PiPicoMite01

Features

• Raspberry Pi Pico
  • All pins brought to header
  • Pin marking on rear
• VGA (1:2:1 - R:G:B)
• PS/2 Keyboard
  • 5V to keyboard with voltage translator
• SD Card
  • Full size card
  • Up to 32GB
• Stereo audio
  • 3.5mm jack
• 16-bit GPIO
  • MCP23017 port expander
  • I2C1
  • 2x20 0.1" pitch header
  • Jumper selectable terminators
• Power options
  • 5V power input via USB B or 0.1" pitch header
  • 3.3V output header
• 120mmx70mm outline
• (4) 6-32 Mounting holes

Pin Marking on Rear

Schematic

• PiPicoMite01 Rev 1 Schematic

Connectors

GP	FUNCTION	PICO PIN
GP6	AUDIO-L	9
GP7	AUDIO-R	10
GND	AUDIO-GND	8
3.3V	PS2_3.3V
VSYS	PS2_5V	39
GP8	PS2_CLK	11
GP9	PS2_DATA	12
GND	PS2_GND	13
3.3V	SD_3.3V
GP12	SD_MISO	16
GP11	SD_MOSI	15
GP10	SD_SCK	14
GP13	SD_SLVSEL	17
GND	SD_GND	18
GP18	VGA_BLU	24
GND	VGA_GND	23
GP20	VGA_GRN_HI	26
GP19	VGA_GRN_LO	25
GP16	VGA_HSYNC	21
GP21	VGA_RED	27
GP17	VGA_VSYNC	22

H1 - 3.3V Power Out

J1 - SD Card

J2 - USB B Power Connectors

• Full size USB B connector
• No USB signal connections, just used for power

J3/J5 Pico Connectors

J4 - I2C Terminators

• Install shunts to terminate SDA, SCL signals

J7 - Audio

J8 - PS/2 Keyboard

J9 - 5V Distribution

J10 - I2C INT

• Install jumper to connect Interrupt from MCP23017 to GP0 pin on Pico
• No Pull-up

P1 - VGA

Prototype

• Runs PicoMite (MaxiMite) BASIC (VGA, PS/2)
• Uses cards
  • Raspberry Pico on Breadboard
  • 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 (R12=270)	12	BLU
VGA_GND	GND	23	VGA	GND	19	GRN
VGA_GRN_HI	GP20	26	VGA	G5 (R6=390)	6	GRN
VGA_GRN_LO	GP19	25	VGA	G4 (R7=820)	7	GRN
VGA_HSYNC	GP16	21	VGA	HS	17	GRY
VGA_RED	GP21	27	VGA	R4 (R1=270)	1	ORG
VGA_VSYNC	GP17	22	VGA	VS	18	WHT

Raspberry Pi Pico in a Small Plastic Project Box

• Raspberry Pico on Breadboard

VGAX49

• VGAX49
• Resistors Values
  • Selected for 0.7V output on analog RGB pins
  • R12 = 270
  • R6 = 390
  • R7 = 820
  • R1 = 270

	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
• PWR1 is the power to the PS/2 #1, #2 connectors
• +3.3V connections are needed when the TXS0104 translator is installed
• Routing
  • CLK1, DAT1 on J3 go to J1 (Purple)
  • CLK2, DAT2 on J3 go to J2 (Not used)

SD CARD X49

• SD CARD X49

GRID49

• GRID49
• Audio filter circuit

• C1 = Audio_In-L
• D1 - GND
• E1 - Audio_In-R

Mechanicals

Assembly Sheet

PicoMite01 Rev1 Assembly Sheet