2 layers68 × 87 mm
2 layers25.4 × 50.8 mm
Compact sqm
JWehle/compact_sqmA compact sky quality meter built on a custom PCB.
- Size
- 25.4 × 50.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 51
- Pads
- 141
- Tracks, vias
- 281, 28
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 19 Jan 2025
- Updated
- 31 Jan 2025
Overview
Compact sqm is an open-source printed circuit board by JWehle, from the JWehle/compact_sqm repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 25.4 × 50.8 mm with 36 parts on 51 nets, routed with 281 tracks and 28 vias.
It is built around the CH340C, ESP-12F and TSL25911FN, with the TLV70233DBVR(MS) and MMBT3904 among its other parts. Its parts include 13 resistors, 8 capacitors, 5 ICs, 2 transistors and 1 diode. It belongs with the ESP8266 boards of this library.
Main components
5
CH340C
SOP-16-20℃~+70℃ 2Mbps 3.3V、5V 50uA 7mA Transceiver USB 2.0 SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
ESP-12F
SMD,24x16mm-40℃~+85℃ -96dBm 15dBm 2.4GHz 3.3V 375mA 55mA PCB UART WIFI4 SMD,24x16mm WiFi Modules ROHSDOITWiFi Modules
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
TLV70233DBVR(MS)
SOT-23-5-40℃~+125℃@(Tj) 1 180mV@(300mA) 2uA 3.3V 300mA 5.5V 75dB@(1kHz) Enable Fixed Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
README
README.mdcompact_sqm
A compact sky quality meter built on a custom PCB.
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 12K | Resistor_SMD:R_0603_1608Metric | R5, R6, R7, R8, R9, R10, R11, R12, R13 |
| 5 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C3, C5, C6, C7, C8 |
| 4 | M2 | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | 10uF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C4 |
| 2 | 499 | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 2 | 5.1K | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 1 | Battery_Cell | Connector_PinHeader_2.54mm:PinHeader_2x01_P2.54mm_Vertical | BT1 |
| 1 | CH340C | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U4 |
| 1 | ESP-12F | RF_Module:ESP-12E | U3 |
| 1 | LED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | MCP73831-2-OT | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | SW_SPDT | Button_Switch_SMD:SW_SPDT_PCM12 | SW1 |
| 1 | TLV70233DBVR | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | TSL25911FN | OptoDevice:AMS_TSL25911FN | U1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4110 | J1 |
Questions
How big is the Compact sqm PCB?
It measures 25.4 × 50.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Compact sqm use?
36 parts, built around the CH340C, ESP-12F, TSL25911FN and TLV70233DBVR(MS). 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 Compact sqm KiCad files?
From the JWehle/compact_sqm repository on GitHub, at the commit this page was made from: the board is compact_sqm/compact_sqm.kicad_pcb and its schematic compact_sqm/compact_sqm.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Compact sqm design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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