Reporter PCB design

.gitignore

@@ -30,3 +30,7 @@ fp-info-cache
 # Exported BOM files
 *.xml
 *.csv
+
+
+# Ignore pdf datasheets
+datasheets

docs/datasheets.md

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+# Datasheet links
+
+Datasheets can be downloaded in bulk by running `download-datasheets.sh`.
+
+## ESP32 datasheets
+- [ESP32-C3-WROOM-02](https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf)
+- [ESP32-C3](https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf)
+- [ESP32-C3 technical reference manual](https://www.espressif.com/sites/default/files/documentation/esp32-c3_technical_reference_manual_en.pdf)
+
+## User interface
+### LCD
+- [DFRobot Gravity I2C LCD1602 Display module](https://raw.githubusercontent.com/Arduinolibrary/DFRobot_Gravity_I2C_LCD1602_Display_module/master/LCD%20Datasheet.pdf)
+
+### Pushbutton
+- [PS1057ABLK](https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/967/PS1057ABLK.pdf)
+
+### Battery switch
+- [EG1224](https://sten-eswitch-13110800-production.s3.amazonaws.com/system/asset/product_line/data_sheet/119/EG.pdf)
+
+## Phototransistor
+- [ALS-PT204-6C/L177](https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/885/ALS-PT204-6C%2CL177.pdf)
+
+## Misc ICs
+- [LIPO charger](https://ww1.microchip.com/downloads/en/DeviceDoc/MCP73831-Family-Data-Sheet-DS20001984H.pdf)
+- [LDO regulator](https://www.mouser.com/datasheet/2/389/ld39150-1849393.pdf)
+- [MAX40200 power distribution OR controller](https://www.analog.com/media/en/technical-documentation/data-sheets/max40200.pdf)
+
+## LIPOs
+- [350 mAH (for laser)](https://cdn-shop.adafruit.com/product-files/4237/4237_ds_LP552530+350mAh+3.7V.pdf)
+- [2000 mAH (for ESP32 boards)](https://cdn-shop.adafruit.com/datasheets/LiIon2000mAh37V.pdf)
+

docs/download-datasheets.sh

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+#!/usr/bin/env bash
+#
+# Download datasheets that are listed in datasheets.md
+# Right now, only PDF URLs are supported.
+# Datasheet PDFs are not tracked in git.
+
+readarray -t datasheet_urls  < <(grep -E 'https://.*\.pdf' -o datasheets.md)
+
+for pdf in "${datasheet_urls[@]}"; do
+    wget -N --directory-prefix datasheets "${pdf}"
+done

pcb/esp32-boards/README.md

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+# ESP32 wireless photogate hardware
+
+[The KiCAD design files can be viewed online using KiCanvas.](https://kicanvas.org/?github=https%3A%2F%2Fgithub.com%2Ftvannoy%2Flaser-photogate%2Ftree%2Fhardware%2Fpcb%2Fesp32-boards)