Psu ext hardware
About the Psu ext hardware PCB
Psu ext hardware is an open source ESP32 PCB design by PSU-Ext-Org, published on GitHub under the CERN-OHL-S-2.0 license. It is a 4-layer board measuring 100 × 50 mm, with 110 components from 51 distinct parts.
Its main chip is the ESP32-S3-WROOM-1-N16R8, from the ESP32 family. Other key parts include the USBLC6-2SC6, AP22818BKCWT-7, LD1117S33TR, ISO1540DR and ADS1115IDGST. By type, the board carries 43 resistors, 35 capacitors, 12 diodes, 11 ICs, 3 connectors and 2 switches.
It belongs with the test & measurement designs in this gallery.
From the project
A repository to store PSU-EXT hardware design assets, schematics, circuit diagrams, CAD files and manufacturing data.
PSU-EXT sits between a bench power supply and a load or device under test. It measures output voltage and current, controls the output path with a relay, and makes the setup easier to monitor and automate.
- Live voltage, current, and power telemetry - Relay-controlled output enable/disable - Galvanically isolated control and measurement domains - SCPI control over USB CDC and TCP through the companion firmware and software - External trigger inputs, timer support, and configurable OVP/OCP behaviour
Main components on the Psu ext hardware
Psu ext hardware bill of materials (BOM)
110 components, 51 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | USBLC6-2SC6 | SOT-23-6 | U1 |
| 1 | AP22818BKCWT-7 AP22818AKEWT | SOT-23-5 | U2 |
| 2 | LD1117S33TR LD1117S33 | SOT-223-3_TabPin2 | U3, U4 |
| 1 | ESP32-S3-WROOM-1-N16R8 ESP32-S3-WROOM-1 | ESP32-S3-WROOM-1 | U5 |
| 1 | ISO1540DR ISO1540 | SOIC-8_3.9x4.9mm_P1.27mm | U7 |
| 1 | ADS1115IDGST ADS1115IDGS | TSSOP-10_3x3mm_P0.5mm | U8 |
| 1 | LMV321LILT LM321 | SOT-23-5 | U9 |
| 1 | INA240A2DR INA240A2D | SOIC-8_3.9x4.9mm_P1.27mm | U10 |
| 1 | TSZ122IYDT | SOIC-8_3.9x4.9mm_P1.27mm | U11 |
| 1 | LM2664M6X/NOPB LM2664M6 | SOT-23-6 | U12 |
| 1 | MMBT2222A | SOT-23 | Q1 |
| 1 | FC-135_32.7680KA-A0 | XTAL_FC-135_32.7680KA-A0 | Y1 |
| 1 | TYPE-C-31-M-12 | HRO_TYPE-C-31-M-12 | J1 |
| 1 | Conn_02x03_Odd_Even | PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | HF49FD/005-1H12T HF49FD_005-1H12T | RELAY_HF49FD_005-1H12T | K1 |
| 1 | RFM-0505S | CONV_RFM-0505S | PS1 |
| 2 | TS-1088-AR02016 SW_Push | SW_SPST_TS-1088-xR025 | SW1, SW2 |
| 3 | NCD0805R1 LED | LED_0805_2012Metric | D1, D2, D14 |
| 1 | KT-0805G LED | LED_0805_2012Metric | D3 |
Show 31 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | KT-0805W LED | LED_0805_2012Metric | D4 |
| 4 | ESD5Z3.3T1G ESD5Zxx | D_SOD-523 | D5, D6, D7, D8 |
| 1 | ESD5Zxx | D_SOD-523 | D9 |
| 1 | SMBJ36A | D_SMB | D13 |
| 1 | LL4148-GS08 LL4148 | D_MiniMELF | D15 |
| 2 | CL21B105KBFNNNE 1uF | C_0805_2012Metric | C1, C16 |
| 15 | CC0805KRX7R9BB104 100nF | C_0805_2012Metric | C2, C4, C10, C13, C15, C20, C22, C23 +7 |
| 2 | 189RV0006 47uF | CP_Elec_5x5.9 | C3, C9 |
| 2 | CL31A106KBHNNNE 10uF | C_1206_3216Metric | C5, C11 |
| 3 | CL21A106KAYNNNE 10uF | C_0805_2012Metric | C6, C12, C36 |
| 2 | TCC1206COG331J102DT 330p 1kV | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C7, C8 |
| 2 | CC0805JRNPO9BN120 12pF | C_0805_2012Metric | C14, C18 |
| 1 | CL21B102KBCNNNC 1nF | C_0805_2012Metric | C21 |
| 1 | CL21B224KBFNNNE 220nF | C_0805_2012Metric | C29 |
| 2 | CL21B103KBANNNC 10nF | C_0805_2012Metric | C30, C31 |
| 3 | CL21A226MAQNNNE 22uF | C_0805_2012Metric | C35, C37, C38 |
| 2 | 0805W8F5101T5E 5.1k | R_0805_2012Metric | R1, R2 |
| 7 | 0805W8F1001T5E 1k | R_0805_2012Metric | R3, R4, R8, R9, R32, R44, R45 |
| 5 | 0805W8F1002T5E 10k | R_0805_2012Metric | R5, R10, R11, R18, R28 |
| 6 | 0805W8F4701T5E 4.7k | R_0805_2012Metric | R6, R7, R12, R13, R26, R27 |
| 6 | 0805W8F220JT5E 22R | R_0805_2012Metric | R14, R15, R16, R17, R21, R22 |
| 2 | 0805W8F470KT5E 4.7R | R_0805_2012Metric | R23, R24 |
| 1 | 25121WF100MT4E 10mR | R_2512_6332Metric_Pad1.40x3.35mm_HandSolder | R25 |
| 1 | 0805W8F470JT5E 0R | R_0805_2012Metric | R29 |
| 1 | 0805W8F2202T5E 22k | R_0805_2012Metric | R30 |
| 1 | 0805W8J0202T5E 2k | R_0805_2012Metric | R31 |
| 1 | 0805W8F3300T5E 330R | R_0805_2012Metric | R33 |
| 1 | 0805W8F1501T5E 1.5k | R_0805_2012Metric | R34 |
| 1 | 0805W8F100JT5E 10R | R_0805_2012Metric | R35 |
| 4 | 160k | R_0805_2012Metric | R36, R37, R38, R39 |
| 4 | 0805W8F2002T5E 20k | R_0805_2012Metric | R40, R41, R42, R43 |
Psu ext hardware design files
The KiCad project lives in the PSU-Ext-Org/psu-ext-hardware repository on GitHub; these links point at the commit this page was built from.
Psu ext hardware: common questions
What microcontroller does the Psu ext hardware use?
The Psu ext hardware is built around the ESP32-S3-WROOM-1-N16R8, from the ESP32 family.
How big is the Psu ext hardware PCB?
The Psu ext hardware measures 100 × 50 mm, has 4 copper layers and is 1.6062 mm thick.
How many components are on the Psu ext hardware?
110 components, from 51 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 Psu ext hardware design files?
From the PSU-Ext-Org/psu-ext-hardware 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 Psu ext hardware design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which PSU-Ext-Org chose for the repository.
Can I test firmware for the Psu ext hardware without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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