Gaugeflow

cclienti·gaugeflow·hardware/gaugeflow/gaugeflow.kicad_pcb

About the Gaugeflow PCB

Gaugeflow is an open source RP2040/RP2350 PCB design by cclienti, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 72 × 61 mm, with 22 components from 17 distinct parts.

Its main chip is the RaspberryPi_Pico, from the RP2040/RP2350 family. Other key parts include the AMS1117-3.3, 24LC32 and LM4040DBZ-3. By type, the board carries 8 connectors, 6 capacitors, 3 ICs, 2 resistors, 1 module and 1 switch.

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

From the project

Measure the flow rate of an air compressor

KiCad schematic and PCB design for the Gaugeflow airflow meter.

This repository uses git submodules (Pico SDK). Clone with:

Custom footprints (SSD1309.kicadmod, gaugeflow-logo.kicadmod) are included in the project directory and referenced locally — no external library needed.

Gaugeflow, from the project README — From the project README

Main components on the Gaugeflow

AMS1117-3.3 24LC32 LM4040DBZ-3 RaspberryPi_Pico

Gaugeflow bill of materials (BOM)

22 components, 17 distinct parts.

Qty	Part	Footprint	Refs
1	AMS1117-3.3	SOT-223-3_TabPin2	U1
1	24LC32	SOIC-8_3.9x4.9mm_P1.27mm	U2
1	LM4040DBZ-3	SOT-23_Handsoldering	U3
1	RaspberryPi_Pico	RaspberryPi_Pico_SMD_HandSolder	A1
1	Conn_01x02_Pin	SolderWire-0.5sqmm_1x02_P4.8mm_D0.9mm_OD2.3mm	J1
3	Conn_01x04_Pin	PinHeader_1x04_P2.54mm_Vertical	J2, J3, J4
1	Conn_01x05_Pin	PinHeader_1x05_P2.54mm_Vertical	J5
1	Conn_01x08_Pin	SSD1309	J6
1	Conn_01x06_Pin	PinHeader_1x06_P2.54mm_Vertical	J7
1	Conn_01x03_Pin	PinHeader_1x03_P2.54mm_Vertical	J8
1	RotaryEncoder_Switch_MP	RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm	SW1
1	MBR1020VL	D_SMA	D1
1	10u	CP_Elec_5x5.3	C1
1	22u	CP_Elec_5x5.3	C2
4	100n	C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C3, C4, C5, C6
1	22k 1%	R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R1
1	33k 1%	R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R2

Gaugeflow design files

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

Layouthardware/gaugeflow/gaugeflow.kicad_pcb
Schematichardware/gaugeflow/gaugeflow.kicad_sch

Gaugeflow: common questions

What microcontroller does the Gaugeflow use?

The Gaugeflow is built around the RaspberryPi_Pico, from the RP2040/RP2350 family.

How big is the Gaugeflow PCB?

The Gaugeflow measures 72 × 61 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Gaugeflow?

22 components, from 17 distinct parts. The full bill of materials is listed on this page.

Where can I download the Gaugeflow design files?

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

Can I use the Gaugeflow design in my own project?

Yes, under the terms of its GPL-3.0 license, which cclienti chose for the repository.

Can I test firmware for the Gaugeflow 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.