Espressif ESP32-S3-MINI-1
ESP32 Hexadecimal Desktop Counter
Overview
An educational desktop hexadecimal counter utilizing an ESP32 microcontroller and an LED cathode display, powered via USB.
SOFIA GUADALUPE GALINDO RAMIREZSystem architecture
POWER
MCU
DISPLAY
ACTUATOR
- POWER → MCUPowerPowers the ESP32-S3 logic rail
- POWER → DISPLAY_DRIVERPowerProvides 5V VBUS rail for LED cathode driving
- POWER → LED_DISPLAYPowerSupplies power to LED segments
- MCU → DISPLAY_DRIVERSPITransmits 8-bit hex segment patterns to constant current driver
- DISPLAY_DRIVER → LED_DISPLAYGPIODrives segments A-G and Decimal Point with regulated current
- INPUT_CONTROL → MCUGPIOSends debounced digital level changes for manual count control
Bill of materials
| Part number | Type | Component | Manufacturer | Package | Qty | Datasheet | Match |
|---|---|---|---|---|---|---|---|
| AMS1117-3.3 | POWER | AMS1117-3.3 Linear Regulator & USB-C Port Provides 5V direct rail for LED segments and regulated 3.3V logic rail from USB-C input | Jiangsu Guorui Microelectronics Co., Ltd. | SOT-223 | 1 | Matched | |
1 alternatives consideredAI verified | |||||||
| ESP32-S3-MINI-1-N4R2 | MCU | Espressif ESP32-S3-MINI-1 Manages system logic, tracks 0-F counter state, processes button inputs, and drives display via SPI | Espressif Systems | SMD | 1 | Matched | |
3 alternatives consideredAI verified | |||||||
| TLC5916IN | DISPLAY | Texas Instruments TLC5916IN Drives the 7-segment display segments with constant current via SPI interface | rochester electronics | — | 1 | Matched | |
| SC56-11WA | DISPLAY | Kingbright SC56-11WA Common Cathode 7-Segment Display Visually outputs hexadecimal digits 0 through F | Multiple | — | 1 | Pending | |
3 alternatives consideredAI verified | |||||||
| PTS645VM31-2 LFS | ACTUATOR | Tactile Pushbuttons (Increment / Decrement) with RC Debounce Provides manual user interface for incrementing and decrementing the hexadecimal counter | C&K | Bulk | 2 | Matched | |
1 alternatives consideredAI verified | |||||||
Build guide
3-4 hoursIntermediate
1
Procurement & Preparation
- Gather all Bill of Materials components including the AMS1117-3.3 regulator, USB-C port, ESP32-S3-MINI-1, TLC5916IN driver, SC56-11WA LED display, and PTS645VM31-2 LFS tactile pushbuttons.
- Inspect the custom PCB for continuity, checking the 5V power rail, 3.3V regulated rail, and SPI routing paths.
2
Hardware Assembly & Wiring
- Solder the USB-C port and AMS1117-3.3 linear regulator circuit onto the PCB, verifying output voltage produces a stable 3.3V.
- Mount and solder the Espressif ESP32-S3-MINI-1 module, Texas Instruments TLC5916IN driver IC socket, and tactile pushbuttons with their RC debounce circuitry onto the board.
- Insert the Kingbright SC56-11WA 7-segment display into its designated footprint and solder all segment pins to the OUT0-OUT7 traces driven by the TLC5916IN.
3
Firmware Setup
- Install the ESP-IDF development framework or Arduino IDE with ESP32 board support packages on your host computer.
- Write and compile the firmware logic to manage the 0-F counter state, read BTN_UP and BTN_DOWN GPIO inputs with debounce handling, and transmit segment data over the SPI interface (SDI, CLK, LE) to the TLC5916IN driver.
- Connect the hexadecimal counter to the computer via USB-C and flash the compiled binary firmware to the ESP32-S3-MINI-1 module.
4
Testing & Calibration
- Power the assembled desktop hexadecimal counter via a standard USB-C power source and verify the power rails provide stable 5V and 3.3V outputs.
- Test the manual user interface by pressing the increment and decrement pushbuttons, observing the SC56-11WA display cycle smoothly through hexadecimal digits 0 through F and wrapping around correctly.
- Perform a final quality control check, ensuring all soldered joints are clean, components are securely fastened, and the desktop enclosure is properly fitted.
Document
ESP32 Hexadecimal Desktop Counter
An educational desktop hexadecimal counter utilizing an ESP32 microcontroller and an LED cathode display, powered via USB.
Design Overview
| Item | Details |
|---|---|
| Product Type | Hexadecimal Counter |
| Key Functions | Hexadecimal counting (0-F), LED cathode display output, Desktop demonstration and educational use, Manual counter increment/decrement controls |
| Power Source | USB-C 5V |
| Connectivity | |
| Size | compact |
| Environment | indoor |
| Difficulty | Intermediate |
| Est. Time | 3-4 hours |
System Architecture
Power Topology: USB-C 5V input provides primary power rail. An AMS1117-3.3 linear regulator steps down 5V to 3.3V for the ESP32-S3 logic and buttons. The raw 5V rail directly powers the TLC5916 driver and LED display for optimal brightness.
Module List
| Module ID | Type | Name | Function | Voltage |
|---|---|---|---|---|
| POWER | POWER | AMS1117-3.3 Linear Regulator & USB-C Port | Provides 5V direct rail for LED segments and regulated 3.3V logic rail from USB-C input | 5V/3.3V |
| MCU | MCU | Espressif ESP32-S3-MINI-1 | Manages system logic, tracks 0-F counter state, processes button inputs, and drives display via SPI | 3.3V |
| DISPLAY_DRIVER | DISPLAY | Texas Instruments TLC5916IN | Drives the 7-segment display segments with constant current via SPI interface | 5V |
| LED_DISPLAY | DISPLAY | Kingbright SC56-11WA Common Cathode 7-Segment Display | Visually outputs hexadecimal digits 0 through F | 5V |
| INPUT_CONTROL | ACTUATOR | Tactile Pushbuttons (Increment / Decrement) with RC Debounce | Provides manual user interface for incrementing and decrementing the hexadecimal counter | 3.3V |
Design Schemes
ESP32-S3 Mini with Dedicated Constant-Current LED Driver ★
Uses an ESP32-S3 Mini communicating with a dedicated constant-current LED driver IC via SPI to handle the hexadecimal display output, supplemented by hardware-debounced tactile buttons for manual increment and decrement control.
Trade-offs: Higher BOM complexity and cost, but superior display brightness stability and minimal MCU software overhead.
Key IC selection
main MCU
- Need: Execute counting logic, process button interrupts, and stream SPI data to the display driver at 3.3V logic levels.
- Class: 32-bit RISC-V Wi-Fi/BLE Microcontroller Module
- Shortlist: Espressif ESP32-S3-MINI-1, Espressif ESP32-C3-MINI-1
- Pick: Select ESP32-S3-MINI-1 for integrated flash, ample GPIO availability, and robust peripheral support.
constant-current LED shift register
- Need: Sink current uniformly across LED segments from a 5V rail while receiving serial data from 3.3V SPI logic.
- Class: 8-bit Constant-Current LED Sink Driver with Shift Register
- Shortlist: TI TLC5916IN, Maxim MAX6971
- Pick: Select TI TLC5916IN for standard DIP/SOIC packaging, built-in constant current regulation, and pin-compatibility with standard 74-series shift registers.
voltage regulator
- Need: Step down 5V USB power to a clean 3.3V rail for the ESP32-S3 module while passing 5V directly to the LED display segments.
- Class: Low-Dropout (LDO) Linear Regulator
- Shortlist: Advanced Monolithic Systems AMS1117-3.3, Microchip MCP1700-3302E
- Pick: Select AMS1117-3.3 for low cost, ease of use, and sufficient output current capability for the MCU and logic.
Risk register
| ID | Area | Severity | Detail | Mitigation |
|---|---|---|---|---|
| r1 | thermal | med | The AMS1117 linear regulator drops 5V to 3.3V; driving multiple segments simultaneously or under heavy continuous load could cause noticeable self-heating on the board due to the linear power drop. | Ensure adequate copper pour around the AMS1117 tab for heat dissipation, or rely on the TLC5916 constant-current limit to restrict total segment power. |
| r2 | supply | low | TLC5916IN is typically packaged in DIP or legacy surface-mount packages which may face availability constraints in pure SMT manufacturing lines. | Verify distributor stock and select the SOIC package variant (TLC5916IDR) if automated surface-mount assembly is utilized. |
Key Components
4/5 modules matched to real parts. See the BOM tab for the full component table.
AMS1117-3.3 Linear Regulator & USB-C Port (AMS1117-3.3)
Candidate 2 explicitly matches the primary MPN 'AMS1117-3.3' for the 3.3V fixed output linear regulator required by the
Espressif ESP32-S3-MINI-1 (ESP32-S3-MINI-1-N4R2)
The candidate ESP32-S3-MINI-1-N8 matches the primary MPN series (ESP32-S3-MINI-1) and manufacturer (Espressif Systems),
Kingbright SC56-11WA Common Cathode 7-Segment Display (SC56-11WA)
Web recommendation: SC56-11WA (not in ES)
Build Summary
- Difficulty: Intermediate
- Estimated time: 3-4 hours
- Tools required: Soldering iron, Solder wire, Digital Multimeter, Flush cutters, Tweezers, Flux pen
See the Build tab for the full step-by-step assembly guide.
Generated by YuanQi AI Design System · Query: Build a hexadecimal counter with a display output using an ESP32.