Precision-Digital-Micro-Current-Meter
About the Precision-Digital-Micro-Current-Meter PCB
Precision-Digital-Micro-Current-Meter is an open source STM32 PCB design by jobitjoseph, published on GitHub. It is a 2-layer board measuring 45.2 × 65 mm, with 58 components from 39 distinct parts.
Its main chip is the STM32G071KBUX, from the STM32 family. Other key parts include the LTC4054ES5-4.2-TRMPBF, ADPL44002AUJZ2.5-R7, OLED, LMV321SN3T1G and MAX4239AUT+T. By type, the board carries 22 resistors, 11 capacitors, 9 ICs, 6 connectors, 3 switches and 3 diodes.
It belongs with the displays & leds designs in this gallery.
From the project
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 measuremen
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…
Main components on the Precision-Digital-Micro-Current-Meter
Precision-Digital-Micro-Current-Meter bill of materials (BOM)
58 components, 39 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LTC4054ES5-4.2-TRMPBF | S_5_ADI | U1 |
| 1 | ADPL44002AUJZ2.5-R7 ADPL44002AUJZ | SOT95P280X100-5N | U2 |
| 1 | STM32G071KBUX STM32G071KBUx | QFN-32-1EP_5x5mm_P0.5mm_EP3.45x3.45mm | U3 |
| 1 | OLED | MODULE_DM-OLED096-636 | U4 |
| 1 | LMV321SN3T1G | SOT95P275X110-5N | U5 |
| 2 | MAX4239AUT+T | SOT95P280X145-6N | U6, U7 |
| 1 | REF3012AIDBZR | DBZ3 | U8 |
| 1 | INA333AIDGKR | SOP65P490X110-8N | U9 |
| 1 | AO3401A | SOT-23 | Q1 |
| 1 | AO3400A | SOT-23 | Q2 |
| 1 | USB_C_RECEPTACLE_USB2.0_16P USB_C_Receptacle_USB2.0_16P | USB_C_Receptacle_Palconn_UTC16-G | J1 |
| 1 | B2B-PH-SM4-TB(LF)(SN) JST Sales America Inc. | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J2 |
| 1 | CONN_01X02 Conn_01x02 | JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | J3 |
| 1 | CONN_01X03 Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | CONN_01X04 Conn_01x04 | PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | CONN_01X02 Conn_01x02 | Banana_Jack_2Pin | J6 |
| 2 | SOLDERJUMPER_2_OPEN SolderJumper_2_Open | SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP2 |
| 1 | L203011MS02Q | L203111MS02Q | S1 |
| 1 | SW_Push | SW_PUSH_6mm | SW1 |
| 1 | RST | Tactile 3x4x2mm TS-A010 | SW2 |
Show 19 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LED_Small | LED_0603_1608Metric | D1 |
| 2 | 1N4148W | D_SOD-123 | D2, D3 |
| 2 | 4.7UF 4.7uF | C_0603_1608Metric | C1, C2 |
| 2 | 2.2UF 2.2uF | C_0603_1608Metric | C3, C4 |
| 1 | 0.1UF 0.1uF | C_0603_1608Metric | C7 |
| 4 | 100NF 100nF | C_0603_1608Metric | C8, C9, C12, C13 |
| 2 | 10PF 10pF | C_0603_1608Metric | C10, C11 |
| 2 | 5.1K | R_0603_1608Metric | R1, R2 |
| 1 | 470R | R_0603_1608Metric | R3 |
| 1 | 2K | R_0603_1608Metric | R4 |
| 4 | 100K | R_0603_1608Metric | R5, R6, R7, R8 |
| 1 | 10K 0.05% | R_0805_2012Metric | R9 |
| 1 | 0.01R 0.05% | R_2512_6332Metric | R10 |
| 2 | 100K 1% | R_0603_1608Metric | R11, R12 |
| 1 | 10R 0.05% | R_0805_2012Metric | R13 |
| 3 | 270R | R_0603_1608Metric | R14, R15, R22 |
| 2 | 1K 0.05% | R_0603_1608Metric | R16, R19 |
| 2 | 6.8K 0.05% | R_0603_1608Metric | R17, R20 |
| 2 | 2.2K 0.05% | R_0603_1608Metric | R18, R21 |
Precision-Digital-Micro-Current-Meter design files
The KiCad project lives in the jobitjoseph/Precision-Digital-Micro-Current-Meter repository on GitHub; these links point at the commit this page was built from.
Precision-Digital-Micro-Current-Meter: common questions
What microcontroller does the Precision-Digital-Micro-Current-Meter use?
The Precision-Digital-Micro-Current-Meter is built around the STM32G071KBUX, from the STM32 family.
How big is the Precision-Digital-Micro-Current-Meter PCB?
The Precision-Digital-Micro-Current-Meter measures 45.2 × 65 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Precision-Digital-Micro-Current-Meter?
58 components, from 39 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Precision-Digital-Micro-Current-Meter design files?
From the jobitjoseph/Precision-Digital-Micro-Current-Meter repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Precision-Digital-Micro-Current-Meter design in my own project?
The repository has no license, so all rights stay with jobitjoseph. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Precision-Digital-Micro-Current-Meter without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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