2 layers15.3 × 19.3 mm
Kicad hx711 tyny85
IvDm/Z-probe-on-smd-resistors-2512
Auto bed level strain gage for 3D printer using resistors 2512 instead of strain gauges.
18 parts150GPL-3.0
2 layers23.5 × 27.4 mm
Keychain uv index
clovisf/keychain-uv-indexUV index indicator with Attiny85 and CR2032 battery, keychain-sized
- Size
- 23.5 × 27.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 14
- Pads
- 50
- Tracks, vias
- 106, 15
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Oct 2024
- Updated
- 23 May 2026
Overview
Keychain uv index is an open-source printed circuit board by clovisf, from the clovisf/keychain-uv-index repository on GitHub. It is a 2-layer board of 23.5 × 27.4 mm with 16 parts on 14 nets, routed with 106 tracks and 15 vias.
It is built around the ATTINY85V-10SU and LM358. Its parts include 6 resistors, 3 capacitors, 2 ICs, 2 diodes and 1 connector. It belongs with the power boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATTINY85V-10SU
SOIC-8-208mil-40℃~+85℃ 1.8V~5.5V 10MHz 10bit 512Byte 512Byte 6 8 Bit 8KB AVR Built-in FLASH SOIC-8-208mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LM358
SOP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 24mA 3V~36V 500uA 50nA 5mV 80dB Built-in compensation SOP-8 Operational Amplifier ROHSMSKSEMIOperational Amplifier
README
README.mdkeychain-uv-index
A keychain-sized UV index indicator, showing the UV index number by blinking a LED accordingly. Attiny85 controller and CR2032 battery. https://fritzenlab.net
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 1k | Resistor_SMD:R_0805_2012Metric | R2, R4, R6 |
| 2 | 100n | Capacitor_SMD:C_0805_2012Metric | C1, C3 |
| 1 | 10M | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 22p | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | 3k3 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 5k6 | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | ATtiny85V-10S | Package_SO:SOIC-8W_5.3x5.3mm_P1.27mm | U1 |
| 1 | Battery_Cell | Battery:Battery_Panasonic_CR2032-HFN_Horizontal_CircularHoles | BT1 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
| 1 | GUVA-S12D | LED_SMD:LED_PLCC-2_3.4x3.0mm_AK | D2 |
| 1 | LED | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | LM358 | Package_SO:SOIC-8W_5.3x5.3mm_P1.27mm | U2 |
| 1 | SW_Push_Dual | Button_Switch_SMD:SW_SPST_PTS810 | SW1 |
Questions
How big is the Keychain uv index PCB?
It measures 23.5 × 27.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Keychain uv index use?
16 parts, built around the ATTINY85V-10SU and 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 Keychain uv index KiCad files?
From the clovisf/keychain-uv-index repository on GitHub, at the commit this page was made from: the board is keychain-uv-index.kicad_pcb and its schematic keychain-uv-index.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keychain uv index design in my own project?
Its repository states no licence, so its author keeps all rights: ask clovisf before reusing the design.
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