2 layers142 × 208 mm
2 layers133 × 20 mm
Panel
romkey/sensrSensor project hardware - ESP32-S3 base board, light and air sensors
- Size
- 133 × 20 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 138
- Nets
- 65
- Pads
- 288
- Tracks, vias
- 340, 65
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 14 Aug 2025
- Updated
- 5 Nov 2026
Overview
Panel is an open-source printed circuit board by romkey, from the romkey/sensr repository on GitHub, published under the MIT licence. It is a 2-layer board of 133 × 20 mm with 138 parts on 65 nets, routed with 340 tracks and 65 vias.
It is built around the LTR-390UV-01, TSL25911FN and CL21B104KBCNNNC, with the CL21A106KOQNNNE and SM04B-SRSS-TB(LF)(SN) among its other parts. Its parts include 20 capacitors, 15 resistors, 15 connectors, 10 ICs and 5 diodes.
Main components
5
LTR-390UV-01
SMD-6P,2x2mm-40℃~+85℃ 1.7V~3.6V 157klx 18bit 1uA 2mm 2mm I2C Light Intensity Low power/sleep mode、Spectral correction/filtering、Adjustable gain control、Interrupt/event trigger、Built-in temperature compensation SMD-6P,2x2mm Ambient Light Sensors ROHSLite-OnAmbient Light Sensors
TSL25911FN
DFN-6(2x2.2)-30℃~+70℃ 2.7V~3.6V I2C Light Intensity DFN-6(2x2.2) Ambient Light Sensors ROHSAdvanced Monolithic SystemsAmbient Light Sensors
CL21B104KBCNNNC
0805100nF 50V X7R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMTCL21A106KOQNNNE
080510uF 16V X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
SM04B-SRSS-TB(LF)(SN)
SMD,P=1mm,卧贴-25℃~+85℃ 1 1A 1mm 1x4P 2.9mm 4 4.32mm 4P 50V 6mm Auxiliary Solder Pin Copper alloy PA SH Surface Mount, Right Angle Tin UL94V-0 White SMD,P=1mm,卧贴 Wire To Board Connector ROHSJSTWire To Board Connector
README
README.mdSensr
Sensr is a group of hardware projects intended for environmental sensing.
It currently consists of:
- base board - ESP32-S3 with accelerometer, I2S microphone header, display header, 2 Qwiic ports, particle counter connector
- air - SCD40 CO2 + BME680 temperature/humidity/pressure sensor
- air-stcc4 - new STCC4 CO2 sensor + SHT40 temperature/humidity sensor
- light - TSL25911 light
- light-ltr390uv - LTR390 UV sensor + TSL25911 light sensor
Sensr is an ESP32 S3-based microcontroller intended for environmental sensing, as well as separate sensor boards.
I2C Addresses
0x29 TSL25911 0x74 AS7331 0x49 AS7341 0x53 LT-390
0x76 BME680 0x62 SCD40 0x59 SGP40 0x5D SFA30 0x44 SHT3X-D
0x6A LSM6DS3TR-C
Gas: 0x64 0x65 0x66 0x67 0x68 0x69 0x6B
bodged I2S
SCK - CS - 10 SD - RESET - 9 WS - DC - 46 L/R - SDI (MOSI) - 16
License
Hardware is shared under the CERN-OHL-S-2.0 license.
Software is shared under the MIT license.
Documentation is shared under the CC-BY-SA-4.0 - Attribution-ShareAlike license.
Parts
138| Qty | Value | Footprint | References |
|---|---|---|---|
| 48 | NPTH | NPTH | KiKit_MB_1_1, KiKit_MB_1_2, KiKit_MB_1_3, KiKit_MB_1_4, KiKit_MB_1_5, KiKit_MB_1_6, KiKit_MB_2_1, KiKit_MB_2_2, KiKit_MB_2_3, KiKit_MB_2_4, KiKit_MB_2_5, KiKit_MB_2_6, KiKit_MB_3_1, KiKit_MB_3_2, KiKit_MB_3_3, KiKit_MB_3_4 +32 |
| 20 | MountingHole_2.2mm_M2 | MountingHole:MountingHole_2.2mm_M2 | M1, M1, M1, M1, M1, M2, M2, M2, M2, M2, M3, M3, M3, M3, M3, M4 +4 |
| 10 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C1, C1, C1, C1, C3, C3, C3, C3, C3 |
| 10 | 10µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C2, C2, C2, C2, C4, C4, C4, C4, C4 |
| 10 | 4.7K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R2, R2, R2, R2, R3, R3, R3, R3, R3 |
| 10 | SM04B-SRSS-TB_(LF)(SN) | footprint:CONN-SMD_4P-P1.00_SM04B-SRSS-TB-LF-SN | J1, J1, J1, J1, J1, J3, J3, J3, J3, J3 |
| 5 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R1, R1, R1, R1 |
| 5 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2, J2, J2, J2, J2 |
| 5 | LTR-390UV-01 | EasyEDA:SENSOR-SMD_LTR-390UV-01 | U1, U1, U1, U1, U1 |
| 5 | PWR | LED_SMD:LED_0805_2012Metric | D1, D1, D1, D1, D1 |
| 5 | TSL25911FN | EasyEDA:DFN-6_L2.4-W2.0-P0.65-BL | U2, U2, U2, U2, U2 |
The 133 most common of 138 parts.
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Questions
How big is the Panel PCB?
It measures 133 × 20 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Panel use?
138 parts, built around the LTR-390UV-01, TSL25911FN, CL21B104KBCNNNC and CL21A106KOQNNNE. 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 Panel KiCad files?
From the romkey/sensr repository on GitHub, at the commit this page was made from: the board is hw/light-ltr390uv/0.1/panel.kicad_pcb and its schematic hw/air-stcc4/0.1.0/air-stcc4.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Panel design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).