Schematic for Architectural Lavender Translation Collar:...

ESP32 Low-Power Circuit Design

flux

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Work completed

Components added:
- U2
- J1
- U3
- U4, U5, U6
- CC pull-down resistors for USB-C: R1, R2
- 27 Ω series resistors on D+/D−: R3, R4
- TVS diodes: D2, D3
- RF PI-match network: L1, C1, C2
- Decoupling capacitors: C3, C4
- I2C pull-ups: R5, R6
- Right-angle JST-PH 2-pin connector
- Programming/debug header
Nets wired:
- SPI (MOSI/MISO/SCK/CS) and IRQ between ESP32-S3 and RFM95W
- RF output → PI-match → antenna-select circuit
- USB D+/D− through 27 Ω series resistors to USB4105 data pins; CC1/CC2 through pull-downs; VBUS through TVS to charger VIN
- Battery → protection → buck regulator → 3.3 V rail → ESP32-S3 and load-switch inputs
- Load-switch enables driven by ESP32-S3 GPIOs
- I2C pull-ups tied to 3.3 V rail and SDA/SCL
- ESP32-S3 BOOT/EN/UART lines to debug header

Tasks not completed or requiring your action

Add the USB-C receptacle footprint (we can’t place that automatically)
Connect ESP32-S3 EN pin to the debug header EN pin
Connect the RF ESD diode input to the selectable antenna circuit output
Connect the USB-C VBUS pins to the battery/charger power net
Fetch and review ERC/DRC results using the @review tool

Success criteria status

All components are present and most nets are wired—but the USB-C footprint and several critical connections remain incomplete.
ERC/DRC have not yet been run; we cannot confirm the design fully passes rules checks.
RF matching network and power management appear correct except for missing ESD diode routing and VBUS net.

Recommended next step Please add the USB-C connector footprint and complete the remaining connections (EN pin, RF ESD diode, VBUS net), then run ERC/DRC. Once the schematic is error-free, we can proceed to PCB layout.

3 days

Needs more info.

Show Plan

U2 ANT - L1 P1

J1 VBUS - D3 1

Capacitance

100nF

U3 FB/VO - U1 3V3

Resistance

4.7k Ω

Capacitance

1.8pF

Inductance

15n H

U2 ANT - L1 P1

U3 FB/VO - U1 3V3

U2 DIO0 - U1 IO26

U3 FB/VO - U1 3V3

Capacitance

1.8pF

U3 FB/VO - U1 3V3

Reviews

Electrical Rule Checks

Duplicate Designators

Reports components with identical designators.

No-Connect Violation

Reports no-connect pins that are connected.

Missing Power • 1

	Component
	USB4105-GF-A-120 J1

Single Pin Nets

Reports nets that have only one pin connected.

Missing Designator

Reports components without a designator.

Design Rule Checks

Overlapping Copper

Reports copper elements that are shorting.

Invalid Layer

Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.

Component Overrides

Reports components that have been modified using the "!important" flag.

Airwires • 27

	Designators	Net
	R6:P1, R5:P1	3V3
	R6:P1, U6:IN	3V3
	U1:3V3, U3:FB/VO	3V3
	U4:IN, U6:IN	3V3
	U5:IN, U3:FB/VO	3V3
	U5:IN, U4:IN	3V3
	R2:P1, J1:CC2	CC2
	U2:DIO0, U1:IO26	DIO0
	U4:SET, U1:IO17	EN_U4
	U5:SET, U1:IO18	EN_U5
	U6:SET, U1:IO21	EN_U6
	U2:MISO, U1:IO12	MISO
	U2:MOSI, U1:IO13	MOSI
	U2:NSS, U1:IO15	NSS
	L1:P2, L1:P1	RF_IN
	U2:ANT, L1:P1	RF_IN
	U2:SCK, U1:IO14	SCK
	J1:DN1, R4:P1	USB_D-
	J1:DN2, J1:DN1	USB_D-
	J1:DN2, U1:IO19	USB_D-
	R4:P2, R4:P1	USB_D-
	J1:DP1, J1:DP2	USB_DP
	J1:DP2, R3:P2	USB_DP
	U1:IO20, R3:P1	USB_DP
	J1:VBUS__1, J1:VBUS	VBUS
	J1:VBUS__1, U3:VIN_A	VBUS
	U3:VIN_A, D3:1	VBUS

Layers with Multiple Fills

Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.

Floating Copper • 1

	Name
	Copper Fill Island, Via-Island-0, Via-2-2, Via-3-2, Via-4-2, Via-1-2, Via-5-2, Via-1-1, Via-4-1, Via-2-1, Via-3-1, Via-4-3, Via-3-3, Via-2-3, Via-2-4, Via-5-4, Via-3-4, Via-4-4, Via-1-4, Via-5-5, Via-4-5, Via-2-6, Via-2-5, Via-3-6, Via-1-6, Via-5-6, Via-4-6, Via-1-5, Via-3-5, Via-7-1, Via-5-1, Via-9-1, Via-8-1, Via-6-1, Via-9-2, Via-8-2, Via-6-2, Via-7-2, Via-9-3, Via-8-3, Via-7-3, Via-6-3, Via-5-3, Via-8-4, Via-10-3, Via-6-4, Via-9-4, Via-10-5, Via-9-6, Via-8-6, Via-7-5, Via-6-6, Via-7-6, Via-6-5, Via-10-6, Via-9-5, Via-10-4, Via-10-1, Via-10-2

Name

Copper Fill Island, Via-Island-0, Via-2-2, Via-3-2, Via-4-2, Via-1-2, Via-5-2, Via-1-1, Via-4-1, Via-2-1, Via-3-1, Via-4-3, Via-3-3, Via-2-3, Via-2-4, Via-5-4, Via-3-4, Via-4-4, Via-1-4, Via-5-5, Via-4-5, Via-2-6, Via-2-5, Via-3-6, Via-1-6, Via-5-6, Via-4-6, Via-1-5, Via-3-5, Via-7-1, Via-5-1, Via-9-1, Via-8-1, Via-6-1, Via-9-2, Via-8-2, Via-6-2, Via-7-2, Via-9-3, Via-8-3, Via-7-3, Via-6-3, Via-5-3, Via-8-4, Via-10-3, Via-6-4, Via-9-4, Via-10-5, Via-9-6, Via-8-6, Via-7-5, Via-6-6, Via-7-6, Via-6-5, Via-10-6, Via-9-5, Via-10-4, Via-10-1, Via-10-2

Protected Intrusions

Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.

Missing Footprints

Reports components that need a footprint but don't have one.

Manufacturing

Manufacturer Part Number

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Parts Available

Beta

Checks that all components are available from distributors.

System Checks

Auto-Layout

Beta

Reports issues with Auto-Layout if Flux cannot route something or must ignore a configuration.

Passive Components

Resistor Power Rating

Beta

Checks that the power traveling across a given resistor is under its rating with 50% headroom.

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Pull Up/Pull Down Presence

Beta

Checks that IC pins that require pull up or pull down resistors have them.

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Capacitor Voltage Rating

Beta

Checks that capacitors have appropriate voltage ratings to prevent overheating and ensure reliable circuit operation.

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
jharwinbarrozo
15.1k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

Inspect

Architectural Lavender Translation Collar

Description

Architectural Lavender Translation Collar – ESP32‑S3 Wi‑Fi + LoRa, USB‑C, Li‑ion, low‑power design

Overview
Experience a cutting-edge IoT solution with this low‑power board built around the ESP32‑S3‑MINI‑1‑N8. Designed for seamless Wi‑Fi (2.4 GHz), BLE, and LoRa (868 MHz) connectivity, this board integrates ENS161 and ENS210 sensors over I2C alongside an RFM95W‑868 LoRa radio on SPI. It is powered via a 3.7 V Li‑ion cell with USB‑C charging up to 500 mA, complete with full battery protection, a robust 3.3 V rail tailored for Wi‑Fi burst currents, and per‑peripheral power gating to enhance energy efficiency.

Core Features
• MCU: ESP32‑S3‑MINI‑1‑N8 equipped with an onboard PCB antenna for 2.4 GHz Wi‑Fi/BLE, ensuring optimal wireless performance.
• Sensors: Integrated ENS161 and ENS210 sensors utilize a shared I2C bus with controllable 4.7 kΩ pull‑ups for streamlined communication.
• LoRa Radio: The RFM95W‑868 module, connected via SPI, enables long‑range communication at 868 MHz.

Power & USB‑C Connectivity
• Battery: A reliable 3.7 V 1200 mAh Li‑ion battery connected via a right‑angle JST‑PH 2‑pin connector features built‑in battery protection.
• Charging: The USB‑C receptacle, with CC resistors and TVS protection on D+/D− along with series resistors, supports fast, safe charging with a current limit of 500 mA.
• Regulation: A dedicated 3.3 V regulator capable of handling Wi‑Fi burst currents coupled with bulk and high‑frequency decoupling ensures stable operation, supported by status LEDs indicating power and charge states.

Low‑Power Control
• Peripheral Management: Load switches allow selective power‑gating of the ENS161, ENS210, and RFM95W modules, controlled directly by ESP32‑S3 GPIOs.
• Energy Efficiency: Controllable I2C pull‑ups minimize idle current, vital for prolonged battery life in IoT applications.

RF and Antenna Integration
• 2.4 GHz: Utilizes the integrated PCB antenna on the ESP32‑S3 with proper ground/metal keep‑out zones for optimal signal integrity.
• 868 MHz: Features a controlled‑impedance feed from the RFM95W to a PI matching network (C‑L‑C pads) with flexible antenna options—selectable via SMA connector, chip antenna, or PCB trace—and includes RF ESD protection.

Connectivity & Debug Features
• USB‑C Interface: Provides secure data connectivity with integrated safeguards and proper terminations.
• Debugging: A comprehensive programming/debug header exposes EN, BOOT, and UART lines, with test points on key rails and buses (3V3, VBAT, SCK, MOSI, MISO, SDA, SCL, RESET/EN, GND) to simplify development and troubleshooting.

Design Verification
• Rigorous ERC/DRC and decoupling checks ensure adherence to component ratings and optimal signal routing.
• Maintain RF keep‑outs and impedance‑controlled traces for both 2.4 GHz and 868 MHz paths, securing reliable performance even during high‑intensity operations.

#IoT #ESP32S3 #LoRa #LowPowerDesign #USB-C #WirelessConnectivity #BatteryPowered #RFDesign

Created

4 days ago

1 Contributor(s)

Controls

Properties

Availability & Pricing

Distributor		Qty 1
	Arrow	$0.53–$0.64
	Digi-Key	$3.65–$3.78
	LCSC	$8.09
	Mouser	$6.71
	TME	$1.47
	Verical	$0.53–$0.55

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