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Dif pressure meter

ardiloot·dif-pressure-meter·electrical/dif-pressure-meter.kicad_pcb

Dif pressure meter PCB layout, top view — open source ESP32 board by ardiloot
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About the Dif pressure meter PCB

Dif pressure meter is an open source ESP32 PCB design by ardiloot, published on GitHub under the MIT license. It is a 2-layer board measuring 41 × 87 mm, with 66 components from 36 distinct parts.

Its main chip is the ESP32-WROOM-E, from the ESP32 family. Other key parts include the CH340C, TP4056, RT9080-33GJ5 and LCD_ST7735S_1.8. By type, the board carries 32 resistors, 11 capacitors, 6 transistors, 5 ICs, 5 connectors and 5 diodes.

It belongs with the power & battery, sensors and iot & wireless designs in this gallery.

From the project

ESP32 based differential pressure (and air flow) meter. Handheld, battery powered DIY device for measuring small pressure differences (Sensirion SDP810-500Pa).

A DIY handheld battery-powered differential pressure meter for measuring and adjusting airflow in air valves, diffusers, or grilles. Accurate measurement of small pressure drops (typically ±50 Pa) is often required, but professional equipment (e.g., Fluke 922) is expensive. This project is a low-cost alternative built with:

- Sensirion SDP810-500Pa differential pressure sensor (±500 Pa range, 0.1 Pa zero-point accuracy) - ESP32-WROOM-32E microcontroller - 1.8" LCD display (ST7735S) - Li-ion battery with TP4056 USB charging - 5-way navigation switch with buzzer feedback - 6 pre-configured air…

Dif pressure meter, from the project README
From the project README

Main components on the Dif pressure meter

CH340CTP4056RT9080-33GJ5ESP32-WROOM-ELCD_ST7735S_1.8

Dif pressure meter bill of materials (BOM)

66 components, 36 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
CH340C
U1
1
TP4056
U2
1
RT9080-33GJ5
U3
1
ESP32-WROOM-E
U4
1
LCD_ST7735S_1.8
U5
3
SIL2308-TP
Q1, Q4, Q5
3
BC817
Q2, Q3, Q6
1
USB_C_RECEPTACLE_USB2.0
USB_C_Receptacle_USB2.0
J1
1
JST PH2
J2
1
CONN_01X06
Conn_01x06
J3
1
CONN_01X07
Conn_01x07
J4
1
CONN_01X04
Conn_01x04
J5
1
PKLCS1212E40A1-R1
LS1
1
SWITCH_5WAY_8X8
SWITCH_5WAY_8x8
SW1
1
LED
D1
1
1N5819HW-7-F
D2
1
1N4148W-7-F
1N4148W
D3
1
BZT52C6V2_RHG
D4
1
BZT52C3V3
D5
5
10UF
10uF
C1, C3, C5, C8, C9
Show 16 more
QtyPartRefs
5
0.1UF
0.1uF
C2, C4, C6, C10, C11
1
22UF
22uF
C7
1
0.1
R1
3
2.4K
2.4k
R2, R6, R7
7
10K
10k
R3, R8, R9, R15, R19, R20, R21
2
1M
R4, R5
1
2k
R10
2
5.1K
5.1k
R11, R12
2
33
R13, R14
1
100K
100k
R16
1
200K
200k
R17
1
300K
300k
R18
5
510
R22, R27, R28, R29, R30
2
2.2K
2.2k
R23, R24
2
100
R25, R26
2
1k
R31, R32

Dif pressure meter design files

The KiCad project lives in the ardiloot/dif-pressure-meter repository on GitHub; these links point at the commit this page was built from.

Dif pressure meter: common questions

What microcontroller does the Dif pressure meter use?

The Dif pressure meter is built around the ESP32-WROOM-E, from the ESP32 family.

How big is the Dif pressure meter PCB?

The Dif pressure meter measures 41 × 87 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Dif pressure meter?

66 components, from 36 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Dif pressure meter design files?

From the ardiloot/dif-pressure-meter repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Dif pressure meter design in my own project?

Yes, under the terms of its MIT license, which ardiloot chose for the repository.

Can I test firmware for the Dif pressure meter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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