Raspberry Pi Pico

Raspberry Pi Pico Features

Raspberry Pi Pico is a low-cost, high-performance microcontroller board with flexible digital interfaces. Key features include:

• RP2040 microcontroller chip designed by Raspberry Pi in the United Kingdom
• Dual-core Arm Cortex M0+ processor, flexible clock running up to 133 MHz
• 264KB of SRAM, and 2MB of on-board Flash memory
• Castellated module allows soldering direct to carrier boards
• USB 1.1 with device and host support
• Low-power sleep and dormant modes
• Drag-and-drop programming using mass storage over USB
• 26 × multi-function GPIO pins
• 2 × SPI, 2 × I2C, 2 × UART, 3 × 12-bit ADC, 16 × controllable PWM channels
• Accurate clock and timer on-chip
• Temperature sensor
• Accelerated floating-point libraries on-chip
• 8 × Programmable I/O (PIO) state machines for custom peripheral support

Repositories

• My Raspberry Pi Pico GitHub repository - Home
  • My MicroPython GitHub repository
  • My CircuitPython GitHub repository

Pinout

Reference Documents

• Raspberry Pi Pico data sheet
• RP2040 Datasheet
• Hardware Design Guide
• Getting started with Raspberry Pi Pico - C/C++ development with Raspberry Pi Pico and other RP2040-based microcontroller boards
• Raspberry Pi Pico C/C++ SDK
• Raspberry Pi Pico Python SDK

Adapter Cards

In Small Plastic Project Box

• CircuitSetup Breadboard

• Fits in 100x60x25mm Project Box
• Socketed Pico
• All Pico pins brought to Male Header pins
• Power/Ground distribution
• 5V jack
  • VSYS connection with schottky diode
• Can by Mounted on ODAS Adapter card

Cut Etch / Add wires

• Cut etch from + near jack to board side + connections
• Verify cut with jumper (center pin power jack to + on both sides)

• Add TIE - jumper to ties grounds on both sides together

• Add Power jumper between the two sides

• Add Ground connection Pico pin 38 to - hole near strip
• Add 3.3V Power connection Pico pin 36 to + hole near strip on other side

Pin Table

Pico Pin	BB Pin	Signal		Pico Pin	BB Pin	Signal
1	30	GP0		40	30	VUSB
2	29	GP1		39	29	VSYS
3	28	GND		38	28	GND
4	27	GP2		37	27	3V3EN
5	26	GP3		36	26	3V3OUT
6	25	GP4		35	25	ADCVREF
7	24	GP5		34	24	GP28
8	23	GND		33	23	GND
9	22	GP6		32	22	GP27
10	21	GP7		31	21	GP26
11	20	GP8		30	20	RUN
12	19	GP9		29	19	GP22
13	18	GND		28	18	GND
14	17	GP10		27	17	GP21
15	16	GP11		26	16	GP20
16	15	GP12		25	15	GP19
17	14	GP13		24	14	GP18
18	13	GND		23	13	GND
19	12	GP14		22	12	GP17
20	11	GP15		21	11	GP16

PiPico-01 Card

• PiPico-01 Card - Our design

Interesting Applications

Running RP2040 Doom

• RP2040 Doom

Running MicroPython

• MicroPython page
• Raspberry Pi Pico with MicroPython
• Python SDK
• Quick MicroPython reference for the RP2
• RP2 Python Library Modules
• Card has 264KB of SRAM
• Free memory under MicroPython plus various module sizes

>>> import gc
>>> gc.mem_free()
182624
>>> import time
>>> gc.mem_free()
178544
>>> import machine
>>> gc.mem_free()
174304
>>> 

• To compare QT Py has 19KB free

I2C Scanner

import machine

# Create I2C object
i2c = machine.I2C(0, scl=machine.Pin(17), sda=machine.Pin(16))

# Print out any addresses found
devices = i2c.scan()

if devices:
    for d in devices:
        print(hex(d))

Python File System

• Internal Flash File System
  • Little FS
  • 1.44MB space
  • Blocks are 4KB
  • 352 Blocks on Internal File System
• os functions

import os
os.[TAB]
os.dir()
os.mkdir("newdir")
os.getcwd()
os.mkdir("newdir")
os.chdir('..')
os.listdir()
os.statvfs('/')
os.uname()
os.remove('file2remove')
os.rename('old','new')

• Using files

f = open('filename','w')
f.write('data to add')
f.read()
f.close()

Running PicoMite (MaxiMite) BASIC

• Two versions
  • USB-Serial with SD Card
  • VGA, PS/2 version

Running PicoMite (MaxiMite) BASIC (USB-Serial)

• "Boot to MM BASIC" on the Raspberry Pi Pico with VGA
• BASIC Interpreter for the Raspberry Pi Pico - USB
• SD Card Connections

PicoMite SD Card Wiring

• Install NO5V jumper

SD_Socket	PIN	SD-J1	Pi-Pico	Pico-Pin	Colour
3	GND	1	GND	GND	BLK
7	MISO	2	GPIO16	21	BRN
5	SCLK	3	GPIO18	24	ORA
2	MOSI	4	GPIO19	25	YEL
1	SLV SEL	5	GPIO22	29	WHT
4	VCC	7	3.3V	N/C
6	GND	N/C	GND

Running PicoMite (MaxiMite) BASIC (VGA, PS/2)

• Uses cards
  • VGAX49
  • PS2X49
  • SD CARD X49
  • GRID49
• Pinouts

Cabling

FUNCTION	GP	PICO PIN	CARD	SIG	PIN	COLOUR
AUDIO-L	GP6	9	GRID49	AUD-L	C1	VIO
AUDIO-R	GP7	10	GRID49	AUD-GND	D1	BLK
AUDIO-GND	GND	8	GRID49	AUD-R	E1	YEL
PS2_3.3V	3.3V			3.3V	4	RED
PS2_5V	VSYS	39		PWR1	2	ORG
PS2_CLK	GP8	11		CLK1	6	VIO
PS2_DATA	GP9	12		DAT1	8	YEL
PS2_GND	GND	13		GND	10	BLK
SD_3.3V	3.3V			3.3V	7	RED
SD_MISO	GP12	16		MISO	2	YEL
SD_MOSI	GP11	15		MOSI	4	BLU
SD_SCK	GP10	14		SCLK		VIO
SD_SLVSEL	GP13	17		-SDCS		GRY
SD_GND	GND	18		GND		BLK
VGA_BLU	GP18	24	VGA	B4	12	BLU
VGA_GND	GND	23	VGA	GND	19	GRN
VGA_GRN_HI	GP20	26	VGA	G5	6	GRN
VGA_GRN_LO	GP19	25	VGA	G4	7	GRN
VGA_HSYNC	GP16	21	VGA	HS	17	GRY
VGA_RED	GP21	27	VGA	R4	1	ORG
VGA_VSYNC	GP17	22	VGA	VS	18	WHT

VGAX49

• VGAX49
• Resistors Values
  • Selected for 0.7V output on analog RGB pins

	R,B		G RES		G
Rs	75		R1	390	75
Rm	270		R2	820	264.298
Vin	3.3		RM	264.298	3.3
Vout	0.717				0.729
I (mA)	9.57		I (mA)		9.73

PS2X49

• PS2X49

SD CARD X49

• SD CARD X49

GRID49

• GRID49

Running VGA

Hardware Design Guide Section 3.2