4 layers101.3 × 50.5 mm
ESP32 sensor board
Ankithkumarsingh/ESP32-custom-sensor-board
This PCB contains the power supply unit, ESP32 module as compute, microphone sensor, light sensing sensor, SDCard module for data logging.
94 parts1
2 layers86.8 × 45.5 mm
Sensor board
Nyaigoti/sensor-boardThis project involves the design and development of a custom PCB for an IoT application powered by the ESP32-C3-02 SoC.
- Size
- 86.8 × 45.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 86
- Nets
- 67
- Pads
- 327
- Tracks, vias
- 525, 74
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Jul 2026
- Updated
- 23 Jul 2026
Overview
Sensor board is an open-source printed circuit board by Nyaigoti, from the Nyaigoti/sensor-board repository on GitHub. It is a 2-layer board of 86.8 × 45.5 mm with 86 parts on 67 nets, routed with 525 tracks and 74 vias.
It is built around the ESP32-C3-WROOM-02-H4, MCP73871EV and BME280, with the CP2102N-A02-GQFN20, MAX4466EXK+T and W25Q32JVSSIQ among its other parts. Its parts include 31 resistors, 25 capacitors, 8 ICs, 6 diodes and 4 connectors. It belongs with the power and sensors and measurement boards and the ESP32 and RISC-V boards of this library.
Main components
12
ESP32-C3-WROOM-02-H4
SMD,20x18mm-105dBm -40℃~+105℃ 2.4GHz 20.5dBm 345mA 3V~3.6V 82mA Bluetooth5.0 ESP32-C3 On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,20x18mm WiFi Modules ROHSEspressif SystemsWiFi ModulesMCP73871EV
-ModulesMicrochip Technology
BME280
LGA-8(2.5x2.5)-40℃~+85℃ 0%RH~100%RH 1.71V~3.6V 1.8uA 16bit I2C、SPI ±0.5℃ ±3%RH LGA-8(2.5x2.5) Temperature and Humidity Sensor ROHSBoschTemperature And Humidity Sensor
CP2102N-A02-GQFN20
QFN-20-EP(3x3)-40℃~+85℃ 195uA 3Mbps 3V~3.6V 9.5mA USB 2.0 USB to UART QFN-20-EP(3x3) USB Converters ROHSSilicon LabsUSB Converters
MAX4466EXK+T
SC-70-5-40℃~+85℃ 0.03% 1-Channel 112dB 2.4V~5.5V 24A SC-70-5 Audio Amplifiers ROHSMaxim Integrated (Analog Devices)Audio Amplifiers
W25Q32JVSSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 133MHz 1uA 2.7V~3.6V 20 Years 32Mbit 3ms SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASHGSD090012SEU
-2.95mm Connector and Ejector MicroSD Card (TF Card) Push-Pull With Locating Pins Yes - SD Card / Memory Card Connector ROHSAmphenolSD Card / Memory Card Connector
TEMT6000X01
1206-40℃~+100℃ 1.05mm 2mm 3nA 4mm Light Intensity 1206 Ambient Light Sensors ROHSVishay IntertechnologyAmbient Light Sensors
LM1117DT-3.3
TO-2520℃~+125℃@(Tj) 1 1.2V@(800mA) 15V 3.3V 5mA 75dB@(120Hz) 800mA Fixed Over Current Protection、Over Temperature Protection、Short Circuit Protection Positive TO-252 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
BC817
SOT-231 NPN 100nA 150MHz 300mW 40 45V 500mA 5V 700mV NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)
35WR100KLFTR
SMD-3P,3.7x3mm1 100kΩ 100mW ±25% ±250ppm/℃ SMD-3P,3.7x3mm Potentiometers, Variable Resistors ROHSTT ElectronicsPotentiometers & Variable Resistors
README
README.mdCustom IoT PCB with ESP32-C3-02 and TP4056 Li-ion Charger
This project involves the design and development of a custom PCB for an IoT application powered by the ESP32-C3-02 SoC. The board includes integrated power management features using the TP4056 Li-ion battery charger IC, enabling efficient and safe charging of a single-cell Li-ion battery.
Key Features
- Microcontroller: ESP32-C3-02 SoC for Wi-Fi and BLE connectivity.
- Power Management: TP4056 IC for single-cell Li-ion battery charging with thermal regulation.
- Battery Protection: Integrated under-voltage lockout and trickle charging.
- Sensors and Modules:
- BME280 for temperature, humidity, and pressure sensing.
- Ambient light and sound sensors.
- Mini SD card reader for data storage.
- Flash memory for additional storage.
- Display: I2C OLED for real-time data visualization.
- Power Inputs:
- USB-C connector for charging and data transfer.
- LiPo battery connector with onboard charging circuitry.
- Indicators: LED indicators for charge status (charging and full).
Design Highlights
-
Power Supply Integration:
- USB-C provides power for both charging and system operation.
- TP4056 handles battery charging and protection.
- Power supplied to the ESP32-C3-02 is regulated for stability.
-
Modular Architecture:
- Supports various sensors and peripherals for IoT applications.
- Expandable via additional I2C devices.
-
Safe and Efficient Charging:
- Programmable charging current using an external resistor.
- Automatic charge termination and battery protection.
-
Compact and Reliable Layout:
- Optimized PCB traces for minimal power loss.
- Thermal management for the TP4056 and other components.
Parts
86| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 0.1u | Capacitor_SMD:C_0805_2012Metric | C1, C2, C3, C5, C8, C9, C11, C12, C14, C15, C16, C19, C23, C25, C26 |
| 5 | 10k | Resistor_SMD:R_0805_2012Metric | R2, R3, R19, R30, R31 |
| 5 | 10u | Capacitor_SMD:C_0805_2012Metric | C4, C6, C7, C13, C20 |
| 4 | 50 | Resistor_SMD:R_0805_2012Metric | R15, R16, R17, R18 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2_DIN965_Pad_TopBottom | H1, H2, H3, H4 |
| 3 | 10n | Capacitor_SMD:C_0805_2012Metric | C17, C18, C22 |
| 3 | 330 | Resistor_SMD:R_0805_2012Metric | R9, R13, R14 |
| 3 | 470 | Resistor_SMD:R_0805_2012Metric | R6, R7, R8 |
| 3 | 4k7 | Resistor_SMD:R_0805_2012Metric | R20, R21, R22 |
| 3 | Red | LED_SMD:LED_1206_3216Metric | D1, D4, D6 |
| 2 | 1M | Resistor_SMD:R_0805_2012Metric | R26, R27 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric | R10, R23 |
| 2 | 2K | Resistor_SMD:R_0805_2012Metric | R28, R29 |
| 2 | BC817 | Package_TO_SOT_SMD:SOT-23 | Q2, Q3 |
| 2 | Green | LED_SMD:LED_1206_3216Metric | D2, D5 |
| 2 | SW_MEC_5E | USLPT2819DT2TR:SW_USLPT2819DT2TR | SW3, SW4 |
| 1 | 100p | Capacitor_SMD:C_0805_2012Metric | C21 |
| 1 | 20k | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | 22k | Resistor_SMD:R_0805_2012Metric | R24 |
| 1 | 22k1 | Resistor_SMD:R_0805_2012Metric | R11 |
| 1 | 2k | Resistor_SMD:R_0805_2012Metric | R4 |
| 1 | 35WR100KLFTR | 35WR100KLFTR:TRIM_35WR100KLFTR | R25 |
| 1 | 4.7u | Capacitor_SMD:C_0805_2012Metric | C10 |
| 1 | 47k5 | Resistor_SMD:R_0805_2012Metric | R12 |
| 1 | 5k1 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | BME280 | Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering | U7 |
| 1 | Blue | LED_SMD:LED_1206_3216Metric | D3 |
| 1 | CMC-5042PF-AC | CMC-5042PF-AC:CUI_CMC-5042PF-AC | MK1 |
| 1 | CP2102N-A02-GQFN20 | CP2102N-A02-GQFN20:WFQFN-20 | U4 |
| 1 | Conn_01x02_Pin | Connector_JST:JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | J1 |
| 1 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical_SMD_Pin1Left | J3 |
| 1 | ESP32-C3-WROOM-02 | RF_Module:ESP32-C3-WROOM-02 | U3 |
| 1 | FBMJ2125HM330-T | FBMJ2125HM330-T:BEADC2012X105N | FB1 |
| 1 | Fuse | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | GSD090012SEU | GSD090012SEU:AMPHENOL_GSD090012SEU | J2 |
| 1 | LM1117DT-3.3 | Package_TO_SOT_SMD:TO-252-3_TabPin2 | U2 |
| 1 | MAX4466EXK | MAX4466EXK:SOT65P210X110-5N | U8 |
| 1 | MCP73871 | Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm | U1 |
| 1 | TEMT6000X01 | TEMT6000X01:TRANS_TEMT6000X01 | Q1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U5 |
| 1 | USB_C_Plug_USB2.0 | Connector_USB:USB_C_Receptacle_Amphenol_124019772112A | P1 |
| 1 | W25Q32JVSSIQ | W25Q32JVSSIQ:SOIC127P790X216-8N | U6 |
Questions
How big is the Sensor board PCB?
It measures 86.8 × 45.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sensor board use?
86 parts, built around the ESP32-C3-WROOM-02-H4, MCP73871EV, BME280 and CP2102N-A02-GQFN20. 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 Sensor board KiCad files?
From the Nyaigoti/sensor-board repository on GitHub, at the commit this page was made from: the board is sensor-board.kicad_pcb and its schematic mcu.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sensor board design in my own project?
Its repository states no licence, so its author keeps all rights: ask Nyaigoti before reusing the design.
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