Schematic

Full Schematic

Teensy Pinout

The Teensy 4.0 is the central microcontroller with the following pin assignments:

Pin	Function
0	DIGITAL1
1	DIGITAL2
2	BUFFER_OE_A1_2
3	BUFFER_LATCH
4	FLEXIO_SCK
5	FLEXIO_MOSI_A8_5
6	BUFFER_R1_A5_6
7	BUFFER_CLK_A3_7
8	A4_8
9	BUFFER_G1
10	BUFFER_B1
11	BUFFER_G2/MOSI
12	BUFFER_R2
13	BUFFER_B2/SCK
14	A2_14
15	TPWM1
16	ESPTX1
17	ESPRX1
18	TSDA0
19	TSCL0
20	A6_20
21	A7_21
22	ANALOG1
23	ANALOG2

Logic Handling HUB75/APA102/WS2812

The HUB75 level shifter uses SN74HCT245DWR chips to convert 3.3V logic to 5V for the LED panels. The WS2812 level shifter provides signal conditioning for individually addressable LED strips with 150Ω impedance matching resistors.

Power Handling and Voltage Regulation

The power regulation circuit uses an AP2112K-3.3 regulator to step down from 5V to 3.3V for the Teensy and logic circuits. Decoupling capacitors (22µF and 0.1µF) ensure stable power delivery.

Visual indicators include:

• LED1: 3.3V power indicator (10K resistor)
• LED2: 5V power indicator (10K resistor)

Sensors and Inputs

The board provides several input connectors:

Microphone (P2):

• Pin 1: GND
• Pin 2: 3.3V
• Pin 3: ANALOG1

Misc Input (P4):

• Pin 1: GND
• Pin 2: 3.3V
• Pin 3: DIGITAL1

Button Inputs (P3, P5):

• Pin 1: GND
• Pin 2: 3.3V
• Pin 3: ANALOG2 / DIGITAL2

I2C and UART Communication

I2C Breakouts (I1-I5): All five I2C ports share the same pinout:

• Pin 1: GND
• Pin 2: 3.3V
• Pin 3: TSCL0 (Clock)
• Pin 4: TSDA0 (Data)

I2C pull-up resistors (10K) are integrated on the board.

External Serial Connection (I6):

• Pin 1: GND
• Pin 2: 3.3V
• Pin 3: ESPRX1 (470Ω inline resistor)
• Pin 4: ESPTX1 (470Ω inline resistor)

PWM Fan Control

Two PWM fan control headers (J3, J4) use KF2510-AW connectors:

• Pin 1: GND
• Pin 2: GND
• Pin 3: +5V
• Pin 4: SPWM1

Mounting Points

Four M2 mounting pads (PAD3-PAD6) are provided for secure mounting of the controller board.