2 layers
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12 parts14kMIT
2 layers42 × 56 mm
Hermes Temp OLED
KnoxE67/Hermes_Temperature_ReaderBuilding a Custom Hermes project with a LM75AD_118, XIAO RP2040, and a 0.96” 128 X 64 OLED DISPLAY
- Size
- 42 × 56 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 23
- Pads
- 52
- Tracks, vias
- 67, 2
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 10 Apr 2026
- Updated
- 16 Apr 2026
Overview
Hermes Temp OLED is an open-source printed circuit board by KnoxE67, from the KnoxE67/Hermes_Temperature_Reader repository on GitHub. It is a 2-layer board of 42 × 56 mm with 12 parts on 23 nets, routed with 67 tracks and 2 vias.
Its parts include 3 resistors, 3 ICs and 1 capacitor. It belongs with the lEDs and displays boards and the RP2040 boards of this library.
README
README.mdHermes_Temperature_Reader
Building a Custom Hermes project with a LM75AD_118, XIAO RP2040, and a 0.96” 128 X 64 OLED DISPLAY
What?
So this project is about making something clean, cool, and something Im going to use for a long time. It uses a PCB, a XIAO RP2040, a SSD1306 OLED Display, a LM75AD,118 Temperature sensor, One 0.1 µF Ceramic Capacitor, Two 4.7k ohm Resistors, and One 10k ohm Resistor.
Why?
So I did the project so that I could learn how to build something using a Datasheet which I havn't done without help before, cool, nice, and something I would actual use unlike the Blueprint Projects: Custom Hackpad and RP2040 DevBoard. I also did this project because I was bored and waiting for my other project Pathfinder to get reviewed and approved.
Pictures
3D Model:
PCB:
Schematic:
BOM
| Name | Purpose | Quantity | Total Cost (USD) | Link | Distributor |
|---|---|---|---|---|---|
| PCB | To connect everything together | 5 | 5.31 | JLCPCB | |
| 10 kOhms ±5% 0.25W, 1/4W Through Hole Resistor Axial Carbon Film | Used to dampen the Temperature Sensors data, again got 9 extra because it was cheaper | 10 | 0.31 | https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF14JT10K0/1741265 | Digikey |
| 4.7 kOhms ±5% 0.5W, 1/2W Through Hole Resistor Axial Carbon Film | To pull up the SDA and SCL, got 8 extra becausae it was cheaper | 10 | 0.43 | https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF12JT4K70/1741152 | Digikey |
| 0.1 µF ±10% 25V Ceramic Capacitor X7R 0603 (1608 Metric) | It's a Cermanic Capacitor for the Temperature Sensor. Got some extra because again I'm going to manually solder these by hand. | 10 | 0.52 | https://www.digikey.com/en/products/detail/kemet/C0603C104K3RACTU/416044 | Digikey |
| LM75AD,118 Temperature Sensor Digital, Local -55°C ~ 125°C 11 b 8-SO | To get the temperature where ever it is powered, also got 1 extra because I'm going to be soldering this manually and not through JLCPCB. | 2 | 1.42 | https://www.digikey.com/en/products/detail/nxp-usa-inc/LM75AD-118/1692795 | Digikey |
| RP2040 XIAO RP2040 - ARM® Cortex®-M0+ MCU 32-Bit Embedded Evaluation Board | This is used to power the board | 1 | 5.15 | https://www.digikey.com/en/products/detail/seeed-technology-co-ltd/102010428/14672129 | Digikey |
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 4.7k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Vertical | R1, R2 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Vertical | R3 |
| 1 | DM-OLED096-636 | Screen:MODULE_DM-OLED096-636 | U3 |
| 1 | LM75AD_118 | Sensor:LM75AD_118 | U1 |
| 1 | LOGO | LOGO | G*** |
| 1 | XIAO-RP2040-DIP | xiao_series:XIAO-RP2040-DIP | U2 |
The 8 most common of 12 parts.
Questions
How big is the Hermes Temp OLED PCB?
It measures 42 × 56 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hermes Temp OLED use?
12 parts. 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 Hermes Temp OLED KiCad files?
From the KnoxE67/Hermes_Temperature_Reader repository on GitHub, at the commit this page was made from: the board is Hermes_PCB/Hermes_Temp_OLED.kicad_pcb and its schematic Hermes_PCB/Hermes_Temp_OLED.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hermes Temp OLED design in my own project?
Its repository states no licence, so its author keeps all rights: ask KnoxE67 before reusing the design.
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