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NametagVoltmeter

oihdesigns·Micro-DMM·PCBDesigns/NametagVoltmeter/NametagVoltmeter.kicad_pcb

NametagVoltmeter PCB layout, top view — open source AVR/Arduino board by oihdesigns

About the NametagVoltmeter PCB

NametagVoltmeter is an open source AVR/Arduino PCB design by oihdesigns, published on GitHub. It is a 4-layer board measuring 88.9 × 50.8 mm, with 66 components from 50 distinct parts.

Its main chip is the Arduino_Nano_ESP32, from the AVR/Arduino family. Other key parts include the AD8237ARMZ, TMUX1108PWR, TCA9536DGKR, OPA333AIDBVR and TLV61046ADBVR. By type, the board carries 19 resistors, 13 capacitors, 9 ICs, 8 connectors, 5 transistors and 4 switches.

It belongs with the test & measurement designs in this gallery.

From the project

A small, open hardware DMM

This is the PCB design and code for a 4.5 digit DMM/ instrumentation module. It is designed and written primairly for Arduino-style development boards.

I've developed this DMM in my work testing and troubleshooting electronics to make my life easier.

I've had Deep-Wiki index my documentation. It did a mostly okay job. You can read its summary here: [](https://deepwiki.com/oihdesigns/Micro-DMM)

NametagVoltmeter, from the project README
From the project README

Main components on the NametagVoltmeter

AD8237ARMZTMUX1108PWRTCA9536DGKROPA333AIDBVRTLV61046ADBVRMAX1683TPS613222ADBVLM4040DBZ-2.5LM4040DBZ-5Arduino_Nano_ESP32

NametagVoltmeter bill of materials (BOM)

66 components, 50 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AD8237ARMZ
LM317_TO-220
U1
1
TMUX1108PWR
IX4426N
U2
1
TCA9536DGKR
ADS1115IDGS
U3
1
OPA333AIDBVR
IX4426N
U4
1
TLV61046ADBVR
U5
1
MAX1683
U7
1
TPS613222ADBV
U9
1
LM4040DBZ-2.5
U10
1
LM4040DBZ-5
U11
1
Arduino_Nano_ESP32
A1
1
MMBT3904
Q1
1
AO3400A
Q2
2
BSS138
Q6, Q7
1
AO3400A MOSFET
Q8
1
MicoSD
J2
1
Conn_01x02_Pin
J7
1
Out to Screen
J9
1
I_Input
J11
2
Barrel_Jack
J14, J15
2
Conn_01x01_Socket
J16, J17
Show 30 more
QtyPartRefs
1
Fuse
F1
1
Jumper_2_Bridged
JP6
3
SW_Push
SW1, SW2, SW4
1
SW_SPDT
SW3
1
LED
D1
2
D_Schottky
D4, D5
1
2.2uH
L1
1
22uH
L2
4
1uF
C1, C5, C6, C18
4
4.7uF
C2, C9, C10, C15
1
2.2uF
C3
2
0.1uF
C4, C17
2
22uF
C16, C19
1
500
R1
1
1K
R2
1
22K
R3
1
100K
R4
1
62.0
R5
1
330.0
R6
1
100K
0
R7
1
100R
732k
R8
1
22.0K
R9
1
71.5k
R10
1
200R
22.0K
R14
2
4.7K
499.0K
R17, R18
2
0
R21, R23
1
1.0M
R24
1
4.7K
R27
1
1K x4
RN1
1
10k x4
RN2

NametagVoltmeter design files

The KiCad project lives in the oihdesigns/Micro-DMM repository on GitHub; these links point at the commit this page was built from.

NametagVoltmeter: common questions

What microcontroller does the NametagVoltmeter use?

The NametagVoltmeter is built around the Arduino_Nano_ESP32, from the AVR/Arduino family.

How big is the NametagVoltmeter PCB?

The NametagVoltmeter measures 88.9 × 50.8 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the NametagVoltmeter?

66 components, from 50 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 NametagVoltmeter design files?

From the oihdesigns/Micro-DMM 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 NametagVoltmeter design in my own project?

The repository has no license, so all rights stay with oihdesigns. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the NametagVoltmeter 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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