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Modbus, THT co2 gas sensor pwm modbus Sensirion SCD4x QFN, 20 Pin (JEDEC MO-153 Var DA https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 5273-09A example for new part number: 09-65-2058, 5 Pins (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=826576&DocType=Customer+Drawing&DocLang=English), generated with kicad-footprint-generator JST XA series connector, 502585-0770 (http://www.molex.com/pdm_docs/sd/5025850270_sd.pdf), generated with kicad-footprint-generator Tantalum Capacitor SMD 2225 (5664 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://www.kemet.com/Lists/ProductCatalog/Attachments/253/KEM_TC101_STD.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55932-1010, with PCB cutout, light-direction upwards, see http://www.onsemi.com/pub/Collateral/QRE1113-D.PDF PhotoDiode, plastic SMD DIL, 4.5x4mm² PhotoDiode plastic SMD SmatDIL Resistor, LDR D=6.4mm, see http://yourduino.com/docs/Photoresistor-5516-datasheet.pdf Sharp OPIC IS485.

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