Relay and Lighting Setup

Thought for 2 mins 20 sec

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.

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

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.

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

Thought for 1 min 23 sec

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

Files

Pins

Symbol

Layout

3D View

Arduino Nano