EyeVolt

rbarzic·EyeVolt·hw/pcb/eyevolt.kicad_pcb

About the EyeVolt PCB

EyeVolt is an open source RP2040/RP2350 PCB design by rbarzic, published on GitHub under the Apache-2.0 license. It is a 4-layer board measuring 123.7 × 94 mm, with 113 components from 15 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the MCP6L04x-xSL, OPA316QDBVTQ1, 74HCT4051 and 74HCT4051 DAC_FB_MUX. By type, the board carries 48 resistors, 47 capacitors, 16 ICs and 2 connectors.

It belongs with the displays & leds designs in this gallery.

From the project

Monitor up to 8 voltages simultaneously

EyeVolt 2.0 is a 12-channel DC voltage monitor and an 8-channel programmable DC voltage generator, both built around a single Raspberry Pi Pico (the RP2040 U9).

On the monitor side the Pico continuously samples up to twelve external voltages and streams the raw ADC readings out over USB-serial, exactly like v1.1. On the generation side the Pico produces eight independent 0 - 3.3 V outputs by low-pass-filtering eight PWM channels and buffering them; a feedback multiplexer lets the Pico read its own generated outputs back.

EyeVolt, from the project README — From the project README

Main components on the EyeVolt

MCP6L04x-xSLOPA316QDBVTQ1Pico 74HCT405174HCT4051 DAC_FB_MUX

EyeVolt bill of materials (BOM)

113 components, 15 distinct parts.

Qty	Part	Footprint	Refs
4	MCP6L04x-xSL	SOIC-14_3.9x8.7mm_P1.27mm	U1, U2, U3, U8
8	OPA316QDBVTQ1	SOT-23-5	U4, U5, U6, U7, U13, U14, U15, U16
1	Pico	RPi_Pico_SMD_TH	U9
2	74HCT4051	SOIC-16_3.9x9.9mm_P1.27mm	U10, U11
1	74HCT4051 DAC_FB_MUX	SOIC-16_3.9x9.9mm_P1.27mm	U12
1	Conn_02x10_Odd_Even	PinHeader_2x10_P2.54mm_Horizontal	J1
1	DAC_PWM_DAC_OUT_2x20	IDC-Header_2x20_P2.54mm_Horizontal	J2
6	C	C_0402_1005Metric_Pad0.74x0.62mm_HandSolder	C1, C2, C19, C24, C25, C26
16	1uF	C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C3, C5, C7, C9, C11, C13, C15, C17 +8
16	DNP 1uF TH ALT	C_Disc_D5.0mm_W2.5mm_P5.00mm	C4, C6, C8, C10, C12, C14, C16, C18 +8
9	100nF	C_0402_1005Metric_Pad0.74x0.62mm_HandSolder	C20, C21, C22, C23, C43, C44, C45, C46 +1
16	10k	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1, R3, R5, R7, R17, R19, R21, R23 +8
16	DNP 10k TH ALT	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R2, R4, R6, R8, R18, R20, R22, R24 +8
8	100K	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R9, R10, R11, R12, R13, R14, R15, R16
8	0R OUT_LINK	R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R25, R26, R27, R28, R45, R46, R47, R48

EyeVolt design files

The KiCad project lives in the rbarzic/EyeVolt repository on GitHub; these links point at the commit this page was built from.

Layouthw/pcb/eyevolt.kicad_pcb
Schematichw/pcb/eyevolt.kicad_sch

EyeVolt: common questions

What microcontroller does the EyeVolt use?

The EyeVolt is built around the Pico, from the RP2040/RP2350 family.

How big is the EyeVolt PCB?

The EyeVolt measures 123.7 × 94 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the EyeVolt?

113 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the EyeVolt design files?

From the rbarzic/EyeVolt repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the EyeVolt design in my own project?

Yes, under the terms of its Apache-2.0 license, which rbarzic chose for the repository.

Can I test firmware for the EyeVolt without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.