2 layers140.5 × 30 mm
Type e
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
16 parts3kApache-2.0
2 layers69.8 × 97.9 mm
Hrsens
spdidle/aqKittyaqKitty!!
- Size
- 69.8 × 97.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 27
- Pads
- 66
- Tracks, vias
- 92, 8
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 7 Apr 2026
- Updated
- 24 Apr 2026
Overview
Hrsens is an open-source printed circuit board by spdidle, from the spdidle/aqKitty repository on GitHub. It is a 2-layer board of 69.8 × 97.9 mm with 16 parts on 27 nets, routed with 92 tracks and 8 vias.
Its parts include 4 ICs, 3 capacitors, 3 resistors and 1 diode. It belongs with the RP2040 boards of this library.
README
README.mdaqkitty
The aqKitty is a kitty shaped PCB that detects air quality, humidity, and temperature, then displays current condition on an OLED screen. Also, its a kitty :3
I made this project to solidify my understanding in KiCad, and my general electronics understanding! I felt that after the blinky board, I wanted to learn much more and do more with KiCad, so I decided to follow the Hermes tutorial on Stasis (although no, I didn't submit to Stasis).
I made this project primarily using KiCad, and used EasyEDA for symbols & footprints of the temp and AQ sensors!
This time around, building this PCB was definitely a step up from the blinky board, because it required more understanding of power nets, decoupling capacitors, pullup resistors, net labels, and efficient PCB layout strategies. I struggled the first time building this because I thought I could just add a sensor and microcontroller and call it a day. I then learned lots of things about slightly more complicated PCBs, requiring more than one capacitor, resistor, and other things.
Overall I had lots of fun making this project and I think it turned out super cute! I will definitely consider building it once I get a heat gun for the sensors >:)
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | LOGO | LOGO | G***, G***, G***, G*** |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2 |
| 2 | 4.7K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 1 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3 |
| 1 | 330R | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | ENS160 | ENS160 BGLM Model:XDCR_ENS160-BGLM | U1 |
| 1 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | OLED_0.91_128x32 | Hackclub Footprints:OLED_0.91_128x32 | U3 |
| 1 | SHT30 | Sensor_Humidity:Sensirion_DFN-8-1EP_2.5x2.5mm_P0.5mm_EP1.1x1.7mm | U4 |
| 1 | XIAO-RP2040-DIP | Hackclub Footprints:XIAO-RP2040-DIP | U2 |
The 15 most common of 16 parts.
Questions
How big is the Hrsens PCB?
It measures 69.8 × 97.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hrsens use?
16 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 Hrsens KiCad files?
From the spdidle/aqKitty repository on GitHub, at the commit this page was made from: the board is aqkitty!/hrsens.kicad_pcb and its schematic aqkitty!/hrsens.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hrsens design in my own project?
Its repository states no licence, so its author keeps all rights: ask spdidle before reusing the design.
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