HardLabs

Esr meter

vpatkov·esr-meter·hardware/esr-meter.kicad_pcb

Esr meter PCB layout, top view — open source AVR/Arduino board by vpatkov
Simulate this board

About the Esr meter PCB

Esr meter is an open source AVR/Arduino PCB design by vpatkov, published on GitHub. It is a 2-layer board measuring 66 × 99.1 mm, with 101 components from 43 distinct parts.

Its main chip is the ATMEGA88PA-AU, from the AVR/Arduino family. Other key parts include the MCP73831, TPS60403, TLV431, OPA1678 and QDSP-6064. By type, the board carries 44 resistors, 24 capacitors, 11 diodes, 9 transistors, 8 ICs and 4 connectors.

It belongs with the power & battery designs in this gallery.

From the project

AC ohmmeter

This device measures impedance at 100 kHz in assumption it's resistive[^1], basically an AC ohmmeter. Not for laboratory measurements, but for troubleshooting. The main usage is to find dried out electrolytic capacitors in aged electronics. Also may be used for continuity testing in a circuit containing inductors or transformers (it may be hard to distinguish a short from a winding at DC), or for finding shorted windings.

Esr meter, from the project README
From the project README

Main components on the Esr meter

MCP73831TPS60403TLV431OPA1678ATMEGA88PA-AUQDSP-6064

Esr meter bill of materials (BOM)

101 components, 43 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MCP73831
U1
1
TPS60403
U2
1
TLV431
U3
3
OPA1678
U4, U5, U8
1
ATMEGA88PA-AU
ATmega88PA-AU
U6
1
QDSP-6064
U7
7
DTC114E
Q1, Q3, Q4, Q6, Q7, Q8, Q9
1
IRLML6402
Q2
1
MMBFJ113
Q5
1
USB_B_Micro
J1
1
JST-XH
J2
1
Pin Header Male
J3
1
Binding Post
J4
1
SW_Push
SW1
1
SMAJ5.0A
D1
1
RED
D2
1
GREEN
D3
5
BAS316
D4, D5, D6, D7, D9
1
BAT54J
D8
2
SM4007
D10, D11
Show 23 more
QtyPartRefs
2
4.7μ
C1, C6
3
1μ
C2, C4, C5
11
100N
100n
C3, C8, C16, C17, C18, C19, C20, C21 +3
4
10N
10n
C7, C9, C10, C15
1
DNP
C11
3
1n
C12, C13, C14
3
33K
33k
R1, R6, R22
1
3.3K
3.3k
R2
2
3k
R3, R4
5
10K
10k
R5, R8, R9, R10, R18
1
31.6K
31.6k
R7
1
100
R11
2
100K
100k
R12, R13
5
1k
R14, R15, R19, R26, R37
1
DNP
R16
2
1.58K
1.58k
R17, R23
1
3.3M
R20
1
2.2K
2.2k
R21
1
499
R24
1
10
R25
8
2.4K
2.4k
R27, R28, R29, R30, R31, R32, R33, R34
8
10
R35, R36, R38, R39, R41, R42, R43, R44
1
45.3K
45.3k
R40

Esr meter design files

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

Esr meter: common questions

What microcontroller does the Esr meter use?

The Esr meter is built around the ATMEGA88PA-AU, from the AVR/Arduino family.

How big is the Esr meter PCB?

The Esr meter measures 66 × 99.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Esr meter?

101 components, from 43 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 Esr meter design files?

From the vpatkov/esr-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 Esr meter design in my own project?

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

Can I test firmware for the Esr meter 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.

Similar boards