2 layers68.3 × 47.1 mm
USB C Power Supply
lalithk06/PCB_Designs
This repository contains various PCB design projects made using KiCad
61 parts
4 layers72.9 × 62.9 mm
IEQ Monitor
lalithk06/PCB_DesignsThis repository contains various PCB design projects made using KiCad
- Size
- 72.9 × 62.9 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 88
- Nets
- 80
- Pads
- 379
- Tracks, vias
- 620, 193
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 22 Jul 2025
- Updated
- 16 Jun 2026
Overview
IEQ Monitor is an open-source printed circuit board by lalithk06, from the lalithk06/PCB_Designs repository on GitHub. It is a 4-layer board of 72.9 × 62.9 mm with 88 parts on 80 nets, routed with 620 tracks and 193 vias.
It is built around the ESP32-S3-WROOM-1-N8, BME280 and ENS160-BGLM, with the MLX90614ESF-BAA-000-TU, MP1584EN-LF-Z and OPT3001IDNPRQ1 among its other parts. Its parts include 26 capacitors, 17 resistors, 11 ICs, 8 diodes and 5 connectors. It belongs with the ESP32 boards of this library.
Main components
12
ESP32-S3-WROOM-1-N8
SMD,25.5x18mm-40℃~+85℃ -98.2dBm 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3 Chip On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
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
ENS160-BGLM
LGA-9(3x3)-40℃~+85℃ 0.9mm 1.71V~1.98V 29mA 3mm 3mm Carbon dioxide、Air quality、Metal Oxide SPI;I2C LGA-9(3x3) Gas Sensors ROHSSciosenseGas Sensors
MLX90614ESF-BAA-000-TU
TO-39-4-40℃~+85℃ 10bit 2.6V~3.6V 6uA SMBus ±0.5℃ TO-39-4 Temperature Sensors ROHSMelexisTemperature SensorsMP1584EN-LF-Z
SOIC-8-EP-20℃~+85℃@(TA) 1 100kHz~1.5MHz 100uA 3A 4.5V~28V 800mV~25V Adjustable Buck Buck Built-in No SOIC-8-EP DC-DC Converters ROHSMonolithic Power SystemsDC-DC Converters
OPT3001IDNPRQ1
WSON-6-EP(2x2)-40℃~+85℃ 0.65mm 1.6V~3.6V 2mm 2mm 83klx I2C Light Intensity WSON-6-EP(2x2) Ambient Light Sensors ROHSTexas InstrumentsAmbient Light Sensors
SCD40-D-R2
LGA-20(10.1x10.1)-10℃~+60℃ 10.1mm 10.1mm 15mA 2.4V~5.5V 400ppm~2000ppm 6.5mm Air quality I2C Reset function ±5% LGA-20(10.1x10.1) Gas Sensors ROHSSensirionGas Sensors
AP2112K-3.3
SOT253.3V 600mA CMOS Low Dropout Linear Regulator with EnableDiodes IncorporatedUncategorised
DS3231MZ+
SOIC-8-40℃~+85℃ 2.3V~5.5V I2C Temperature compensation、Backup power management and battery charging、Alarm function、Periodic interrupt output SOIC-8 Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real Time Clocks
USBLC6-2P6
SOT-666-6-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A@8/20us 6V ESD IEC 61000-4-2 Unidirectional SOT-666-6 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)CH291-1220LF
SMDSMD New Arrivals ROHSMulticompUncategorised
MBR0520
SOD-123-55℃~+150℃ 20V 450mV@500mA 5.5A 500mA Independent SOD-123 Schottky Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Schottky Diodes
README
Fire_Alarm/README.md🔥 Fire Alarm System — PCB Project (As part of my Semester-II curriculum)
A simple and low-cost fire alarm system based on LDR (Light Dependent Resistor) and BJT. This project includes the schematic and PCB layout designed in KiCad.
⚙ Working Principle
- The system uses an LDR (Light Dependent Resistor) to detect changes in light intensity.
- In the event of a fire, the light from flames increases the light falling on the LDR, reducing its resistance.
- This change triggers a BJT (Bipolar Junction Transistor) to conduct, activating the buzzer and LED to alert nearby individuals.
📌 Objective
To design, simulate, and layout a compact fire detection circuit that responds to light intensity variations, suitable for fire-prone zones or domestic safety applications.
⚙ Components Used
| No. | Components | Specifications |
|---|---|---|
| 1. | Battery | 9V |
| 2. | Transistor (NPN BJT) | BC547 |
| 3. | LDR | Standard |
| 4. | Resistors | |
| 5. | LED | Red (2V forward drop) |
| 6. | Buzzer | 5V-9V piezo or magnetic |
📷 Preview
🖼 Schematic Circuit Diagram
📐 PCB Layout
🧊 3-D Front View
🔄 Future Improvements
- Add temperature, smoke and IR sensors
- Microcontroller integration (e.g. ATmega328 or ESP32)
- IoT capability for remote alerts (e.g., SMS / Blynk app)
- Adjustable Sensitivity
Parts
88| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C6, C9, C11, C15, C16, C17, C20, C21, C25 |
| 6 | 1K | Resistor_SMD:R_0603_1608Metric | R_LED1, R_LED2, R_LED3, R_LED4, R_LED5, R_PRG1 |
| 5 | 10uF | Capacitor_SMD:C_0805_2012Metric | C4, C7, C10, C14, CIN1 |
| 5 | RED_LED | LED_SMD:LED_0201_0603Metric | D2, D6, D7, D8, D9 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_Pad_Via | H1, H2, H3, H4 |
| 3 | 100nF | Capacitor_SMD:C_0805_2012Metric | C12, C22, C23 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C18, C19, C24 |
| 3 | 33 | Resistor_SMD:R_0603_1608Metric | R15, R16, R17 |
| 3 | Fiducial | Fiducial:Fiducial_0.75mm_Mask1.5mm | FID1, FID2, FID3 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R11, R14 |
| 2 | 22 | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R12, R13 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R3, R4 |
| 2 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3, J4 |
| 2 | SW_Push | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SW1, SW2 |
| 1 | 0 | Resistor_SMD:R_0603_1608Metric | R18 |
| 1 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 10uF/50V | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 10uH | Inductor_SMD:L_6.3x6.3_H3 | L1 |
| 1 | 124k | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 200k | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 220pF | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 22uF/6.3V | Capacitor_SMD:C_0805_2012Metric | C13 |
| 1 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C8 |
| 1 | 40k | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 68.1k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | BME280 | Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering | U4 |
| 1 | CH291-1220LF | CH291-1220LF:BAT_CH291-1220LF | BT1 |
| 1 | Conn_01x02 | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J2 |
| 1 | D | Diode_SMD:D_SOD-123F | D4 |
| 1 | DS3231M | Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm | U7 |
| 1 | D_Schottky | Diode_SMD:D_SMA | D3 |
| 1 | ENS160-BGLM | ENS160-BGLM:XDCR_ENS160-BGLM | U8 |
| 1 | ESP32-S3-WROOM-1 | RF_Module:ESP32-S3-WROOM-1 | U5 |
| 1 | MBR0520 | Diode_SMD:D_SOD-123 | D1 |
| 1 | MCP73831-2-OT | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | MLX90614ESF-BAA-000-TU | MLX90614ESF-BAA-000-TU:TO254P942H425-4 | U10 |
| 1 | MP1584EN-LF-Z | MP1584EN-LF-Z:SOIC127P600X170-9N | IC1 |
| 1 | Micro_SD_Card | Connector_Card:microSD_HC_Hirose_DM3AT-SF-PEJM5 | J5 |
| 1 | NS | Capacitor_SMD:C_0805_2012Metric | C2 |
| 1 | OPT3001IDNPRQ1 | OPT3001IDNPRQ1:SON65P200X200X65-7N | U9 |
| 1 | SCD40-D-R2 | Sensor:Sensirion_SCD4x-1EP_10.1x10.1mm_P1.25mm_EP4.8x4.8mm | U6 |
| 1 | TP_3V3 | Test Point:TestPoint_Pad_D2.5mm | TP2 |
| 1 | TP_GND | Test Point:TestPoint_Pad_D2.5mm | TP1 |
| 1 | TP_RX | Test Point:TestPoint_Pad_D2.5mm | TP4 |
| 1 | TP_TX | Test Point:TestPoint_Pad_D2.5mm | TP3 |
| 1 | USBLC6-2P6 | Package_TO_SOT_SMD:SOT-666 | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HCTL_HC-TYPE-C-16P-01A | J1 |
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Questions
How big is the IEQ Monitor PCB?
It measures 72.9 × 62.9 mm and has 4 copper layers, 1.6 mm thick.
What parts does the IEQ Monitor use?
88 parts, built around the ESP32-S3-WROOM-1-N8, BME280, ENS160-BGLM and MLX90614ESF-BAA-000-TU. 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 IEQ Monitor KiCad files?
From the lalithk06/PCB_Designs repository on GitHub, at the commit this page was made from: the board is ESP32_IEQ_Monitor/Hardware/IEQ_Monitor/IEQ_Monitor.kicad_pcb and its schematic ESP32_IEQ_Monitor/Hardware/IEQ_Monitor/IEQ_Monitor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the IEQ Monitor design in my own project?
Its repository states no licence, so its author keeps all rights: ask lalithk06 before reusing the design.