4 layers102.4 × 83.1 mm
2 layers94 × 99 mm
Inductance Meter V2-0
RobieElliz/esp32InductanceMeterV220Portable ESP32 Inductance Meter: A low-cost, high-precision tool with dual 100nF/5µF refs, a TLV3202 comparator, fast USB-C (IP2312) charging, and a 2.4-inch OLED display for real-time readings.
- Size
- 94 × 99 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 86
- Nets
- 79
- Pads
- 297
- Tracks, vias
- 447, 111
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 11 Feb 2025
- Updated
- 11 Feb 2025
Overview
Inductance Meter V2-0 is an open-source printed circuit board by RobieElliz, from the RobieElliz/esp32InductanceMeterV2 repository on GitHub, published under the MIT licence. It is a 2-layer board of 94 × 99 mm with 86 parts on 79 nets, routed with 447 tracks and 111 vias.
It is built around the ESP32-WROOM-32U, DW01A and IP2312U, with the TLV3202AIDR(LX), FS8205A and G5V-1-DC3 among its other parts. Its parts include 28 resistors, 17 capacitors, 8 ICs, 6 diodes and 4 connectors. It belongs with the lEDs and displays boards and the ESP32 boards of this library.
Main components
7
ESP32-WROOM-32U
SMD,19.2x18mm-40℃~+85℃ -97dBm 2.4GHz 20.5dBm 3V~3.6V Bluetooth4.2 ESP32-DOWD UART、SDIO、SPI、I2C、GPIO、PWM、ADC、DAC、CAN SMD,19.2x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
DW01A
SOT-23-6L-40℃~+85℃ 1 2.5V 300mV~10V 3uA 4.3V Protection IC Support SOT-23-6L Battery Management ROHSPUOLOPBattery Management
IP2312U
SOP-8L-40℃~+150℃ 1 3A 4.2V 4.5V~5.5V 50uA Charging IC Lithium Battery Support SOP-8L Battery Management ROHSINJOINICBattery Management
TLV3202AIDR(LX)
SOP-8SOP-8 Comparators ROHSlingxingicComparatorsFS8205A
SOT-23-6-55℃~+150℃ 1.2V 1.5W 2 N-Channel 20V 31.5mΩ@2.5V 466pF 5.7nC@4.5V 58pF 65pF 6A SOT-23-6 MOSFETs ROHSTECH PUBLICMOSFETs
G5V-1-DC3
Ultra-miniature, Highly Sensitive SPDT Relay for Signal CircuitsOmronUncategorised
SS8050
SOT-323-55℃~+150℃ 1 NPN 1.5A 100MHz 100nA 200 25V 300mW 500mV 5V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
README
README.md
Portable ESP32 Inductance Meter
A DIY ESP32-based inductance meter designed to bridge the gap in electronics testing. Developed at the Polytechnic University of the Philippines, this low-cost, high-precision tool is ideal for students, researchers, and hobbyists.
🔧 Bridging the Gap in Electronics Testing
Accurate inductance measurement is crucial in electronics. Yet, professional meters are often expensive and inaccessible. This project provides an affordable alternative for educational and experimental applications.
🚀 What It Does
Using LC resonance principles, the device:
- Excites inductors and detects oscillations
- Calculates inductance with high accuracy
- Measures various types of inductors:
- Toroidal
- Power
- Surface-mount (SMD)
- Air-core
- Employs dual reference capacitors (100nF & 5µF) for precise mH and µH readings
🛠 Key Features & Innovations
- ESP32-powered processing for real-time calculations
- Dual reference capacitors to optimize accuracy
- Capacitive touch controls for seamless operation
- Rechargeable 18650 battery for true portability
- OLED display for clear, instant readings
- Multiple measurement modes: Single or continuous testing
📌 Why It Matters
By democratizing access to essential testing equipment, this project empowers the next generation of engineers to innovate and experiment without breaking the bank.
Detailed Components
🔧 Dual Reference Capacitors (100nF & 5µF)
- 100nF: For higher inductance (mH range) with enhanced accuracy
- 5µF: Ideal for lower inductance (µH range) ensuring frequency stability
🟢 TLV3202 Comparator
- Ultra-high-speed and low-power
- Ensures precise detection of LC oscillations
⚡ IP2312 Battery Management IC
- Supports USB Type-C charging (5V, up to 3A)
- Provides overvoltage, undervoltage, and overcurrent protection
- Delivers a stable 3.3V output with buck-boost regulation
📟 2.4-inch OLED Display
- Connected via I²C for reduced wiring complexity
- Stacked on the PCB using screws for a compact design
- Displays real-time inductance, frequency, and battery status
Additional Resources
- OLED Module Purchase:
Shopee: 2.4" 2.42 inch 128x64 OLED LCD Display Module SSD1309
License
This project is open source. See the LICENSE file for more details.
Made By
This project is made by:
Johanna Abareta, Ken Louise Aycardo, Katrina Dianne Fernandez, Vince Morales, Robie Elliz Tizon
Parts
86| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R19, R23, R27, R28 |
| 5 | 22uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C11, C12, C13, C16 |
| 4 | 100R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R16, R17, R24 |
| 4 | M3 Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 4 | Solderable Tie | easyeda2kicad:Net-Tie 0805 Based | T1, T2, T3, T4 |
| 3 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C17 |
| 3 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2, D3, D6 |
| 3 | Touch | Robie_Customs:Touch_Pad_ESP | J2, J3, J4 |
| 2 | 100K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6 |
| 2 | 150R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R20, R26 |
| 2 | 1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9, R18 |
| 2 | 1N4007 A7 | easyeda2kicad:SOD-123FL_L2.8-W1.8-LS3.7-RD | D4, D5 |
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C14, C15 |
| 2 | 47K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12, R13 |
| 2 | 5.1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8, R10 |
| 2 | LOGO | images:Inductance Meter Logo | G***, G*** |
| 1 | 0.5R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R14 |
| 1 | 100n | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 100nF MKP | easyeda2kicad:CAP-TH_L26.0-W8.0-P22.50-D0.8 | U5 |
| 1 | 100nF MLCC | easyeda2kicad:CAP-TH_L5.5-W3.2-P5.00-D0.5 | C7 |
| 1 | 18650 | easyeda2kicad:BATTERY-SMD_18650-1S-L77.1-W20.7-1 | BT1 |
| 1 | 1M | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R11 |
| 1 | 1uF CBB | easyeda2kicad:CAP-TH_L26.0-W11.1-P22.50-D1.4 | C9 |
| 1 | 1uH | Inductor_SMD:L_1008_2520Metric | L1 |
| 1 | 2.2nF | Capacitor_SMD:C_0805_2012Metric | C10 |
| 1 | 2.2uH | easyeda2kicad:IND-SMD_L7.1-W6.6 | L2 |
| 1 | 33R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R25 |
| 1 | 4.7uF MLCC | easyeda2kicad:CAP-TH_L5.5-W3.2-P5.00-D0.5 | C8 |
| 1 | 40K | Resistor_SMD:R_0805_2012Metric | R21 |
| 1 | 47uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 1 | 50K | Resistor_SMD:R_0805_2012Metric | R22 |
| 1 | 511K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 51K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R15 |
| 1 | 5uF MKP | easyeda2kicad:CAP-TH_L32.0-W16.0-P27.50-D0.8 | C6 |
| 1 | 91K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | BAT54-7-F | easyeda2kicad:SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | D1 |
| 1 | BNC | easyeda2kicad:BNC-TH_DOSIN-801-0051 | RF1 |
| 1 | BOOT | easyeda2kicad:SW-SMD_L3.9-W3.0-P4.45 | SW1 |
| 1 | DW01A | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | ENABLE | easyeda2kicad:SW-SMD_L3.9-W3.0-P4.45 | SW2 |
| 1 | ESP32-WROOM-32U | RF_Module:ESP32-WROOM-32U | U1 |
| 1 | FS8205A | easyeda2kicad:SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR | Q1 |
| 1 | G5V-1-DC3 | easyeda2kicad:RELAY-TH_G5V-1 | K1 |
| 1 | IP2312 | easyeda2kicad:SOP-8_L4.9-W3.9-P1.27-LS6.0-BL-EP | U6 |
| 1 | LOGO | images:arrow | G*** |
| 1 | ON-OFF | easyeda2kicad:SW-SMD_L3.9-W3.0-P4.45 | SW3 |
| 1 | S Term | easyeda2kicad:CONN-TH_2P-P2.54_MX128-2.54-GN01-02P-CU-Y-A | J1 |
| 1 | SMD L | easyeda2kicad:IND-SMD_L7.1-W6.6 | L3 |
| 1 | SS8050 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | TLV3202AIDR | easyeda2kicad:SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL | U4 |
| 1 | TPS631000DRLR | easyeda2kicad:SOT-583-8_L2.1-W1.2-P0.50-LS1.6-BL | U2 |
| 1 | TYPE-C 6P(073) | easyeda2kicad:TYPE-C-SMD_TYPE-C-6P_5 | USB1 |
| 1 | XH UART | easyeda2kicad:CONN-SMD_S6B-XH-SM4-TB-LF-SN | U7 |
| 1 | ~ | easyeda2kicad:2.4 OLED I2C | U8 |
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Questions
How big is the Inductance Meter V2-0 PCB?
It measures 94 × 99 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Inductance Meter V2-0 use?
86 parts, built around the ESP32-WROOM-32U, DW01A, IP2312U and TLV3202AIDR(LX). 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 Inductance Meter V2-0 KiCad files?
From the RobieElliz/esp32InductanceMeterV2 repository on GitHub, at the commit this page was made from: the board is Inductance Meter V2-0 - KiCAD/Inductance Meter V2-0.kicad_pcb and its schematic Inductance Meter V2-0 - KiCAD/Inductance Meter V2-0.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Inductance Meter V2-0 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).