Configurable Pulse Generator & Counter Instrument (STM32)

Two-board STM32 instrument that generates and counts configurable pulse trains (including NAMUR-style signals) from a CSV-defined sequence, with opto-isolated I/O, relay outputs, OLED + rotary-encoder UI, and a DIN-rail enclosure.

HardwareFirmwareSTM32PCBInstrumentationSHIPPED

# ELECTRICAL CHARACTERISTICS

MCU:STM32 (ARM Cortex-M)

Signal types:Square wave · NAMUR

I/O:5–12V opto-isolated

Outputs:2× relay

UI:OLED + rotary encoder

Storage:microSD (CSV sequence)

Enclosure:DIN-rail mount

# HARDWARE PHOTOS

Configurable Pulse Generator & Counter Instrument (STM32)

# WHAT I DID

project-log.txt

▸Designed a two-board STM32 system — UI board (OLED, encoder, buttons, microSD) and main board (MCU, power regulation, opto-isolated I/O) — connected board-to-board to fit a narrow DIN-rail enclosure.

▸Implemented opto-isolated digital I/O to interface 5–12V field-level signals with the 3.3V MCU domain, plus two relay outputs.

▸Developed firmware that reads a CSV pulse sequence from microSD, generates configurable square-wave and NAMUR pulse trains, counts incoming pulses, and triggers relay outputs on a configurable delay.

▸Built an on-device menu (rotary encoder + OLED) for live configuration and pulse/count readout.

▸Packaged in a DIN-rail-mountable enclosure with terminal-block connectors.

# TEST RESULTS

[ OK ]Fully assembled two-board instrument validated against required waveforms and delivered for field use.

[ OK ]Iterated to a second hardware revision based on field-validation feedback.

[ OK ]Interconnect and operating documentation delivered alongside the hardware.

← $ cd ../