator Molex Molex 1.00mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact FFC/FPC, 200528-0160, 16 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, FH12-17S-0.5SH, 17 Pins per row (https://www.hirose.com/product/en/products/FH12/FH12-24S-0.5SH(55)/), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 20 Pin, RGY0020A (https://www.ti.com/lit/ds/symlink/txb0108.pdf#page=33 Texas RSE0010A UQFN, 10 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/lfcspcp/cp-10/CP_10_9.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 56 Pin (JEDEC MO-153 Var DA https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator JST PH series connector, BM05B-AUHKS-GA-TB (http://www.jst-mfg.com/product/pdf/eng/eAUH.pdf), generated with kicad-footprint-generator Net tie, 3 pin, 0.5mm square SMD pads Net tie, 4 pin, 0.3mm round THT pads Net tie, 4 pin, 0.3mm round THT.

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