Initial Development #26
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Record=TopLevelDocument|FileName=Page_turner_top.SchDoc|SheetNumber=1
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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=
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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=
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# Page Turner
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Page Turner is a battery-powered ESP32 development board, with a lightweight set of sensors connected to an e-Paper display.
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![Block Diagram](images/block_diagram.png)
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### Goals
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- Low-power operation with 6+ mo on a coin-cell battery
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- 20 cycles per day
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- Min 4 cycles per day refresh to avoid burn-in
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- Small form-factor
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- Low cost BOM (will be distributed at tradeshows)
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- $15 @ ~100 qty cost target
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- Temperature + humidity sensing and reporting
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- Header pins available to extend the sensor suite to additional external sensors
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### Extended Goals
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- External DC power input
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- Extended operating temperature (for outdoor weather monitoring)
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- Physical enclosure
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# Resources
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Components Library: https://hub.allspice.io/AllSpice/AllSpice-Demo-Library
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Reference Designs: https://github.com/unexpectedmaker/esp32s3
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# Specifications
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- **Minimum operating temperature**: 0°C
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- **Maximum operating temperature**: 40°C
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# Epaper display search
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## Waveshare
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### 2.13" 4-color rectangular
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#### Specs
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- Refresh time 25s
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- Refresh Power < 10mW
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- Standby Current < 0.01uA
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- Color Red/Yellow/Black/White
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- Power 3.3V
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- Interface SPI (3/4 wire)
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- Resolution 250x122 px
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#### Power budget
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10 mW refresh for 25s
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P=IV
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10 mW = I * 3.3V
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10 mW / 3.3v = I
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I = 0.00303030303 = 3 mA
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3 mA @ 25 s = 75 mAs
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hour/sec = 1/3600 h/s
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75 mAs * 1/3600 h/s = 75/3600 mAh = 0.02083 mAh
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48 refreshes per mAh
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500 mAh = max 5000 refreshes
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#### Link
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[2.13" 4-color display](https://www.waveshare.com/product/displays/e-paper/epaper-3/2.13inch-e-paper-g.htm)
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[2-color wifi-ble Dev board](https://www.waveshare.com/product/displays/e-paper/epaper-3/2.13inch-e-paper-cloud-module.htm)
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[4-color pi-hat](https://www.waveshare.com/product/displays/e-paper/2.13inch-e-paper-hat-g.htm)
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#### Price
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- 1 $7.99
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- 10 $7.59
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- 50 $7.39
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- 100 $7.31
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### 1.64" 4-color display squarish
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#### Specs
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- Refresh time 12s
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- Refresh Power < 57mW
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- Standby Current < 0.01uA
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- Color Red/Yellow/Black/White
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- Power 3.3V
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- Interface SPI (3/4 wire)
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- Resolution 250x122 px
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#### Link
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[1.64" 4-color display](https://www.waveshare.com/1.64inch-e-Paper-G.htm)
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#### Price
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- 1 $9.99
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- 10 $9.59
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- 50 $9.39
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- 100 $9.31
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## BuyDisplay
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### 1.54" 3-Color Epaper display
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#### Link
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[1.54" 3-color display](https://www.buydisplay.com/3-color-1-54-inch-e-paper-152x152-smallest-e-ink-display-panel-spi)
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#### Price
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- Buy 1 US$5.26
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- Buy 10 for US$5.11 each and save 3%
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- Buy 30 for US$4.97 each and save 6%
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- Buy 50 for US$4.82 each and save 8%
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- Buy 100 for US$4.67 each and save 11%
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#### Specs
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- Image Update Current I UPDATE - 8.5~10 mA
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- Standby Panel Current I STANDBY - 2 5 uA
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# Shunt Kelvin Resistor
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## Option 1
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## Stackpole Electronics
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### Part Number
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[HCSK1216FTL500](https://www.digikey.com/en/products/detail/stackpole-electronics-inc/HCSK1216FTL500/11565169)
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### Specs
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- Resistance: .5 mohms
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- Tolerance: 1%
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- Power rating: 2W to 5W continuous power rating at ambient temperatures up to +100°C
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- Physical size: 3.81 x 3.00 x 2.30 mm
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- Kelvin terminations provide 4-pin connection to eliminate lead resistance and improve accuracy
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- 50 ppm TCR
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### Price
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| Qty | Unit $ | EXT $ |
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|---|---|---|
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| 1 | $0.73000 | $0.7310 |
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| 2 | $0.63300 | $6.3325 |
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| 3 | $0.55640 | $13.9150 |
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| 4 | $0.50860 | $25.43100 |
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| 5 | $0.44140 | $44.14250 |
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| 6 | $0.38380 | $95.95500 |
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| 7 | $0.31856 | $159.281,000 |
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| 8 | $0.25906 | $259.06 |
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## Option 2
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## Bourns Inc.
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### Part Number
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[CSS4J-4026R-L200F] (https://www.digikey.com/en/products/detail/bourns-inc/CSS4J-4026R-L200F/16563400)
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### Specs
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- Resistance: .2 mohms
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- Tolerance: 1%
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- Power rating: 10W continuous power rating at ambient temperatures up to +100°C
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- Physical size: 10.06 x 6.60 x 4.00 mm
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- Kelvin terminations provide 4-pin connection
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- 50 ppm TCR
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### Price
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| QTY | UNIT $ | EXT $ |
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|---|---|---|
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| 1 | $1.57000$1.5710 | 1.5710 |
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| 2 | $1.38900$13.8925 | 13.8925 |
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| 3 | $1.28760$32.1950 | 32.1950 |
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| 4 | $1.21200$60.60100 | 60.60100 |
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| 5 | $1.06050$106.05250 | 106.05250 |
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| 6 | $0.90900$227.25500 | 227.25500 |
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| 7 | $0.75750$378.75 | 378.75 |
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# Coin Cell Batteries
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## CR3032
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[P121-ND](https://www.digikey.com/en/products/detail/panasonic-bsg/CR3032/107126)
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* Nominal voltage: 3 V
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* Nominal capacity: 500 mAh
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* Diameter: 30 mm
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* Height: 3.2 mm
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* Weight: 6.8 g
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* Operating temperature range: -30°C to 85°C
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* Shelf life: 10 years
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* cost: $2.63
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## CR2450
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[P340-ND](https://www.digikey.com/en/products/detail/panasonic-bsg/CR2450/447508)
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* Nominal voltage: 3 V
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* Nominal capacity: 620 mAh
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* Diameter: 24.5 mm
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* Height: 5.0 mm
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* Weight: 5.6 g
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* Operating temperature range: -20°C to 85°C
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* Shelf life: 10 years
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* cost: $1.45
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# Search criteria
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- Voltage (>=3)
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- Capacity > 250 mAh
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- constant current > 5 mA (if possible)
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- peak current >= 50 mA (if possible)
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- size >= 3032
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- Height <= 8 mm (if it's taller than this, we could go with Li-Ion cylinders)
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- available in smt/th as well as compatible battery holder. The option to use either would be nice.
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- Price: let's see a spread. It might be worthwhile to have a longer-life option
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# Esspressif ESP32 micro/radio search
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## Selection criteria
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- Price
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- $2-3
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- ESP32-S2
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- ESP32-C*
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- $3-4
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- ESP32-S3
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- Power
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- Module / Dev kits
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- Availability
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## Lead contenders
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- ESP-WROOM-02
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- ESP8684-WROOM-02C/02UC
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- Main selection reasons:
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- 2.7-3.6V
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- $3-$3.50
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- [7-16k in stock](https://octopart.com/search?q=esp-wroom-02¤cy=USD&specs=0)
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- [dev kit](https://octopart.com/search?q=ESP8266-DevKitC¤cy=USD&specs=0)
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## Module Notes
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- [Product selector](https://products.espressif.com/#/product-selector?language=en&names=)
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- ESP (classic?) WROOM | Xtensa LX6 micro
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- 2.7V-3.6V
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- Having this voltage margin above a coin-cell will improve the life of the device and speed up development/testing
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- 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.
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- ESP32 WRoom-DA (two complementary antennas)
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- dev kits
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- ESP8266-DevKitC-02D-F ESP-WROOM-02D
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- ESP8266-DevKitC-02U-F ESP-WROOM-02U
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- ESP32-S2 Mini/Solo still in production $2-3 (mcu + wifi)
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- Price: $2-3
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- Power: Ivdd 0.5A min (too much current draw)
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- Work mode Description Peak (mA)
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- Active (RF working)
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- TX
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- 802.11b, 20 MHz, 1 Mbps, @19.5 dBm 310mA
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- 802.11g, 20 MHz, 54 Mbps, @15 dBm 220mA
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- 802.11n, 20 MHz, MCS7, @13.5 dBm 200mA
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- 802.11n, 40 MHz, MCS7, @13.5 dBm 160mA
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- RX 2
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- 802.11b/g/n, 20 MHz 63
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- 802.11n, 40 MHz 68
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- ESP32-S2 Wroom / Wrover NRFND (S3 in production)
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- power same as S2
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- ESP32-S3 WROOM/Mini $3-4 (mcu/ble/2.4 ghz wifi)
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- ESP32-C2 ESP8684-mini $2-3
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- 13 mA with radio off
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- ESP32-C3 ESP8685-WROOM $2-3
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- 17-22mA with modem off
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- deep sleep RTC counter 5 uA
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- ESP32-C6 Mini $2.50-$3
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- deep sleep 5 uA
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- ESP32-H2 Mini/WROOM no stock
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- ESP8266 WROOM $3+
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Reference in New Issue