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Footprints whenever possible; some fabs charge more for ovals avoid non-circular holes in footprints whenever possible; some fabs charge more for ovals PCB layout: [front](Docs/precadsr_layout_front.pdf), [back](Docs/precadsr_layout_back.pdf) * [BOM](Docs/precadsr_bom.md) * [Build notes](Docs/build.md) How to use for the Adafruit Feather WICED Wifi 32-bit microcontroller module with integral chip antenna (http://ww1.microchip.com/downloads/en/DeviceDoc/60001380C.pdf Cypress EZ-BLE PRoC Module (Bluetooth Smart) 21 Pin Module Digi XBee SMT RF ESP WROOM-02 espressif esp8266ex 2.4 GHz Wi-Fi and Bluetooth combo chip https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf Single 2.4 GHz Wi-Fi https://www.espressif.com/sites/default/files/documentation/esp32-s2-wroom_esp32-s2-wroom-i_datasheet_en.pdf 2.4 GHz Wi-Fi and Bluetooth module, https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf 2.4 GHz Wi-Fi Bluetooth external antenna espressif 20*15.4mm 2.4 GHz Wi-Fi and Bluetooth combo chip, external antenna, https://www.espressif.com/sites/default/files/documentation/esp32-s3-mini-1_mini-1u_datasheet_en.pdf 2.4 GHz Wi-Fi and Bluetooth module ESP32-D0WD Espressif ESP32-WROOM-32E 2.4 GHz Wi-Fi and Bluetooth module Single 2.4 GHz Wi-Fi and Bluetooth module https://www.espressif.com/sites/default/files/documentation/esp32-s3-wroom-1_wroom-1u_datasheet_en.pdf 2.4 GHz Wi-Fi and Bluetooth combo chip https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf Single 2.4 GHz Wi-Fi and Bluetooth combo chip https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf Single 2.4 GHz Wi-Fi and Bluetooth combo chip with U.FL connector, https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf D52M ANT SoC Module https://www.thisisant.com/assets/resources/D00001687_D52_Module_Datasheet.v.2.3_(Garmin).pdf RF SoC Radio ANT Bluetooth BLE D52 nRF52 Garmin Canada Dynastream Nordic Low Power Long Range Transceiver Module Low Power Long Range Transceiver Module SMD-16 (https://www.hoperf.com/data/upload/portal/20181127/5bfcbea20e9ef.pdf LoRa Low Power Long Range LoRa Transceiver Module SMD-16 (https://www.hoperf.com/data/upload/portal/20181127/5bfcbea20e9ef.pdf LoRa Low Power Long Range Transceiver Module SMD-16 (https://www.hoperf.com/data/upload/portal/20181127/5bfcbea20e9ef.pdf LoRa Low Power Long Range Transceiver Module LoRa Radio, RF, Module, http://www.hoperf.com/upload/rf/RFM69HW-V1.3.pdf 8 pin package (http://datasheet.octopart.com/ZDT6758TA-Zetex-datasheet-68057.pdf Diodes Incorporated PowerDI3333-8 UXC, 3.05x3.05x0.8mm Body, https://www.diodes.com/assets/Package-Files/PowerDI3333-8%20(Type%20UXC).pdf Infineon, PG-TDSON-8, 6.15x5.15x1mm, https://www.infineon.com/dgdl/Infineon-BSC520N15NS3_-DS-v02_02-en.pdf?fileId=db3a30432239cccd0122eee57d9b21a4 X1SON 2 pin Molex header 2.54 mm spacing Q1, Q2, Q3 | 3 | 100R | Resistor | | | Tayda | A-827 | | J5, J12, J13 | 3 | A1M | \*\*Potentiometer, 16 mm vertical board mount. Only 16 mm vertical board mount module ACDC-Converter, Murata, 5W, ClassB, https://www.murata.com/products/productdata/8809982558238/KAC-BAC05.pdf switching power supply tht Constant current LED Driver DC/DC Converter, https://g.recomcdn.com/media/Datasheet/pdf/.fYUQjOlW/.t2a80a771bdbb0ef300f7/Datasheet-93/RCD-24.pdf DCDC-Converter, 30W POE, Silvertel, pitch 2.54mm, package size 11.5x8.5x17.5mm^3, https://www.recom-power.com/pdf/Innoline/R-78Bxx-2.0.pdf dc-dc recom buck sip-4 pitch 2.54mm length 7mm width 6mm Capacitor C, Rect series, Radial, pin pitch=7.50mm, , diameter*width=12.5*5.0mm^2, Capacitor, http://www.vishay.com/docs/28535/vy2series.pdf C Disc series Radial pin pitch 33.27mm diameter 50.8mm Vishay IHB-6 Inductor, Radial series, Radial, pin pitch=10.00mm, , diameter=35mm, Electrolytic Capacitor, , http://www.vishay.com/docs/42037/53d.pdf CP Axial series Axial Horizontal pin pitch 48mm length 40mm diameter 16mm Electrolytic Capacitor C Rect series Radial pin pitch 7.50mm length 9mm diameter 5.3mm Diode, DO-201 series, Axial, Horizontal, pin pitch=15.24mm, , length*diameter=14*4.5mm^2, Fastron, LACC, http://www.fastrongroup.com/image-show/20/LACC.pdf?type=Complete-DataSheet&productType=series Inductor Axial series Axial Horizontal pin pitch 35mm length 29mm width 7.6mm Vishay TJ3 L_Toroid, Horizontal series, Radial, pin pitch=3.00mm, , diameter=7mm, http://www.abracon.com/Magnetics/radial/AIUR-16.pdf Inductor Radial series Radial pin pitch.

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