2 layers132.1 × 45.7 mm
IPoS
peterheinrich/InternetOverSpaghetti
Transmitting IP packages over a pair of spaghetti thus demonstrating how media independent IP really is.
42 parts342
2 layers54.1 × 30.5 mm
Tmp
0x007E/tmpTemperature Warning
- Size
- 54.1 × 30.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 38
- Nets
- 20
- Pads
- 72
- Tracks, vias
- 65, 25
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Oct 2024
- Updated
- 28 Sep 2026
Overview
Tmp is an open-source printed circuit board by 0x007E, from the 0x007E/tmp repository on GitHub. It is a 2-layer board of 54.1 × 30.5 mm with 38 parts on 20 nets, routed with 65 tracks and 25 vias.
It is built around the LM358. Its parts include 11 resistors, 4 connectors, 2 capacitors, 2 diodes and 1 IC.
Main components
1README
README.md
TMP - Temperature Warning (Temperaturwarnung)
The TMP is a board with an LM358 or any other 2-channel operational amplifier. The board itself is driven with a voltage of 5V. It converts the temperature (0° - 100°) from an KTY81/210 to a voltage. This voltage can be coupled onboard with a Schmitt-Trigger to change the status of the connected LEDs (green, red).
Optional the converted temperature can be digitalized through an A/D converter and sent to a terminal through UART. A demo how this can be done is attached and can be tested with an ATmega16A.
| Experience | Level |
|---|---|
| Soldering | |
| Software |
Downloads
| Type | File | Description |
|---|---|---|
| Simulation | asc | LTSpice Simulation |
| Lochmaster | lm4 | Stripe grid circuit board |
| Schematic | pdf / cadlab | Schematic files |
| Board | pdf / cadlab | Board file |
| Drill | Drill file | |
| BoM | xlsx / html | Bill of Material as Excel/interactive HTML |
| PCB | zip / tar | KiCAD/Gerber/BoM/Drill files |
| Firmware | zip / tar | Demo Firmware for ATmega16 |
Hardware
The pcb is created with KiCAD. All files are built with github actions so that they are ready for a production environment.
PCB
The circuit board is populated on one side. The best way for soldering the SMD components is within a vapor phase soldering system and for the THT components with a standard system.
Top Layer
Bottom Layer
Configuration
To configure the TMP some reference voltages needs to be modified. The reference of TP2 has to be around ~1V and is adjusted through RV1. On J2 the KTY81/210 should be connected. To setup the amplification a mutimeter with temperature measurement function is needed. The voltage on TP3 can be calculated through the following equation:
$U_{TP3}=\frac{2.5}{100}*𝜗+1$
Calculate $U_{TP3}$ with the current temperature and setup the voltage on TP3 to the calculated value with RV2. The Equation is Designed for the following parameters:
| $U_{TP3}/[V]$ | Temperature $𝜗/[°C]$ |
|---|---|
| 1 | 0 |
| 3.5 | 100 |
On Jumper J3/1 the generated voltage from the captured temperature can be measured. To connect the temperature measurement to the warning system jumper J3 has to be shorten.
With RV3 the limit to generate a state change of the leds can be set to a value between 2° to 98°. With RV4 the hysteresis of the Schmitt-Trigger can be adjusted.
Software
The demo firmware (ATmega16A) of the TMP can be used to digitalize the voltage with an A/D converter and transmit the data over uart to a terminal.
Dataflow diagram
Structogram
Additional Information
| Type | Link | Description |
|---|---|---|
| LM358 | Dual operational amplifier | |
| KTY81 | Temperature sensor 2 k0hm | |
| ATmega16A | Microchip ATmega16A Datasheet |
R. GAECHTER
Parts
38| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | TestPoint_Probe | TestPoint:TestPoint_Pad_D1.5mm | TP1, TP2, TP3, TP4, TP5 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2, H3, H4 |
| 2 | 1k | Resistor_SMD:R_1206_3216Metric | R5, R7 |
| 2 | 250k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV2, RV4 |
| 2 | 270 | Resistor_SMD:R_1206_3216Metric | R8, R9 |
| 2 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J3 |
| 1 | 0 | Resistor_SMD:R_1206_3216Metric | R11 |
| 1 | 0 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R10 |
| 1 | 100m | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | 100n | Capacitor_SMD:C_1206_3216Metric | C2 |
| 1 | 100u | Capacitor_SMD:CP_Elec_8x6.5 | C1 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV3 |
| 1 | 200 | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | 330 | Resistor_SMD:R_1206_3216Metric | R2 |
| 1 | 33k | Resistor_SMD:R_1206_3216Metric | R6 |
| 1 | 3k9 | Resistor_SMD:R_1206_3216Metric | R4 |
| 1 | 6k2 | Resistor_SMD:R_1206_3216Metric | R1 |
| 1 | BIN | Symbol:WEEE-Logo_4.2x6mm_SilkScreen | FID2 |
| 1 | Conn_01x02_Pin | Connector_Wago_SMD:WAGO_2060-402_998-404 | J2 |
| 1 | Conn_01x03_Socket | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | ESD | Symbol:ESD-Logo_6.6x6mm_SilkScreen | FID1 |
| 1 | Green | LED_SMD:LED_1206_3216Metric | D1 |
| 1 | LM358 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | OH | Symbol:OSHW-Logo_5.7x6mm_SilkScreen | FID3 |
| 1 | QR | Images:QR_0x007e | FID4 |
| 1 | Red | LED_SMD:LED_1206_3216Metric | D2 |
| 1 | opt. | Resistor_SMD:R_1206_3216Metric | R3 |
Questions
How big is the Tmp PCB?
It measures 54.1 × 30.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Tmp use?
38 parts, built around the LM358. 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 Tmp KiCad files?
From the 0x007E/tmp repository on GitHub, at the commit this page was made from: the board is pcb/TMP.kicad_pcb and its schematic pcb/TMP.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Tmp design in my own project?
Its repository states no licence, so its author keeps all rights: ask 0x007E before reusing the design.
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