2 layers100 × 44 mm
Opensolder
howie-j/opensolder
Fully open source JBC T245-compatible soldering station
69 parts55GPL-3.0
2 layers160 × 100 mm
Kneipp thermometer
MartinFeichtinger/kneippometerThis is a project to build an self-sufficient temperatur display for the local kneipp bath
- Size
- 160 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 140
- Nets
- 92
- Pads
- 484
- Tracks, vias
- 1,376, 75
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 17 Aug 2024
- Updated
- 26 Feb 2026
Overview
Kneipp thermometer is an open-source printed circuit board by MartinFeichtinger, from the MartinFeichtinger/kneippometer repository on GitHub. It is a 2-layer board of 160 × 100 mm with 140 parts on 92 nets, routed with 1,376 tracks and 75 vias.
It is built around the ATMEGA16A-PU, MAX4238ASA and ULN2003A, with the AO3418, BC327 and BC547 among its other parts. Its parts include 74 transistors, 28 resistors, 12 capacitors, 6 connectors and 5 ICs. It belongs with the sensors and measurement and lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
6
ATMEGA16A-PU
DIP-40-40℃~+85℃ 10bit 16KB 16MHz 1KB 2.7V~5.5V 32 512Byte 8 Bit AVR Built-in FLASH DIP-40 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)MAX4238ASA
SOIC8Ultra-Low Offset/Drift, Low-Noise, Precision AmplifiersMaxim Integrated (Analog Devices)Uncategorised
ULN2003A
SOP-16-40℃~+85℃ 0.93mA 100uA 15pF 20uA 30V 50V Seven channels SOP-16 Darlington Transistor Arrays ROHSUMWDarlington Transistor Arrays
AO3418
SOT-23-55℃~+150℃ 1 N-channel 1.5V 12nC@10V 25pF 285pF 3.8A 30V 45pF 55mΩ@10V SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
BC327
TO-921 PNP 100MHz 45V 5V 625mW 630 700mV 800mA PNP TO-92 Bipolar (BJT) ROHSDDFBipolar (BJT)BC547
TO-92Bipolar (BJT)Jiangsu Changjing Electronics Technology (CJ)
README
README.mdkneippometer
This is a project to build a self-sufficient temperatur display for the local kneipp bath.
power management
The Kneippometer is powered by a compact solar panel, with the generated solar energy stored in a 6V lead-acid battery. To optimize the charging process, we've developed an intelligent charge controller that tracks the Maximum Power Point (MPP) of the solar panel. This allows for charging at the highest possible and permissible power levels at all times.
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.
schematic
pcb layout
Parts
140| Qty | Value | Footprint | References |
|---|---|---|---|
| 37 | DMP 3098L7 DII | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q1, Q11, Q13, Q15, Q17, Q19, Q21, Q23, Q25, Q27, Q29, Q31, Q33, Q35, Q37, Q39 +21 |
| 35 | AO3418 | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q10, Q12, Q14, Q16, Q18, Q20, Q22, Q24, Q26, Q28, Q30, Q32, Q34, Q36, Q38, Q40 +19 |
| 8 | 2.2k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1, R14, R21, R22, R23, R24, R25, R26 |
| 8 | 2k2 | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R13, R15, R16, R17, R18, R19, R20, R27 |
| 4 | 100n | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C3, C4, C5, C7 |
| 4 | 7-Segment-Anzeige | 7-Segment-Anzeige:7-Segment-Anzeige | L2, L3, L4, L5 |
| 3 | 47k | Resistor_SMD:R_0805_2012Metric | R2, R3, R5 |
| 2 | 100nF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C9, C10 |
| 2 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R8, R11 |
| 2 | 22p | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C1, C2 |
| 2 | 5.6k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R6, R7 |
| 2 | ULN2003A | Package_DIP:DIP-16_W7.62mm_LongPads | U2, U3 |
| 1 | 0.1 | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R10 |
| 1 | 0R | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R28 |
| 1 | 100 | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R9 |
| 1 | 180k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R4 |
| 1 | 1k | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R12 |
| 1 | 1µF | Capacitor_THT:C_Radial_D10.0mm_H12.5mm_P5.00mm | C12 |
| 1 | 2.2mH | Inductor_THT:L_Radial_D24.4mm_P23.40mm_muRATA_1400series | L1 |
| 1 | 2.5A | footprints:Fuseholder5x20_horiz_open_inline_Type-I | F1 |
| 1 | 220µF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C6 |
| 1 | 22µF | Capacitor_THT:C_Radial_D10.0mm_H12.5mm_P5.00mm | C11 |
| 1 | 470µF | Capacitor_THT:CP_Radial_D8.0mm_P5.00mm | C8 |
| 1 | 4MHz | Crystal:Crystal_HC18-U_Vertical | Y1 |
| 1 | ATmega16A-PU | Package_DIP:DIP-40_W15.24mm | U1 |
| 1 | BATT | Connector:JWT_A3963_1x02_P3.96mm_Vertical | J1 |
| 1 | BC327 | Package_TO_SOT_THT:TO-92_HandSolder | Q3 |
| 1 | BC547 | Package_TO_SOT_THT:TO-92_HandSolder | Q2 |
| 1 | DP2X414 | Diode_SMD:D_SMF | D1 |
| 1 | ISP | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | J5 |
| 1 | LED | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D2 |
| 1 | MAX4238ASA | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4 |
| 1 | Rx/Tx | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J6 |
| 1 | SOLAR | Connector:JWT_A3963_1x02_P3.96mm_Vertical | J2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | TC1017-xCT | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | TempAir | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J3 |
| 1 | TempWater | Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical | J4 |
| 1 | TestPoint GND | Connector_PinHeader_2.00mm:PinHeader_1x02_P2.00mm_Vertical | GND |
The 136 most common of 140 parts.
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Questions
How big is the Kneipp thermometer PCB?
It measures 160 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Kneipp thermometer use?
140 parts, built around the ATMEGA16A-PU, MAX4238ASA, ULN2003A and AO3418. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Kneipp thermometer KiCad files?
From the MartinFeichtinger/kneippometer repository on GitHub, at the commit this page was made from: the board is Hardware/kneipp-thermometer.kicad_pcb and its schematic Hardware/halfBridge.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Kneipp thermometer design in my own project?
Its repository states no licence, so its author keeps all rights: ask MartinFeichtinger before reusing the design.