2 layers
L2 MCU
tachin-r/Pyranometer_Over_engineering
Modular High-Precision Pyranometer KiCad Hardware Project.
4 parts
4 layers
L1 Analog BPW34
tachin-r/Pyranometer_Over_engineeringModular High-Precision Pyranometer KiCad Hardware Project.
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 32
- Pads
- 111
- Tracks, vias
- 260, 40
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 15 Oct 2026
- Updated
- 7 Nov 2026
Overview
L1 Analog BPW34 is an open-source printed circuit board by tachin-r, from the tachin-r/Pyranometer_Over_engineering repository on GitHub. It is a 4-layer board with 36 parts on 32 nets, routed with 260 tracks and 40 vias.
It is built around the TPS7A4901DGNR and BPW34. Its parts include 16 capacitors, 12 resistors, 4 ICs, 2 connectors and 1 diode.
Main components
2
TPS7A4901DGNR
HVSSOP-8-40℃~+125℃@(Tj) 1 1.194V~33V 15.4uVrms 150mA 260mV@(100mA) 35V 49uA 72dB@(120Hz) Adjustable Positive Under Voltage Lockout、Over Current Protection、Over Temperature Protection、Enable HVSSOP-8 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BPW34
插件,P=5.1mm-40℃~+100℃ 215mW 2nA 430nm~1100nm 60V 900nm ±65° 插件,P=5.1mm Photodiodes ROHSVishay IntertechnologyPhotodiodes
README
README.mdPyranometer Over-engineering ☀️⚡
Modular High-Precision Pyranometer KiCad Hardware Project.
📑 Project Structure & Interactive Online Viewers
Explore the schematics and PCB layouts interactively directly in your browser powered by KiCanvas (no installation required):
| Board / Module | Description | Interactive Project (Schematic + PCB) | Schematic Only | PCB Only |
|---|---|---|---|---|
| L1_Analog | Analog Front-End & Sensor Interface | 🚀 Open L1 Board | 🔍 Schematic | 🔍 PCB |
| L2_MCU | Microcontroller Processing Board | 🚀 Open L2 Board | 🔍 Schematic | 🔍 PCB |
| L3_Switching | Power Management & Switching Regulators | 🚀 Open L3 Board | 🔍 Schematic | 🔍 PCB |
| LM2596 HW-411 | Reverse-Engineered Buck Converter Module | 🚀 Open LM2596 | 🔍 Schematic | 🔍 PCB |
🛠️ Boards Overview
1. L1_Analog (Sensor Front-End)
- Precision Analog Signal Conditioning stage designed for low-noise measurement of solar irradiance sensor signals (Pyranometer Thermopile / Photodiode).
2. L2_MCU (Processing & Control)
- Primary microcontroller board responsible for high-resolution ADC sampling, calibration algorithms, digital filtering, and telemetry communication.
3. L3_Switching (Power Distribution)
- Power supply unit (PSU) providing efficient switching regulation, clean power rail generation, and noise filtering for sensitive analog circuitry.
4. reverse_component/LM2596_HW411
- Reverse-engineered KiCad schematic and PCB layout of the common LM2596 HW-411 DC-DC step-down converter module, used for reference, testing, and validation.
🚀 Working with KiCad
This project is organized as a modular multi-board system:
- Each sub-directory contains its own standalone KiCad project file (
.kicad_pro). - To view or edit a board, open the corresponding
.kicad_profile inside its respective directory.
🔬 Capstone Documentation & Laboratory Calibration
- ☀️ Solar Simulator Preparation & Contact Guide [blocked]: Contact templates, technical phone checklists, and procedures for using the Solar Light XPS-300 at ATTAC / Nano Central Lab (Building 55, 3rd Floor).
- 📷 Perfboard Photo & Figure Insertion Guide [blocked]: Complete image checklist and tips for inserting hardware photos into the report.
- 📄 Capstone Progress Report V2 (.docx) [blocked]: Official 5-chapter thesis report draft formatted to KMITL guidelines.
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C2, C8, C9, C12, C14, C15 |
| 5 | 47R | Resistor_SMD:R_0805_2012Metric | R8, R9, R10, R11, R12 |
| 4 | 1uF | Capacitor_SMD:C_0805_2012Metric | C3, C4, C11, C13 |
| 3 | 10uF | Capacitor_SMD:C_0805_2012Metric | C6, C10, C16 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric | R4, R7 |
| 2 | 10nF | Capacitor_SMD:C_0805_2012Metric | C5, C7 |
| 2 | Conn_01x05_Socket | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J1, J2 |
| 1 | 100R | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | 100k | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 10K | Samacsys:103AT2 | RT1 |
| 1 | 10pF (C0G/NP0) | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 2.2kR | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 20k | Resistor_SMD:R_0805_2012Metric | R6 |
| 1 | 68k | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | ADS1220xPW | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U1 |
| 1 | BPW_34 | Samacsys:BPW34 | D1 |
| 1 | OPA380AIDR | Samacsys:SOIC127P600X175-8N | IC1 |
| 1 | REF5045AIDGKR | Samacsys:SOP65P490X110-8N | IC3 |
| 1 | TPS7A4901DGNR | Samacsys:SOP65P490X110-9N | IC2 |
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Questions
What parts does the L1 Analog BPW34 use?
36 parts, built around the TPS7A4901DGNR and BPW34. 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 L1 Analog BPW34 KiCad files?
From the tachin-r/Pyranometer_Over_engineering repository on GitHub, at the commit this page was made from: the board is L1_Analog_BPW34/L1_Analog_BPW34.kicad_pcb and its schematic L1_Analog/L1_Analog.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the L1 Analog BPW34 design in my own project?
Its repository states no licence, so its author keeps all rights: ask tachin-r before reusing the design.