2 layers100 × 70 mm
Utf-9-samplified
wgd-modular/utf-9-samplified
A standalone drum machine based on the bleep drum.
27 parts19
2 layers52 × 48 mm
STM32-Based Programmable Waveform Generator
devjamescollier/STM-32_Based_Waveform_GeneratorUSB-powered programmable function generator built around an STM32C031K6T6 microcontroller and MCP4901 DAC. Generates clean sine, triangle, and square waveforms with amplitude control via potentiometer, mode selection…
- Size
- 52 × 48 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 48
- Nets
- 50
- Pads
- 155
- Tracks, vias
- 298, 40
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 2 Oct 2026
- Updated
- 2 Oct 2026
Overview
STM32-Based Programmable Waveform Generator is an open-source printed circuit board by devjamescollier, from the devjamescollier/STM-32_Based_Waveform_Generator repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 52 × 48 mm with 48 parts on 50 nets, routed with 298 tracks and 40 vias.
It is built around the MCP4901-E/P, TLV2372IP and LM1117IMP-3.3/NOPB-HXY, with the IRLML0030 among its other parts. Its parts include 14 resistors, 11 capacitors, 5 diodes, 4 ICs and 3 connectors. It belongs with the STM32 boards of this library.
Main components
4
MCP4901-E/P
PDIP-8-40℃~+125℃ 1 1LSB 2.7V~5.5V 4.5us 8 Power-on reset、Power-down mode、Programmable gain SPI PDIP-8 Digital to Analog Converters (DAC) ROHSMicrochip TechnologyDigital To Analog Converters (DAC)TLV2372IP
PDIP-8-40℃~+125℃ -8V~-1.35V、1.35V~8V 16mA 1pA 1pA 2 2.1V/us 2.7V~16V 2uV/℃ 35nV/√Hz@10kHz 3MHz 4.5mV 550uA 84dB Enable/shutdown function、Built-in compensation Rail-to-Rail Input, Rail-to-Rail Output PDIP-8 Operational Amplifier ROHSTexas InstrumentsOperational Amplifier
LM1117IMP-3.3/NOPB-HXY
SOT-223-20℃~+85℃ 1.3V@(800mA) 15V 2mA 3.3V 800mA Fixed Thermal Shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHXY MOSFETVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
IRLML0030
SOT-23-55℃~+150℃ 1 N-channel 2.3V 2.6nC 27mΩ@10V 30V 382pF 39pF 5.3A SOT-23 MOSFETs ROHSGuangdong HottechMOSFETs
README
README.mdSTM32-Based Programmable Waveform Generator
USB-powered programmable function generator built around an STM32C031K6T6 microcontroller and MCP4901 DAC. Generates clean sine, triangle, and square waveforms with amplitude control via potentiometer, mode selection via buttons, and visual feedback through status/signal LEDs.
Designed for lab and bench use with an SWD programming header, multiple test points, and robust power protection.
Table of Contents
- Schematic
- Layout
- 3D Model
- Overview
- Specifications
- Results
- Software
- Tech Stack
- Equipment
- Manufacturing
- Repository Structure
- Contact
- License
Schematic
Layout
3D Model
Overview
The board is a compact USB-powered waveform generator centred on an STM32C031K6T6 microcontroller.
| Section | Description |
|---|---|
| Digital Core | The STM32 generates waveform data and drives an MCP4901 8-bit SPI DAC. |
| Analog Front-End | A TLV2372 dual op-amp and discrete MOSFET switching produce clean sine, triangle, and square outputs. |
| User Interface | Three tactile switches provide waveform selection, mode/settings control, and reset. Five status/signal LEDs provide visual feedback, while a potentiometer controls amplitude. |
| Power | A USB Micro-B input supplies the board through an LM1117 3.3 V regulator with polyfuse protection. |
Specifications
| Parameter | Value |
|---|---|
| Microcontroller | STM32C031K6T6 |
| DAC | MCP4901, 8-bit SPI |
| Waveforms | Sine, triangle, and square |
| Sine/Triangle Frequency Range | 1 Hz–50 kHz |
| Square-Wave Frequency Range | 1 Hz–100 kHz |
| Amplitude | 0–3.0 Vpp, controlled by potentiometer |
| Output Impedance | ~50 Ω |
| Power Input | 5 V USB |
| Typical Current | 28 mA |
| Maximum Current | 45 mA |
| Regulation | 3.3 V ± 1.5% |
| Board size | 52 mm × 48 mm |
Results
PCB measurements from the hand-soldered prototype:
| Waveform | Frequency | Amplitude | THD / Rise-Fall | Notes |
|---|---|---|---|---|
| Sine | 1 kHz | 2.98 Vpp | 0.72% THD | Clean across the full range |
| Triangle | 1 kHz | 2.95 Vpp | — | Linear slope confirmed |
| Square | 10 kHz | 3.01 Vpp | 12 ns / 14 ns | Fast edges with minimal ringing |
Frequency response, amplitude accuracy (±1.2%), and load regulation were verified using an Agilent Technologies InfiniiVision MSO-X 3034A and Digilent Analog Discovery 3.
Software
The firmware targets the STM32C031K6T6 and is written in C.
Programming
- Create a new STM32CubeIDE project targeting the STM32C031K6T6.
- Replace the generated
Core/Src/main.cwithSoftware/main.c. - Configure the required GPIO, SPI, ADC, and timer peripherals.
- Connect an ST-Link/V2 to the SWD header.
- Build and flash the firmware through SWD.
Tech Stack
| PCB Design | Firmware Development | Version Control | Repository Hosting | Circuit Simulation | IDE | Language |
|---|---|---|---|---|---|---|
 |  |  |  |  |  |  |
Equipment
| Tool | Model | Purpose |
|---|---|---|
| Oscilloscope | Agilent Technologies InfiniiVision MSO-X 3034A | Waveform capture, THD, and rise/fall-time measurements |
| Mixed-signal tool | Digilent Analog Discovery 3 | Frequency-response and spectrum analysis |
| Multimeter | Tektronix DMM4020A | DC accuracy and current-draw measurements |
| Programmer | ST-Link/V2 | Firmware flashing and SWD debugging |
| USB Power Analyzer | — | Input-current and efficiency verification |
| Soldering station | — | Hand assembly of all SMD and through-hole components |
Manufacturing
Production files are provided in the Manufacturing directory:
BOM.csv— Bill of materialspositions.csv— Component placement dataGerbers— Copper, mask, silkscreen, paste, outline, and drill files
Verify all fabrication outputs against the KiCad design before ordering.
Repository Structure
STM32-Based_Programmable_Waveform_Generator
├── Docs Contains board related images
│ └── Images Contains images of the board render, board layout, and board schematic
│ ├── STM32-Based_Programmable_Waveform_Generator_3D_Model.png 3D model in PNG format
│ ├── STM32-Based_Programmable_Waveform_Generator_Schematic_Layout.png Layout in PNG format
│ ├── STM32-Based_Programmable_Waveform_Generator_Schematic.png Schematic in PNG format
│ └── STM32-Based_Programmable_Waveform_Generator_Schematic.pdf Schematic in PDF format
├── Hardware Contains all KiCad PCB files
│ └── KiCad_Files Contains 3D models for board render, footprints for layout, KiCad project files, and symbols for schematic.
│ ├── 3D_Models Contains STP files for the 3D render of the board
│ │ ├── LM1117IMP-3-3-NOPB.stp STP for LM1117IMP-3-3-NOPB linear voltage regulator
│ │ ├── TC33X-2-XXX.stp STP for TC33X-2-102E potentiometer
│ │ └── USB-B-Micro.stp STP for USB-B-Micro
│ ├── Footprints Contains footprints for PCB components
│ │ └── LM1117.pretty Contains LM1117 footprints
│ │ ├── DCY0004A_L.kicad_mod
│ │ ├── DCY0004A_M.kicad_mod
│ │ └── DCY0004A_N.kicad_mod
│ ├── STM32-Based_Programmable_Waveform_Generator.kicad_pcb KiCad PCB file
│ ├── STM32-Based_Programmable_Waveform_Generator.kicad_pro KiCad project file
│ ├── STM32-Based_Programmable_Waveform_Generator.kicad_sch KiCad Schematic file
│ ├── sym-lib-table
│ └── Symbols Contains schematic symbols for PCB schematic
│ └── LM1117 Contains LM1117 linear voltage regulator symbolContact
- GitHub: @devjamescollier
- Email: jwcollie@usc.edu
License
Copyright © 2026 James Collier
The hardware design files are licensed under the CERN Open Hardware Licence Version 2 – Permissive. See LICENSE.
The firmware is licensed under the MIT License. See Software/LICENSE.
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100n | Capacitor_SMD:C_0805_2012Metric | C1, C3, C4, C5, C9, C10 |
| 5 | 220 | Resistor_SMD:R_0805_2012Metric | R6, R10, R12, R13, R14 |
| 4 | 10k | Resistor_SMD:R_0805_2012Metric | R5, R7, R9, R11 |
| 4 | TestPoint | TestPoint:TestPoint_THTPad_D2.5mm_Drill1.2mm | TP1, TP2, TP3, TP4 |
| 2 | 10u | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A | C7, C8 |
| 2 | 4k6 | Resistor_SMD:R_0805_2012Metric | R2, R4 |
| 2 | IRLML0030 | Package_TO_SOT_SMD:SOT-23 | Q3, Q4 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric | C11 |
| 1 | 10u | Capacitor_SMD:C_1206_3216Metric | C2 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C6 |
| 1 | 560 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 5k6 | Resistor_SMD:R_0805_2012Metric | R8 |
| 1 | 6.8k | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | Conn_01x02 | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J3 |
| 1 | Conn_01x05 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Horizontal | J1 |
| 1 | LED_SETTINGS_1 | LED_SMD:LED_0805_2012Metric | D4 |
| 1 | LED_SETTINGS_2 | LED_SMD:LED_0805_2012Metric | D5 |
| 1 | LED_SIGNAL_1 | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | LED_SIGNAL_2 | LED_SMD:LED_0805_2012Metric | D2 |
| 1 | LED_SIGNAL_3 | LED_SMD:LED_0805_2012Metric | D3 |
| 1 | LM1117IMP-3.3/NOPB | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U4 |
| 1 | MCP4901 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | Polyfuse | Fuse:Fuse_1206_3216Metric | TH1 |
| 1 | RESET_SW | Button_Switch_THT:SW_PUSH_6mm | SW2 |
| 1 | R_Potentiometer | Potentiometer_SMD:Potentiometer_Bourns_TC33X_Vertical | RV1 |
| 1 | SETTINGS_SW | Button_Switch_THT:SW_PUSH_6mm | SW3 |
| 1 | SIGNAL_SW | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | STM32C031K6Tx | Package_QFP:LQFP-32_7x7mm_P0.8mm | U1 |
| 1 | TLV2372 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U5 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Amphenol_10104110_Horizontal | J2 |
Questions
How big is the STM32-Based Programmable Waveform Generator PCB?
It measures 52 × 48 mm and has 2 copper layers, 1.6 mm thick.
What parts does the STM32-Based Programmable Waveform Generator use?
48 parts, built around the MCP4901-E/P, TLV2372IP, LM1117IMP-3.3/NOPB-HXY and IRLML0030. 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 STM32-Based Programmable Waveform Generator KiCad files?
From the devjamescollier/STM-32_Based_Waveform_Generator repository on GitHub, at the commit this page was made from: the board is Hardware/KiCad_Files/STM32-Based_Programmable_Waveform_Generator.kicad_pcb and its schematic Hardware/KiCad_Files/STM32-Based_Programmable_Waveform_Generator.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the STM32-Based Programmable Waveform Generator design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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