Relay and Lighting Setup

Thought for 2 mins 20 sec

flux

I’ll add a 5V SSD1306 I2C header (GND,VCC,SCL,SDA) plus two ULN2003A input headers, with I2C pull-ups.

Place 1x 4-pin Header for SSD1306: GND, 5V, SCL→A5, SDA→A4.
Add two 4.7k Resistors: A4→ 5V, A5→ 5V.
Place 2x 6-pin Header for ULN2003A modules: IN1..IN4, VCC, GND. Map IN1..IN4 to D4–D7 and D8–D11; tie VCC→ 5V, GND→GND.

Clarify:

ULN2003A header pin order OK as IN1,IN2,IN3,IN4,VCC,GND?
Mark the I2C pull-ups as DNP in case the SSD1306 module already has them? Click Start and I’ll execute.

D

dgrosen2

ULN2003A header pin order OK as IN1,IN2,IN3,IN4,VCC,GND
Mark the I2C pull-ups as DNP in case the SSD1306 module already has them. execute.

Thought for 1 min 43 sec

flux

I’ll add a 5V SSD1306 I2C header and two ULN2003A input headers, with DNP 4.7k pull-ups, wired to your Nano.

Place 4-pin Header (GND,VCC,SCL,SDA) → GND, 5V, SCL→A5, SDA→A4.
Add two 4.7k Resistor pull-ups: A4→ 5V, A5→ 5V, mark both DNP.
Place two 6-pin Header (IN1,IN2,IN3,IN4,VCC,GND). Header 1 IN1..IN4 → D4–D7; Header 2 IN1..IN4 → D8, D9, D10, D11/MOSI; both VCC→ 5V, GND→GND.

Click Start on the plan bar to execute.

D

dgrosen2

Use D4–D7 and D8–D11 as you suggested for the ULN2003A inputs,

Thought for 1 min 23 sec

flux

I’ll add a 5V SSD1306 I2C header and two ULN2003A input headers, with DNP 4.7k pull-ups, wired per your pin choices.

SSD1306 4-pin header [GND, VCC, SCL, SDA] → GND, 5V, A5, A4.
Two 4.7k Resistors as DNP pull-ups: A4→ 5V, A5→ 5V.
ULN2003A header 1 (IN1,IN2,IN3,IN4,VCC,GND): IN1..IN4 → D4–D7; VCC→ 5V, GND→GND.
ULN2003A header 2 (IN1,IN2,IN3,IN4,VCC,GND): IN1..IN4 → D8–D11; VCC→ 5V, GND→GND.

Click Start on the plan bar and I’ll execute these changes.

Confirm pin mapping

Ask about I2C pull-ups

Clarify header orientation

Ask about current limits

Add decoupling caps

Sign up to send

Files

Pins

Symbol

Layout

3D View

AREF

RESET

COM/GND

A1

D12/MISO

D13/SCK

D1/TX

A0

RESET__1

D5

D3

D9

A2

VIN

A3

A7

A6

+5V

D10

D4

D0/RX

D8

COM/GND__1

A5

D7

D11/MOSI

3V3

A4

D2

D6

Name

Pin #

Type

Current

Max Current

Part Type

Pin Orientation

Section

D1/TX

1

Bi-Directional

0.02A

Terminal

Left

GPIO

D0/RX

2

Bi-Directional

0.02A

Terminal

Left

GPIO

RESET

3

Input

0.02A

Terminal

Top

Power

COM/GND

4

Power In

0.5A

Terminal

Right

Power

D2

5

Bi-Directional

0.02A

Terminal

Left

GPIO

D3

6

Bi-Directional

0.02A

Terminal

Left

GPIO

D4

7

Bi-Directional

0.02A

Terminal

Left

GPIO

D5

8

Bi-Directional

0.02A

Terminal

Left

GPIO

D6

9

Bi-Directional

0.02A

Terminal

Left

GPIO

D7

10

Bi-Directional

0.02A

Terminal

Right

GPIO

D8

11

Bi-Directional

0.02A

Terminal

Right

GPIO

D9

12

Bi-Directional

0.02A

Terminal

Right

GPIO

D10

13

Bi-Directional

0.02A

Terminal

Right

GPIO

D11/MOSI

14

Bi-Directional

0.02A

Terminal

Right

GPIO

D12/MISO

15

Bi-Directional

0.02A

Terminal

Right

GPIO

D13/SCK

16

Bi-Directional

0.02A

Terminal

Right

GPIO

3V3

17

Power In

0.5A

Terminal

Top

Power

AREF

18

Input

0.02A

Terminal

Top

Power

A0

19

Bi-Directional

0.02A

Terminal

Left

GPIO

A1

20

Bi-Directional

0.02A

Terminal

Left

GPIO

A2

21

Bi-Directional

0.02A

Terminal

Left

GPIO

A3

22

Bi-Directional

0.02A

Terminal

Left

GPIO

A4

23

Bi-Directional

0.02A

Terminal

Left

GPIO

D8