Industrial Alarm & Signaling Controller
Custom PCB and STM32 firmware development for a heavy-duty industrial warning system with multiple wired alarm inputs, configurable light behavior and synchronized audible-visual signaling.
STM32 · PCB Design · Embedded C · Industrial Signaling · Product Development
Engineering case study based on the ESP Series Heavy-Duty Warning Light developed at Mucco Sinyalteknik.
PROJECT OVERVIEW
From Electronic Design to a Production-Ready Warning System
The ESP Series is a heavy-duty industrial warning product designed to provide both audible and visual signaling. The controller uses multiple wired inputs to select different warning behaviors and combines sound generation with controlled light output.
In this project, I was responsible for the electronic controller board design and the embedded firmware development using STM32. The system was developed as a complete hardware-software platform intended for practical industrial use and production.
PCB Design · Hardware Development · STM32 Firmware
STM32
7 Alarm Inputs + Common
Sound + Visual Signaling
Hardware · Firmware · Testing · Product Revision
One Controller, Multiple Warning Behaviors
The controller needed to reliably interpret multiple wired control inputs and translate each input condition into a predefined audible warning behavior.
The system uses eight external wires in total: seven control inputs and one common connection. Applying the required voltage to a specific input allows the controller to activate the corresponding alarm behavior.
For RGB versions, the system also needed to control visual signaling while allowing light and sound to operate simultaneously as a coordinated industrial warning system.
CONTROL INPUTS
COMMON LINE
ALARM SELECTION
LIGHT + SOUND OUTPUT
Wired Input Control with Synchronized Sound and Light
Each control input represents a defined warning command. The embedded firmware evaluates the input state and selects the required audible and visual behavior.
The system provides seven different alarm selections through wired control. In RGB versions, the controller also supports multiple color outputs and different lighting behaviors, allowing visual signaling to operate together with the audible warning.
INPUT DETECTION
Seven independent control inputs are continuously evaluated by the controller.
ALARM SELECTION
Each valid input condition activates its assigned audible warning behavior.
LIGHT CONTROL
RGB versions support multiple colors and selectable visual warning modes.
Steady · Flashing · Police-Style Flashing · Light Off
SYNCHRONIZED OUTPUT
Sound and light can operate together as a coordinated industrial warning signal.
Hardware and Firmware Developed as One Integrated System
My work on this product covered both the electronic hardware and the embedded software. This allowed the PCB, microcontroller, inputs and outputs to be developed and evaluated as one complete product rather than as separate engineering tasks.
HARDWARE DESIGN
Development of the controller electronics, circuit architecture, component selection and electrical interfaces required for the industrial warning system.
PCB DEVELOPMENT
Schematic capture, PCB layout, component placement and production-oriented board preparation for the product controller.
STM32 FIRMWARE
Embedded firmware development for input detection, alarm selection, light control, operating logic and coordinated sound-light behavior.
TESTING & PRODUCT REVISION
Functional testing of the hardware and firmware together, followed by revisions according to real product requirements and customer feedback.
Adding User-Controlled Sound Intensity
After the initial product development, a new customer requirement was introduced: the user needed the ability to control the output sound intensity.
The system was therefore revised to support adjustable volume control while preserving the existing warning functions. This required additional hardware and firmware development so that the new feature could be integrated into the existing product architecture without affecting normal operation.
INITIAL VERSION
Fixed Sound Output
The original product provided predefined warning behavior with fixed sound output levels.
UPDATED VERSION
User-Adjustable Sound Intensity
The product was revised to allow the user to control sound intensity while maintaining the existing alarm and lighting functions.
From Schematic to Final Product
Selected stages of the development process, showing the progression from circuit design and PCB implementation to embedded firmware, manufactured hardware and the final industrial product.
01 · CIRCUIT DESIGN
Controller Schematic Design
02 · PCB DESIGN
PCB Layout Development
03 · 3D VERIFICATION
3D PCB Verification
04 · HARDWARE
Manufactured Controller Board
05 · EMBEDDED SOFTWARE
STM32 Firmware Development
06 · FINAL PRODUCT
ESP Series Heavy-Duty Warning Light
A Complete Industrial Hardware–Firmware Platform
The final system combines custom electronics, PCB design and STM32 firmware in a single industrial warning platform capable of processing multiple wired commands and controlling both audible and visual warning behavior.
The project represents a complete product-development workflow—from schematic and PCB design to embedded firmware, testing, manufacturing preparation and later feature revisions based on real customer requirements.
7
WIRED ALARM INPUTS
Multi-input warning selection
STM32
EMBEDDED CONTROL
Firmware-driven system logic
SOUND + LIGHT
INTEGRATED SIGNALING
Coordinated audible and visual warning
PCB + FIRMWARE
COMPLETE DEVELOPMENT
Hardware and software developed together
Need a Custom Electronic Control System?
I provide engineering support for PCB design, embedded firmware, industrial electronics and complete product development—from initial concept and prototyping to testing and production preparation.