HardLabs

Kneippometer

MartinFeichtinger·kneippometer·Hardware/kneipp-thermometer.kicad_pcb

Kneippometer PCB layout, top view — open source AVR/Arduino board by MartinFeichtinger

About the Kneippometer PCB

Kneippometer is an open source AVR/Arduino PCB design by MartinFeichtinger, published on GitHub. It is a 2-layer board measuring 160 × 100 mm, with 135 components from 38 distinct parts.

Its main chip is the ATmega16A-PU, from the AVR/Arduino family. Other key parts include the ULN2003A, MAX4238ASA and TC1017-xCT. By type, the board carries 74 transistors, 28 resistors, 12 capacitors, 6 connectors, 5 ICs and 5 inductors.

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

From the project

This is a project to build an self-sufficient temperatur display for the local kneipp bath

The display consists of four 7-segment flip-disk indicators, chosen specifically to minimize power consumption. These indicators only require energy during the flipping process, ensuring efficient operation.

Kneippometer, from the project README
From the project README

Main components on the Kneippometer

ATmega16A-PUULN2003AMAX4238ASATC1017-xCT

Kneippometer bill of materials (BOM)

135 components, 38 distinct parts.

QtyPartRefs
1
ATmega16A-PU
U1
2
ULN2003A
U2, U3
1
MAX4238ASA
U4
1
TC1017-xCT
U5
37
DMP 3098L7 DII
Q1, Q4, Q5, Q7, Q9, Q11, Q13, Q15 +29
1
BC547
Q2
1
BC327
Q3
35
AO3418
Q6, Q8, Q10, Q12, Q14, Q16, Q18, Q20 +27
1
4MHz
Y1
1
BATT
J1
1
SOLAR
J2
1
TempAir
J3
1
TempWater
J4
1
ISP
J5
1
Rx/Tx
J6
1
2.5A
F1
1
SW_Push
SW1
1
DP2X414
D1
1
LED
D2
1
2.2mH
L1
Show 18 more
QtyPartRefs
4
7-Segment-Anzeige
L2, L3, L4, L5
2
22p
C1, C2
4
100n
C3, C4, C5, C7
1
220µF
C6
1
470µF
C8
2
100nF
C9, C10
1
22µF
C11
1
1µF
C12
8
2.2k
R1, R14, R21, R22, R23, R24, R25, R26
3
47k
R2, R3, R5
1
180k
R4
2
5.6k
R6, R7
2
10k
R8, R11
1
100
R9
1
0.1
R10
1
1k
R12
8
2k2
R13, R15, R16, R17, R18, R19, R20, R27
1
0R
R28

Kneippometer design files

The KiCad project lives in the MartinFeichtinger/kneippometer repository on GitHub; these links point at the commit this page was built from.

Kneippometer: common questions

What microcontroller does the Kneippometer use?

The Kneippometer is built around the ATmega16A-PU, from the AVR/Arduino family.

How big is the Kneippometer PCB?

The Kneippometer measures 160 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Kneippometer?

135 components, from 38 distinct parts. The full bill of materials is listed on this page.

Where can I download the Kneippometer design files?

From the MartinFeichtinger/kneippometer repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Kneippometer design in my own project?

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

Can I test firmware for the Kneippometer 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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