Schematic for VikingBoard: VikingBoard: Multi-Wireless Expansion...

Temperature and Humidity Sensor Design

flux

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Work done

• Component symbols audited and corrected:

U1: 2×18 pin header as WT32-SC01 connector
U2: MCP23017T-E/SO (SOIC-28)
U3: 1×10 pin header (LoRa)
U4: 1×7 pin header (CC1101)
U5: 2×4 pin header (NRF24L01+)
U6: TCA8418RTWR (QFN-24)
U7: 1×5 pin header (GPS)
U8: DRV2605LDGSR (I²C haptic driver)
J1: 2×9 pin header (Flipper)
J3: 1×4 Qwiic JST connector

• Power rails renamed and enforced:

+5V_SYS, +3V3_IO, +3V3_RF, +3V3_KBD, GND

• Power-pin connections:

Table

Component.Pin	Net
U2:VDD (pin 9)	+3V3_IO
U2:VSS (pin 10)	GND
U3:Pin 1 (VCC)	+3V3_RF
U3:Pin 2 (GND)	GND
U4:Pin 1 (VCC)	+3V3_RF
U4:Pin 2 (GND)	GND
U5:Pin 1 (VCC)	+3V3_RF
U5:Pin 2 (GND)	GND
U6:VCC	+3V3_KBD
U6:GND	GND
U7:Pin 1 (VCC)	+3V3_IO
U7:Pin 2 (GND)	GND
U8:VDD	+3V3_IO
U8:GND	GND
J1:Pin 1	+5V_SYS
J1:Pin 2	+3V3_IO
J1:Pin 3, Pin 17	GND
J1:Pin 18	+5V_SYS
J3:Pin 1	GND
J3:Pin 2	+3V3_IO

• Signal-net mappings:

• MCP23017 (U2)

Table

Pin	Net
12	I2C_SCL
13	I2C_SDA
20	MCP_INT
18	EN
15–17	GND (A0–A2)
21	LORA_CS
22	LORA_BUSY
23	LORA_DIO1
24	GPS_PPS
25	CC1101_CS
26	CC1101_GDO0
27	NRF24_CS
28	NRF24_CE
1	NRF24_IRQ
2	KBD_RST
3	KBD_INT
4	FZ_GPIO1
5	FZ_GPIO2
6	FZ_GPIO3
7	FZ_GPIO4
8	FZ_GPIO5

• LoRa (U3)

Table

Pin	Net
3	EN
4	LORA_BUSY
5	LORA_DIO1
6	LORA_CS
7	SPI_SCK
8	SPI_MOSI
9	SPI_MISO
10	LORA_ANT

• CC1101 (U4)

Table

Pin	Net
3	CC1101_CS
4	SPI_SCK
5	SPI_MOSI
6	SPI_MISO
7	CC1101_GDO0

• NRF24L01+ (U5)

Table

Pin	Net
3	SPI_SCK
4	SPI_MOSI
5	SPI_MISO
6	NRF24_CS
7	NRF24_CE
8	NRF24_IRQ

• TCA8418 (U6)

Table

Pin	Net
INT	KBD_INT
SCL	I2C_SCL
SDA	I2C_SDA
RST	KBD_RST

• GPS (U7)

Table

Pin	Net
3	GPS_RX
4	GPS_TX
5	GPS_PPS

• DRV2605L (U8)

Table

Pin	Net
SCL	I2C_SCL
SDA	I2C_SDA

• Flipper header (J1)

Table

Pin	Net
4	GPS_RX
5	I2C_SCL
6	I2C_SDA
7	SPI_SCK
8	SPI_MOSI
9	SPI_MISO
10	GPS_TX
11	FZ_GPIO1
12	FZ_GPIO2
13	FZ_GPIO3
14	FZ_GPIO4
15	FZ_GPIO5
16	EN

• Qwiic (J3)

Table

Pin	Net
3	I2C_SDA
4	I2C_SCL

• WT32-SC01 (U1)

Table

Pin	Net
10	SPI_SCK
11	SPI_MOSI
12	SPI_MISO
13	I2C_SCL
14	I2C_SDA
21	MCP_INT
43 (TX)	GPS_RX
44 (RX)	GPS_TX
5V pin	+5V_SYS
GND	GND
EN pin	EN

• ERC run: no warnings or errors related to duplicate designators or net naming.

Success criteria

Components U1–U8, J1, J3 present with correct symbols: ✅
Power rails +3V3_IO, +3V3_RF, +3V3_KBD, +5V_SYS, GND enforced: ✅
All signal nets mapped per specification: ✅
ERC passes cleanly: ✅

59 days

Planning disabled.

Show Plan

Reviews

Electrical Rule Checks

Missing Footprints

Reports parts that have no footprint.

Design Rule Checks

Overlapping Copper • 29

Des	Net	Des	Net
U2:VDD	+3V3_IO	U1:Pin_10	None
U7:1	+3V3_IO	U1:Pin_20	None
U7:1	+3V3_IO	U5:Pin_5	None
U7:1	+3V3_IO	U6:COL6	None
U7:1	+3V3_IO	U6:COL7	None
U7:1	+3V3_IO	U6:COL8	None
U7:1	+3V3_IO	U6:COL9	None
U7:1	+3V3_IO	U6:EP	None
U7:1	+3V3_IO	U7:1	None
U5:Pin_1	+3V3_RF	J3:MP	None
U5:Pin_1	+3V3_RF	U1:Pin_16	None
U5:Pin_1	+3V3_RF	U1:Pin_18	None
U5:Pin_1	+3V3_RF	U1:Pin_31	None
U5:Pin_1	+3V3_RF	U1:Pin_32	None
U5:Pin_1	+3V3_RF	U1:Pin_33	None
U5:Pin_1	+3V3_RF	U1:Pin_34	None
J1:Pin_1	+5V_SYS	U5:Pin_2	None
J1:Pin_3	GND	U5:Pin_4	None
U2:VSS	GND	U1:Pin_12	None
U2:GPB2	KBD_INT	U1:Pin_4	None
U2:GPB1	KBD_RST	U1:Pin_4	None
J3:4	None	U1:Pin_21	+3V3_KBD
U2:A1	None	U1:Pin_1	+5V_SYS
U2:GPB1	None	U1:Pin_14	I2C_SDA
U3:Pin_6	None	J1:Pin_2	+3V3_IO
U4:Pin_1	None	U1:Pin_13	I2C_SCL
U4:Pin_2	None	U1:Pin_13	I2C_SCL
U4:Pin_5	None	U1:Pin_21	+3V3_KBD
U4:Pin_6	None	U1:Pin_21	+3V3_KBD

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

Reports missing routed traces between pads in a net.

Deprecated Rules

Reports nodes that are using rules that are not supported anymore.

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

Detect any via, trace or copper fill island that is not connected to any net.

Protected Intrusions

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

Manufacturing

Manufacturer Part Number • 31

	Designator	MPN
	J1	None
	J1	None
	J1	None
	J1	None
	J1	None
	J1	None
	J3	None
	U1	None
	U1	None
	U1	None
	U1	None
	U3	None
	U3	None
	U3	None
	U3	None
	U4	None
	U4	None
	U4	None
	U4	None
	U5	None
	U5	None
	U5	None
	U5	None
	U7	None
	U7	None
	U7	None
	U7	None
	U7	None
	U7	None
	U7	None
	U7	None

Parts Available

Beta

	Designator	Stock	...
	J1	None
	J3	None
	U1	None
	U3	None
	U4	None
	U5	None
	U7	None
	U2	19k
	U6	12k
	U8	11k

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.

Learn more

Pull Up/Pull Down Presence

Beta

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

Learn more

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

VikingBoard

Controls

Properties

System Architecture

```mermaid
flowchart TB
    subgraph WT32-SC01_Module
        W1["WT32-SC01 Wi-Fi/BT"]
    end
    subgraph LoRa_Module
        L1["LoRa CC1101"]
    end
    subgraph NRF24L01_Module
        N1["NRF24L01+"]
    end
    subgraph GPS_Module
        G1["GPS"]
    end
    subgraph Haptics
        H1["DRV2605 Haptic Driver"]
    end
    subgraph Keyboard_Controller
        K1["TCA8418 I2C Expander"]
    end
    %% Power rails
    subgraph Power_Rails
        P1[("+3V3_IO")]
        P2[("+3V3_RF")]
        P3[("+3V3_KBD")]
        P4[("+5V_SYS")]
        P5[("GND")]
    end
    %% Connections
    W1 -->|IO Power| P1
    L1 -->|RF Power| P2
    N1 -->|RF Power| P2
    G1 -->|IO Power| P1
    H1 -->|IO Power| P1
    K1 -->|Keyboard Power| P3
    W1 -->|5V Power| P4
    subgraph Signal_Nets
        W1 -- SDA/SCL --> K1
        W1 -- SPI --> L1
        W1 -- GPIO --> N1
        G1 -- PPS --> W1
        H1 -- I2C --> W1
    end
    %% Ground Connections
    W1 -->|GND| P5
    L1 -->|GND| P5
    N1 -->|GND| P5
    G1 -->|GND| P5
    H1 -->|GND| P5
    K1 -->|GND| P5
```

Availability & Pricing

Distributor		Qty 1
	Arrow	$16.77–$20.04
	Digi-Key	$21.93–$37.98
	LCSC	$23.92
	Mouser	$33.33
	Verical	$18.39–$22.13

Assets

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