Proximity Camera Board Design

flux

I’ll add a single-cell LiPo power path: USB-C charges the battery, the board can run from battery when USB is absent, and the existing 3.3 V rail will be updated so it can accept the battery source safely. I’ll size it against the existing ESP32/camera peak load, then wire and re-run ERC.

flux

I started the LiPo battery upgrade and inspected the existing power path: USB-C VBUS currently feeds a PAM2305 fixed 3.3 V buck regulator, which powers the ESP32-S3, camera, and VCNL4040 on 3V3.
Important finding: a single-cell LiPo ranges about 4.2 V down to ~3.0 V, so the current buck-only 3.3 V regulator is not ideal for full battery operation. The right architecture is:
  • USB-C 5 V → single-cell LiPo charger / power-path IC
  • LiPo battery connector → charger BAT pin
  • charger SYS/output → 3.3 V buck-boost regulator
  • buck-boost output → existing 3V3 rail
I was blocked by project credits before I could add parts or wire the schematic. Remaining work:
  1. Select charger/power-path IC, likely BQ24074/MCP73871-class.
  2. Select 3.3 V buck-boost regulator rated for ESP32-S3 + camera peak current.
  3. Add JST LiPo connector, charger passives, battery thermistor/program resistor as required.
  4. Replace or bypass the existing PAM2305 buck with the buck-boost stage.
  5. Update power-budget notes and rerun ERC to zero unresolved violations.
Use BQ24074
Compare charger ICs
Find battery connector
Calculate peak current
Document power architecture
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
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  • Generic Capacitor
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    jharwinbarrozo
    1.5M
  • Generic Resistor
    Generic Resistor
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    1.5M
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    Ground
    A common return path for electric current. Commonly known as ground.
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    20.5M
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    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
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  • RMCF0805JT47K0
    RMCF0805JT47K0
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    1.2M
  • 875105359001
    875105359001
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  • CTL1206FYW1T
    CTL1206FYW1T
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    jharwinbarrozo
    1.1M
  • 1070TR
    1070TR
    Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
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ESP32-S3 Proximity Camera

ESP32-S3 Proximity Camera thumbnail
WiFi-enabled ESP32-S3 camera board with proximity-triggered wake/hold detection. Captures and uploads an image to a server when a person/object remains nearby for 3 seconds.

Properties

Properties describe core aspects of the project.

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