Imported from GitHub: eamars/RaspberryPi-Pico-Motor-Expansion-Board · commit 7dda850 · license GPL-3.0

Description

A raspberry pi pico expansion board designed for OpenTrickler project

README

Raspberry Pi Pico Motor Expansion Board V2

[!Note] You can purchase the board directly from Mellow 3D and ship worldwide now. LINK: https://www.aliexpress.com/item/1005008080766173.html

The Raspberry Pi Pico Motor Expansion Board V2 vis designed to be used as the controller for OpenTrickler. The board is designed to trickle certain amount of charges (e.g, gun powder) from the reservoir by reading measurements from the attached precision digital balance and actuate corresponding motors.

Join our discord server for help and development information.

Peripherals

The PINOUT diagram is shown below. To pair with the OpenTrickler controller software, you need to use Pico W as the main controller.

• EXP1/EXP2: To be paired to RepRap 12864 LED display and the compatible display module.

• PWM1/PWM2/PWM3: Can be used to connect with SG90/MG90/S0009M servo motors, or Neopixel RGB LEDs (WS2812)

• UART0: Can be used to connect with external serial to UART adapter, when UART1 is not used.

• UART1: Compatible with RS232 devices.

Power

The board is designed to be power from USB-C Charger or power banks. The charger MUST support minimum 12V and 2A output.

NOTE: The board is NOT compatible with USB-A or USB-B charger or adapter cable. USB-C cable and charger must be used.

PCB

The board is designed to be manufactured with 4 layer PCB. Traces are placed at top and bottom layers. Two mid layers are for power (Vcc, 5V) and GND.

Manufacturing

The board is designed with hand soldering in mind. The board can also be manufactured by SMT.

BOM and gerber files are provided under production directory. Instructions are also provided regarding the PCB contract manufactoring with JLCPCB.

Components Substitution

There are several components on JLCPCB that can be out of stock from time to time. The table below shows the substitution of those components.

Designator	Part Number	Primary LCSC Part Number	Substitution LCSC Part Number
U2	CAT24C256 (SOIC-8)	C79987	C81195 (CAT24C128)
IC1	TPS5450 (SOP-8)	C114425
U3	CH224K (ESSOP-10)	C970725
L1	15uH Inductor (10x11)	C151872	C439295C5123010
U4	MAX3232 (SOIC-16)	C18261
J10	DB9 Male	C426221	C141880
U5,U6,U7,U8	74LVC1G125	C23654

Revisions

• v2.0: Initial release
• v2.1: Move all vias from pads to minimise SMT failure.

Errata

None