KairosV2
About the KairosV2 PCB
KairosV2 is an open source Microchip SAM PCB design by valex2, published on GitHub. It is a 4-layer board measuring 99 × 41.5 mm, with 82 components from 35 distinct parts.
Its main chip is the ATSAMD51J19A-AUT, from the Microchip SAM family. Other key parts include the MCP73831, AP2112K-3.3V, LTR-329ALS-01, 74AHC1G125 and BME688. By type, the board carries 24 resistors, 22 capacitors, 15 connectors, 7 ICs, 7 jumpers and 3 diodes.
It belongs with the power & battery, sensors and iot & wireless designs in this gallery.
From the project
This is driven by the worsening air quality due to climate change, particularly in regions like California where wildfires contribute to increased particulate matter in the atmosphere. Affordable sensors, such as Kairos, offer a scalable solution for monitoring air quality across
This is driven by the worsening air quality due to climate change, particularly in regions like California where wildfires contribute to increased particulate matter in the atmosphere. Affordable sensors, such as Kairos, offer a scalable solution for monitoring air quality across large areas, providing national agencies with valuable data to analyze climate patterns, identify hotspots, and allocate resources more effectively.
Main components on the KairosV2
KairosV2 bill of materials (BOM)
82 components, 35 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATSAMD51J19A-AUT Microchip Technology | TQFP64_PT_MCH | U1 |
| 1 | MCP73831 Microchip Technology | SOT-23-5 | U2 |
| 1 | AP2112K-3.3V AP2112k-3.3V Diodes Incorporated | SOT-23-5 | U3 |
| 1 | LTR-329ALS-01 Lite-On Inc. | LTR-329ALS-01_LTO | U4 |
| 2 | 74AHC1G125 Texas Instruments | SOT-23-5_HandSoldering | U5, U7 |
| 1 | BME688 Bosch Sensortec | Bosch_LGA-8_3x3mm_P0.8mm_ClockwisePinNumbering | U6 |
| 1 | DMG3415U-7 Diodes Incorporated | SOT-23-3 | Q1 |
| 1 | 32.768KHZ 32.768kHz Hosonic Electronic Co., Ltd | Crystal_SMD_3215-2Pin_3.2x1.5mm | X1 |
| 2 | Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J1, J6 |
| 2 | Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J2, J3 |
| 1 | 3221-10-0300-00 CNC Tech | CONN10_3221-10-0300-00_CNC | J4 |
| 5 | Conn_01x04 | PinHeader_1x04_P2.54mm_Vertical | J5, J8, J11, J12, J15 |
| 1 | Conn_01x06 | PinHeader_1x06_P2.54mm_Vertical | J7 |
| 1 | 10118192-0001LF Amphenol ICC (FCI) | USB_Micro_B_Female_10118192 | J10 |
| 1 | 1935161 Phoenix Contact | Terminal_Block_D1.3mm_P5mm | J13 |
| 1 | 2908-05WB-MG 3M | MicroSD_2908-05WB-MG | J14 |
| 1 | Conn_01x08 | PinHeader_1x08_P2.54mm_Vertical | J16 |
| 7 | SolderJumper_2_Open | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP1, JP2, JP3, JP4, JP5, JP6, JP7 |
| 1 | B3U-1000P Omron Electronics Inc-EMC Div | Switch_Tactile_SMD_B3U-1000P | S1 |
| 1 | WS2812B Adafruit | LED_WS2812B-2020_PLCC4_2.0x2.0mm | D1 |
Show 15 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Schottky onsemi | D_SOD-123F | D2 |
| 1 | LED QT Brightek (QTB) | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3 |
| 1 | 31 Ohm at 100 MHz Laird-Signal Integrity Products | L_0805_2012Metric_Pad1.05x1.20mm_HandSolder | L1 |
| 2 | 22PF 22pF KEMET | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2 |
| 4 | 0.1U 0.1u YAGEO | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C4, C21, C22 |
| 9 | 1u YAGEO | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C5, C6, C7, C9, C12, C15, C16, C19 +1 |
| 5 | 10U 10u Taiyo Yuden | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C8, C10, C13, C14, C18 |
| 2 | 4.7U 4.7u Samsung Electro-Mechanics | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C11, C17 |
| 3 | 100K 100k YAGEO | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R5 |
| 3 | 10K Stackpole Electronics Inc | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4, R7 |
| 1 | 1K YAGEO | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | 2k Panasonic Electronic Components | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8 |
| 4 | 3.3K 3.3k Stackpole Electronics Inc | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9, R10, R21, R22 |
| 8 | 0 Stackpole Electronics Inc | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R11, R12, R13, R14, R19, R20, R23, R24 |
| 4 | 47K 47k Stackpole Electronics Inc | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R15, R16, R17, R18 |
KairosV2 design files
The KiCad project lives in the valex2/kairos repository on GitHub; these links point at the commit this page was built from.
KairosV2: common questions
What microcontroller does the KairosV2 use?
The KairosV2 is built around the ATSAMD51J19A-AUT, from the Microchip SAM family.
How big is the KairosV2 PCB?
The KairosV2 measures 99 × 41.5 mm, has 4 copper layers and is 1.769872 mm thick.
How many components are on the KairosV2?
82 components, from 35 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the KairosV2 design files?
From the valex2/kairos repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the KairosV2 design in my own project?
The repository has no license, so all rights stay with valex2. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the KairosV2 without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Microchip SAM firmware against it before you order a PCB.
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