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CO2-PCB-Monitor

morzack·CO2-PCB-Monitor·v1/co2_7seg.kicad_pcb

CO2-PCB-Monitor layout, top view — open source AVR/Arduino board by morzack

About the CO2-PCB-Monitor

CO2-PCB-Monitor is an open source AVR/Arduino PCB design by morzack, published on GitHub under the MIT license. It is a 4-layer board measuring 82.5 × 35 mm, with 45 components from 25 distinct parts.

Its main chip is the ATMEGA328P-A, from the AVR/Arduino family. Other key parts include the MAX7221XNG, MIC5205-5.0YM5 and MIC5366-3.3YC5. By type, the board carries 15 capacitors, 12 resistors, 5 ICs, 4 LEDs, 3 transistors and 3 connectors.

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

From the project

Design and manufacturing files for a desktop atmospheric CO2 monitor

This repo contains the hardware and software required to manufacture and assemble a small seven segment CO2 monitor.

The monitor is built around a 4 digit seven segment display (with automatic dimming based on ambient light) that displays the current atmospheric CO2 concentration as measured by an Adafruit SCD-40 module over i2c.

In practice, this project can serve as a generic platform for any i2c module that might benefit from a 4 digit display. Potentially, other projects could be built around this architecture.

CO2-PCB-Monitor, from the project README
From the project README

Main components on the CO2-PCB-Monitor

ATMEGA328P-AMAX7221XNGMIC5205-5.0YM5MIC5366-3.3YC5

CO2-PCB-Monitor bill of materials (BOM)

45 components, 25 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA328P-A
ATmega328P-A
U1
1
~
U2
1
MAX7221XNG
MAX7221xNG
U3
1
MIC5205-5.0YM5
U4
1
MIC5366-3.3YC5
U5
2
2N3906
Q1, Q2
1
2N3904
Q3
1
16MHZ
16MHz
Y1
1
CONN_01X02
Conn_01x02
J1
1
CONN_02X03_ODD_EVEN
Conn_02x03_Odd_Even
J2
1
CONN_01X02
Conn_01x02
J3
1
3V3_OR
3v3_or
JP1
1
SW_Push
SW1
4
LDS-C814RI
LED1, LED2, LED3, LED4
2
18P
18p
C1, C2
2
0.1U
0.1u
C3, C10
5
100N
100n
C4, C5, C6, C7, C8
1
10U
10u
C9
5
1u
C11, C12, C13, C14, C15
2
10K
10k
R1, R6
Show 5 more
QtyPartRefs
2
5.1K
5.1k
R2, R3
5
100K
100k
R4, R8, R10, R11, R12
1
1k
R5
1
R_Photo
R7
1
22K
22k
R9

CO2-PCB-Monitor design files

The KiCad project lives in the morzack/CO2-PCB-Monitor repository on GitHub; these links point at the commit this page was built from.

CO2-PCB-Monitor: common questions

What microcontroller does the CO2-PCB-Monitor use?

The CO2-PCB-Monitor is built around the ATMEGA328P-A, from the AVR/Arduino family.

How big is the CO2-PCB-Monitor?

The CO2-PCB-Monitor measures 82.5 × 35 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the CO2-PCB-Monitor?

45 components, from 25 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 CO2-PCB-Monitor design files?

From the morzack/CO2-PCB-Monitor 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 CO2-PCB-Monitor design in my own project?

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

Can I test firmware for the CO2-PCB-Monitor without the hardware?

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

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