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DMM Feather Redux

oihdesigns·Micro-DMM·PCBDesigns/DMM Feather Redux/DMM Feather Redux.kicad_pcb

DMM Feather Redux PCB layout, top view — open source AVR/Arduino board by oihdesigns
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About the DMM Feather Redux PCB

DMM Feather Redux is an open source AVR/Arduino PCB design by oihdesigns, published on GitHub. It is a 4-layer board measuring 85.5 × 47.4 mm, with 60 components from 40 distinct parts.

Its main chip is the Arduino_UNO_R3, from the AVR/Arduino family. Other key parts include the TCA9536DGKR, OPA333AIDBVR, LM317_TO-220, LM4040DBZ-5 and IX4426N. By type, the board carries 19 resistors, 14 capacitors, 9 ICs, 8 connectors, 3 transistors and 3 switches.

It belongs with the dev boards & breakouts and 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)

DMM Feather Redux, from the project README
From the project README

Main components on the DMM Feather Redux

TCA9536DGKROPA333AIDBVRLM317_TO-220LM4040DBZ-5IX4426NMAX1683LM4040DBZ-2.5ISO15400305 DCDC ConverterArduino_UNO_R3

DMM Feather Redux bill of materials (BOM)

60 components, 40 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TCA9536DGKR
ADS1115IDGS
U3
1
OPA333AIDBVR
ADuM1410
U4
1
LM317_TO-220
U5
1
LM4040DBZ-5
U6
1
IX4426N
U7
1
MAX1683
U8
1
LM4040DBZ-2.5
U10
1
ISO1540
U13
1
0305 DCDC Converter
U14
1
Arduino_UNO_R3
A1
1
MMBT3904
Q1
2
AO3400A MOSFET
Q2, Q8
2
Conn_01x02
J1, J2
1
Conn_01x12_Pin
J5
1
Conn_01x16_Pin
J6
2
Barrel_Jack
J7, J14
1
Out to Screen
J9
1
I_Input
J10
3
SW_Push
SW1, SW2, SW3
1
LED
D1
Show 20 more
QtyPartRefs
2
D_Schottky
D4, D5
2
4.7uF
C3, C5
8
0.1uF
C4, C7, C8, C10, C11, C13, C15, C17
1
1uF
C6
1
2.2uF
C9
2
10uF
C12, C14
3
4.7K
R1, R2, R27
1
62.0
R3
1
500
R4
1
1K
R5
1
100R
330.0
R8
1
22.0K
R9
1
75K
R10
2
0
R11, R12
1
200R
1M
R14
3
4.7K
240k
R17, R18, R20
1
4.7K
0
R19
1
240k
R21
1
15K
R24
1
R_Pack04_Split
RN1

DMM Feather Redux 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.

DMM Feather Redux: common questions

What microcontroller does the DMM Feather Redux use?

The DMM Feather Redux is built around the Arduino_UNO_R3, from the AVR/Arduino family.

How big is the DMM Feather Redux PCB?

The DMM Feather Redux measures 85.5 × 47.4 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the DMM Feather Redux?

60 components, from 40 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 DMM Feather Redux 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 DMM Feather Redux 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 DMM Feather Redux 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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