2 layers42.3 × 42.3 mm
Wireless Stepper Motor Controller
Circuit-Digest/Wireless-Stepper-Motor-Controller
The Wireless Stepper Driver is a compact and efficient motion control system designed to control stepper motors over Wi-Fi.
62 parts17MIT
2 layers45.2 × 65 mm
Precision Digital Micro Current Meter
jobitjoseph/Precision-Digital-Micro-Current-Meter7Keeping track of extremely low current levels is often essential when developing or testing low-power devices, especially in the field of embedded systems and battery-operated electronics.
- Size
- 45.2 × 65 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 67
- Nets
- 66
- Pads
- 219
- Tracks, vias
- 932, 79
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 May 2025
- Updated
- 26 May 2025
Overview
Precision Digital Micro Current Meter is an open-source printed circuit board by jobitjoseph, from the jobitjoseph/Precision-Digital-Micro-Current-Meter repository on GitHub. It is a 2-layer board of 45.2 × 65 mm with 67 parts on 66 nets, routed with 932 tracks and 79 vias.
It is built around the INA333AIDGKR, MAX4239AUT+T and ADPL44002AUJZ-R7, with the REF3012AIDBZR, 1N4148W and AO3400A among its other parts. Its parts include 22 resistors, 11 capacitors, 9 ICs, 6 connectors and 3 diodes. It belongs with the STM32 boards of this library.
Main components
9
INA333AIDGKR
MSOP-8-40℃~+125℃ 0.16V/us 1 1.8V~5.5V 100dB 100nV/℃ 200pA 200pA 25uV 5.5V 50nV/√Hz@1kHz 50uA Rail-to-Rail Output MSOP-8 Instrumentation Amplifiers ROHSTexas InstrumentsInstrumentation Amplifiers
MAX4239AUT+T
SOT-23-6-40℃~+125℃ 1.6V/us 10nV/℃ 140dB 1pA 2.7V~5.5V 2uA 2uV 30nV/√Hz@1kHz 40mA 6.5MHz 600uA Rail-to-rail output Zero drift / auto-zero、Enable/shutdown function、Decompensated stable SOT-23-6 Precision Op Amps ROHSMaxim Integrated (Analog Devices)Precision Op Amps
ADPL44002AUJZ-R7
TSOT-5TSOT-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAnalog DevicesUncategorised
REF3012AIDBZR
SOT-23-40℃~+125℃@(Ta) 1.25V 1.8V~5.5V 14uVp-p 25mA 42uVrms 50uA 75ppm/℃ Fixed Series ±0.2% SOT-23 Voltage Reference ROHSTexas InstrumentsVoltage Reference
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching DiodesAO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsAO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
B2B-PH-SM4-TB(LF)(SN)
SMD,P=2mm-25℃~+85℃ 1 100V 1x2P 2 2A 2P 2mm 6.6mm 7.95mm 7mm Auxiliary Solder Pin Beige Copper alloy PA PH Surface Mount,Vertical Tin UL94V-0 SMD,P=2mm Wire To Board Connector ROHSJSTWire To Board ConnectorL203011MS02Q
插件-30℃~+65℃ 28V DP3T PC Pin Rectangular Columnar Through Hole 插件 Slide Switches ROHSC&KSlide Switches
README
README.mdPrecision-Digital-Micro-Current-Meter
Keeping track of extremely low current levels is often essential when developing or testing low-power devices, especially in the field of embedded systems and battery-operated electronics. This project presents a compact and reliable micro current meter that makes such measurements straightforward and accessible. It is built around an STM32 microcontroller and features an OLED display for real-time readouts. The analog front end is designed to detect small current flows accurately, converting them into voltage levels that the microcontroller can process with high resolution. Whether you're measuring sleep current in a sensor node or characterising a power-efficient circuit, the device offers a clear and immediate view of power consumption trends.
The meter is designed for ease of use on the workbench, with a focus on readability, stability, and portability. The OLED display provides a crisp output that remains visible under most lighting conditions, while the microcontroller handles signal processing and automatic range detection. Calibration routines ensure measurement consistency across various load conditions. With no need for external tools or complex setups, the device offers a plug-and-play experience for engineers, developers, or hobbyists working with ultra-low power electronics. Its practical design makes it a useful tool for anyone seeking to analyse power usage with precision and simplicity.
Parts
67| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100K | Resistor_SMD:R_0603_1608Metric | R5, R6, R7, R8 |
| 4 | 100nF | Capacitor_SMD:C_0603_1608Metric | C8, C9, C12, C13 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.5mm_Pad | H1, H2, H3, H4 |
| 3 | 270R | Resistor_SMD:R_0603_1608Metric | R14, R15, R22 |
| 3 | LOGO | LOGO | G***, G***, G*** |
| 2 | 100K 1% | Resistor_SMD:R_0603_1608Metric | R11, R12 |
| 2 | 10pF | Capacitor_SMD:C_0603_1608Metric | C10, C11 |
| 2 | 1K 0.05% | Resistor_SMD:R_0603_1608Metric | R16, R19 |
| 2 | 1N4148W | Diode_SMD:D_SOD-123 | D2, D3 |
| 2 | 2.2K 0.05% | Resistor_SMD:R_0603_1608Metric | R18, R21 |
| 2 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C3, C4 |
| 2 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | 5.1K | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | 6.8K 0.05% | Resistor_SMD:R_0603_1608Metric | R17, R20 |
| 2 | JJ_LOGOV2 | Logos:JJ_LOGOV2 | G***, G*** |
| 2 | MAX4239AUT+T | MAX4239AUT+T:SOT95P280X145-6N | U6, U7 |
| 2 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP2 |
| 1 | 0.01R 0.05% | Resistor_SMD:R_2512_6332Metric | R10 |
| 1 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 10K 0.05% | Resistor_SMD:R_0805_2012Metric | R9 |
| 1 | 10R 0.05% | Resistor_SMD:R_0805_2012Metric | R13 |
| 1 | 2K | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 470R | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | ADPL44002AUJZ | ADPL44002AUJZ-3.3-R7:SOT95P280X100-5N | U2 |
| 1 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | B2B-PH-SM4-TB(LF)(SN) | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J2 |
| 1 | Conn_01x02 | BananaPlug:Banana_Jack_2Pin | J6 |
| 1 | Conn_01x02 | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J3 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | INA333AIDGKR | INA333AIDGKR:SOP65P490X110-8N | U9 |
| 1 | L203011MS02Q | L203011MS02Q:L203111MS02Q | S1 |
| 1 | LED_Small | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | LMV321SN3T1G | LMV321SN3T1G:SOT95P275X110-5N | U5 |
| 1 | LTC4054ES5-4.2-TRMPBF | LTC4054ES5_4_2_TRMPBF:S_5_ADI | U1 |
| 1 | OLED | OLED:MODULE_DM-OLED096-636 | U4 |
| 1 | REF3012AIDBZR | REF3012AIDBZR:DBZ3 | U8 |
| 1 | RST | 3x4x2:Tactile 3x4x2mm TS-A010 | SW2 |
| 1 | STM32G071KBUx | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.45x3.45mm | U3 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_Palconn_UTC16-G | J1 |
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Questions
How big is the Precision Digital Micro Current Meter PCB?
It measures 45.2 × 65 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Precision Digital Micro Current Meter use?
67 parts, built around the INA333AIDGKR, MAX4239AUT+T, ADPL44002AUJZ-R7 and REF3012AIDBZR. 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 Precision Digital Micro Current Meter KiCad files?
From the jobitjoseph/Precision-Digital-Micro-Current-Meter repository on GitHub, at the commit this page was made from: the board is PCB/Precision Digital Micro Current Meter/Precision Digital Micro Current Meter.kicad_pcb and its schematic PCB/Precision Digital Micro Current Meter/Precision Digital Micro Current Meter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Precision Digital Micro Current Meter design in my own project?
Its repository states no licence, so its author keeps all rights: ask jobitjoseph before reusing the design.