PCB_Project.PrjPcbStructure

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+Record=TopLevelDocument|FileName=Page_turner_top.SchDoc|SheetNumber=1
+Record=SheetSymbol|SourceDocument=Page_turner_top.SchDoc|Designator=U_epaper|SchDesignator=U_epaper|FileName=epaper.SchDoc|SheetNumber=2|SymbolType=Normal|RawFileName=epaper.SchDoc|DesignItemId= |SourceLibraryName= |ObjectKind=Sheet Symbol|RevisionGUID= |ItemGUID= |VaultGUID= 
+Record=SheetSymbol|SourceDocument=Page_turner_top.SchDoc|Designator=U_esp32s3_nano|SchDesignator=U_esp32s3_nano|FileName=esp32s3_nano.SchDoc|SheetNumber=3|SymbolType=Normal|RawFileName=esp32s3_nano.SchDoc|DesignItemId= |SourceLibraryName= |ObjectKind=Sheet Symbol|RevisionGUID= |ItemGUID= |VaultGUID= 

README.md

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+# Page Turner
+
+Page Turner is a battery-powered ESP32 development board, with a lightweight set of sensors connected to an e-Paper display.
+
+![Block Diagram](images/block_diagram.png)
+
+### Goals
+
+- Low-power operation with 6+ mo on a coin-cell battery
+  - 20 cycles per day
+  - Min 4 cycles per day refresh to avoid burn-in
+- Small form-factor
+- Low cost BOM (will be distributed at tradeshows)
+  - $15 @ ~100 qty cost target
+- Temperature + humidity sensing and reporting
+- Header pins available to extend the sensor suite to additional external sensors
+
+### Extended Goals
+
+- External DC power input
+- Extended operating temperature (for outdoor weather monitoring)
+- Physical enclosure
+
+# Resources
+
+Components Library: https://hub.allspice.io/AllSpice/AllSpice-Demo-Library
+
+Reference Designs: https://github.com/unexpectedmaker/esp32s3
+
+# Specifications
+
+-  **Minimum operating temperature**: 0°C
+-  **Maximum operating temperature**: 40°C

components/search/Epaper-display_search.md

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+# Epaper display search
+
+
+## Waveshare
+
+### 2.13" 4-color rectangular
+#### Specs
+- Refresh time 25s
+- Refresh Power < 10mW
+- Standby Current < 0.01uA
+- Color Red/Yellow/Black/White
+- Power 3.3V
+- Interface SPI (3/4 wire)
+- Resolution 250x122 px
+
+#### Power budget
+10 mW refresh for 25s
+P=IV
+10 mW = I * 3.3V
+10 mW / 3.3v = I
+I = 0.00303030303 = 3 mA
+3 mA @ 25 s = 75 mAs
+hour/sec = 1/3600 h/s
+75 mAs * 1/3600 h/s = 75/3600 mAh = 0.02083 mAh
+48 refreshes per mAh
+500 mAh = max 5000 refreshes
+
+
+
+#### Link
+[2.13" 4-color display](https://www.waveshare.com/product/displays/e-paper/epaper-3/2.13inch-e-paper-g.htm)
+[2-color wifi-ble Dev board](https://www.waveshare.com/product/displays/e-paper/epaper-3/2.13inch-e-paper-cloud-module.htm)
+[4-color pi-hat](https://www.waveshare.com/product/displays/e-paper/2.13inch-e-paper-hat-g.htm)
+#### Price
+- 1 $7.99
+- 10 $7.59
+- 50 $7.39
+- 100 $7.31
+
+### 1.64" 4-color display squarish
+
+#### Specs
+- Refresh time 12s
+- Refresh Power < 57mW
+- Standby Current < 0.01uA
+- Color Red/Yellow/Black/White
+- Power 3.3V
+- Interface SPI (3/4 wire)
+- Resolution 250x122 px 
+
+#### Link
+[1.64" 4-color display](https://www.waveshare.com/1.64inch-e-Paper-G.htm)
+#### Price
+
+- 1 $9.99
+- 10 $9.59
+- 50 $9.39
+- 100 $9.31
+
+
+## BuyDisplay
+
+### 1.54" 3-Color Epaper display
+
+#### Link
+[1.54" 3-color display](https://www.buydisplay.com/3-color-1-54-inch-e-paper-152x152-smallest-e-ink-display-panel-spi)
+#### Price
+- Buy 1 US$5.26
+- Buy 10 for US$5.11 each and save 3%
+- Buy 30 for US$4.97 each and save 6%
+- Buy 50 for US$4.82 each and save 8%
+- Buy 100 for US$4.67 each and save 11%
+
+#### Specs
+- Image Update Current I UPDATE - 8.5~10 mA
+- Standby Panel Current I STANDBY - 2 5 uA
+

components/search/Shunt_Kelvin_Resistor_search.md

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+# Shunt Kelvin Resistor
+
+## Option 1
+
+## Stackpole Electronics
+
+### Part Number
+[HCSK1216FTL500](https://www.digikey.com/en/products/detail/stackpole-electronics-inc/HCSK1216FTL500/11565169)
+
+
+### Specs
+- Resistance: .5 mohms
+- Tolerance: 1%
+- Power rating: 2W to 5W continuous power rating at ambient temperatures up to +100°C
+- Physical size: 3.81 x 3.00 x 2.30 mm
+- Kelvin terminations provide 4-pin connection to eliminate lead resistance and improve accuracy
+- 50 ppm TCR 
+
+### Price
+| Qty | Unit $ | EXT $ |
+|---|---|---|
+| 1 | $0.73000 | $0.7310 |
+| 2 | $0.63300 | $6.3325 |
+| 3 | $0.55640 | $13.9150 |
+| 4 | $0.50860 | $25.43100 |
+| 5 | $0.44140 | $44.14250 |
+| 6 | $0.38380 | $95.95500 |
+| 7 | $0.31856 | $159.281,000 |
+| 8 | $0.25906 | $259.06 |
+
+## Option 2
+
+## Bourns Inc.
+
+### Part Number
+[CSS4J-4026R-L200F] (https://www.digikey.com/en/products/detail/bourns-inc/CSS4J-4026R-L200F/16563400)  
+
+### Specs
+- Resistance: .2 mohms
+- Tolerance: 1%
+- Power rating: 10W continuous power rating at ambient temperatures up to +100°C
+- Physical size: 10.06 x 6.60 x 4.00 mm
+- Kelvin terminations provide 4-pin connection 
+- 50 ppm TCR 
+
+### Price
+| QTY | UNIT $ | EXT $ |
+|---|---|---|
+| 1 | $1.57000$1.5710 | 1.5710 |
+| 2 | $1.38900$13.8925 | 13.8925 |
+| 3 | $1.28760$32.1950 | 32.1950 |
+| 4 | $1.21200$60.60100 | 60.60100 |
+| 5 | $1.06050$106.05250 | 106.05250 |
+| 6 | $0.90900$227.25500 | 227.25500 |
+| 7 | $0.75750$378.75 | 378.75 |

components/search/coincell_battery_search.md

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+# Coin Cell Batteries
+
+## CR3032
+
+ [P121-ND](https://www.digikey.com/en/products/detail/panasonic-bsg/CR3032/107126)
+* Nominal voltage: 3 V
+* Nominal capacity: 500 mAh
+* Diameter: 30 mm
+* Height: 3.2 mm
+* Weight: 6.8 g
+* Operating temperature range: -30°C to 85°C
+* Shelf life: 10 years
+* cost: $2.63
+## CR2450
+
+[P340-ND](https://www.digikey.com/en/products/detail/panasonic-bsg/CR2450/447508)
+ 
+* Nominal voltage: 3 V
+* Nominal capacity: 620 mAh
+* Diameter: 24.5 mm
+* Height: 5.0 mm
+* Weight: 5.6 g
+* Operating temperature range: -20°C to 85°C
+* Shelf life: 10 years
+* cost: $1.45
+
+# Search criteria
+- Voltage (>=3)
+- Capacity > 250 mAh
+- constant current > 5 mA (if possible)
+- peak current >= 50 mA (if possible)
+- size >= 3032
+- Height <= 8 mm (if it's taller than this, we could go with Li-Ion cylinders)
+- available in smt/th as well as compatible battery holder. The option to use either would be nice.
+- Price: let's see a spread. It might be worthwhile to have a longer-life option

components/search/esspressif_esp_search.md

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+# Esspressif ESP32 micro/radio search
+
+## Selection criteria
+- Price
+  - $2-3
+    - ESP32-S2
+    - ESP32-C*
+  - $3-4
+    - ESP32-S3
+- Power
+- Module / Dev kits
+- Availability
+
+## Lead contenders
+
+- ESP-WROOM-02
+  - ESP8684-WROOM-02C/02UC
+  - Main selection reasons:
+   - 2.7-3.6V
+   - $3-$3.50
+   - [7-16k in stock](https://octopart.com/search?q=esp-wroom-02&currency=USD&specs=0)
+   - [dev kit](https://octopart.com/search?q=ESP8266-DevKitC&currency=USD&specs=0)
+
+
+## Module Notes
+
+- [Product selector](https://products.espressif.com/#/product-selector?language=en&names=)
+- ESP (classic?) WROOM | Xtensa LX6 micro
+  - 2.7V-3.6V
+    - Having this voltage margin above a coin-cell will improve the life of the device and speed up development/testing
+    - all other modules use 3.0 V min, which is right where most coincells sit. We would have to add step-up regulator, and that will drain more current.
+  - ESP32 WRoom-DA (two complementary antennas)
+  - dev kits
+    - ESP8266-DevKitC-02D-F ESP-WROOM-02D
+    - ESP8266-DevKitC-02U-F ESP-WROOM-02U
+
+- ESP32-S2 Mini/Solo still in production $2-3 (mcu + wifi)
+  - Price: $2-3
+  - Power: Ivdd 0.5A min (too much current draw)
+    - Work mode Description Peak (mA)
+    - Active (RF working)
+      - TX
+        - 802.11b, 20 MHz, 1 Mbps, @19.5 dBm 310mA
+        - 802.11g, 20 MHz, 54 Mbps, @15 dBm 220mA
+        - 802.11n, 20 MHz, MCS7, @13.5 dBm 200mA
+        - 802.11n, 40 MHz, MCS7, @13.5 dBm 160mA
+       - RX 2
+        - 802.11b/g/n, 20 MHz 63
+        - 802.11n, 40 MHz 68
+- ESP32-S2 Wroom / Wrover NRFND (S3 in production)
+- power same as S2
+
+- ESP32-S3 WROOM/Mini $3-4 (mcu/ble/2.4 ghz wifi)
+
+- ESP32-C2 ESP8684-mini $2-3
+  - 13 mA with radio off
+- ESP32-C3 ESP8685-WROOM $2-3
+  - 17-22mA with modem off
+  - deep sleep RTC counter 5 uA
+- ESP32-C6 Mini $2.50-$3
+  - deep sleep 5 uA
+- ESP32-H2 Mini/WROOM no stock
+
+
+
+- ESP8266 WROOM $3+
+

readme.md

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-![new repo](./images/new_repo.png)
-
-# Welcome
-
-Welcome to your new repo. This is your readme.md file.
-
-
-## You can edit this file and add information and specifications about your project
-
- - [ ]  1 pA accuracy
- - [ ]  weight < 2.5 kg