IoT & Embedded Systems Developer

S1 Teknik Komputer student at Universitas Amikom Yogyakarta, focused on Internet of Things and Embedded Systems — building connected systems that run in the field, from ESP32 firmware to cloud dashboards.

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01 // About

Engineer wired
for connected systems.

FOCUS: IoT · Embedded
STATUS: Open to work

I'm Wildan Alfa Raezel, currently an S1 Teknik Komputer student at Universitas Amikom Yogyakarta, with a focus on Internet of Things and Embedded Systems.

Across coursework, commissioned projects, and personal builds, I have worked on the full IoT signal path: from sensor and PCB to MQTT broker and dashboard. My strongest skills are in embedded firmware (C/C++, MicroPython) and IoT communication protocols.

What matters most to me is systems that keep working after handover. The devices I build have to withstand dropped networks and power cuts, and keep running in daily use without me nearby.

0
Projects Built
0
Live Deployments
0
Competition Awards
02 // Education

Formal training
& foundations.

DEGREE: S1
FIELD: EE / CE
S1
2023 — Present

Bachelor of Computer Engineering (S.Kom)

Teknik Komputer
Universitas Amikom Yogyakarta
Concentration
Internet of Things
Status
Active Student Expected graduation 2027
03 // Capabilities

From sensor
to dashboard.

Eight domains, one signal path. Click any chip to see what I've shipped with it.

TOTAL_NODES: 64
CATEGORIES: 8
MCU
A.HW

Hardware & MCU

Boards, modules, and sensors I reach for first.

ESP32 ESP8266 Arduino Uno/Mega/Nano RPi Pico STM32 NodeMCU GRBL G-code Soldering & PCB Assembly PZEM-004T RC522 RFID Relay Module LCD 16x2 MicroSD Module Ethernet Module TP4056 Solar Panel Vibration Motor DHT22 BMP280 MPU6050 PIR
B.NET

Communication Protocols

Wired and wireless — short range to cellular.

MQTT HTTP/REST WebSocket BLE Wi-Fi GSM/NB-IoT LTE-M Modbus RS-485
$ make building...
C.LANG

Programming Languages

From bare-metal firmware up to web dashboards.

C ++
C / C++
Python
µPy
MicroPython
JS
JavaScript
Flask
node
Node.js
Flutter
Dart
D.CLOUD

Cloud & IoT Platforms

Where the devices report home.

Blynk ThingSpeak Firebase RTDB Azure App Service
E.DATA

Database & Pipeline

Realtime NoSQL, relational, and MQTT brokers.

Firebase (NoSQL) Firebase Firestore MySQL PostgreSQL Mosquitto HiveMQ
F.VIZ

Visualization & Dashboards

Dashboards and charts for live device data.

React + Recharts D3.js
G.OPS

DevOps & Tools

Build, deploy, simulate, debug.

Git/GitHub Docker PlatformIO Arduino IDE EAGLE EasyEDA Fritzing VS Code
H.SOFT

Soft Skills

The parts no library ships with.

Problem Solving Technical Writing Team Collaboration Agile / Scrum Mentoring
04 // Featured Work

Selected projects.
Built, deployed, running.

A slice of recent builds. Click any card for the full case study.

PROJECTS: 5
BELL ESP32 · 5V/1A MQTT BROKER mosquitto vibradoor/bell/ring → publish ALERT ESP32 · LiPo 2000mAh ASSISTIVE IoT · DOORBELL → WEARABLE · MQTT SLB DAMAYANTI · 2025
Live PRJ_001
01

VIBRADoor — Wireless Vibrating Doorbell for Deaf Students

ESP32 + MQTT wireless doorbell system for deaf students — a commissioned build. A bell button at the classroom door sends a vibration alert to a wearable wristband worn by the student. One pair is deployed and in daily use at SLB Damayanti Sleman, Yogyakarta. Total BOM: Rp 366k per pair.

ESP32 DevKitMQTTMosquittoLiPo 2000mAhTP4056Vibration Motor 10mmCustom PCB
Read Case Study
ESP32 ESP32 DEVKIT V1 PZEM-004T V · I · P · E RC522 RFID 13.56 MHz RELAY 10A AC POWER CTRL AZURE paycay-app.azurewebsites.net ADMIN DASHBOARD kWh / hour · live SPKLU IoT + WEB · ESP32 ↔ FLASK / FIREBASE / AZURE
Live PRJ_002
02

PAYCAY — Smart EV Charging Station (IoT + Web)

End-to-end EV charging station (SPKLU) management system: ESP32 firmware (PZEM-004T + RC522 RFID + AC relay), Flask + Firebase Realtime DB backend, real-time web dashboard over Socket.IO, deployed on Microsoft Azure App Service.

ESP32PZEM-004TRC522 RFIDFlaskFirebase RTDBSocket.IOAzure
Read Case Study
PAYCAY STN001 22 kW · AC LIVE SENSOR · RTDB VOLT 220.4 V AMPERE 3.42 A POWER 754 W ENERGY 1.84 kWh COST Rp 4.602 SPKLU · ESP32 + PZEM-004T → FIREBASE RTDB
Live PRJ_003
03

PAYCAY Mobile — Companion App

Flutter companion app for the PAYCAY SPKLU system. Real-time ESP32 (PZEM-004T) sensor monitoring via Firebase RTDB, a digital wallet, and an admin panel — separate User and Admin sides.

FlutterFirebase RTDBFirestoreRiverpodGoRouterFCM
Read Case Study
07:02 HADIR TAP ESP32 · RC522 · KEYPAD ETHERNET W5500 SD CARD store & forward presensi-smpn2-paliyan.my.id DASHBOARD · HARI INI 312 HADIR 18 TERLAMBAT 7 ALPHA 7 HARI IoT PRESENSI · RFID + KEYPAD → FLASK / FIRESTORE SMPN 2 PALIYAN · 2026
Live PRJ_004
04

Presensi SMPN 2 Paliyan — IoT School Attendance (RFID + ESP32)

IoT school attendance system for SMPN 2 Paliyan — a campus/community project with the school as partner. Students tap an RFID card on an ESP32 gate device (or enter their NIPD on the keypad as a fallback), data flows to a Flask server, and attendance is monitored in real time through an admin dashboard and a parent portal. The device is installed and in daily use.

ESP32RC522 RFIDKeypad 3x4LCD 16x2Ethernet W5500SD CardRTC DS3231UPS BackupFlaskFirebase Firestore
Read Case Study
EMERGENCY ESP32 · KEYPAD 4x4 · LCD HTTPS EDGE FUNCTION supabase · cron FIRESTORE + FCM push PANIC Gedung 1 · 2 dtk lalu QUICK ROOM PHONE FLUTTER · PETUGAS EMERGENCY ALERT · ESP32 → EDGE FUNCTION → FCM EIAS · 2026
In Progress PRJ_005
05

EIAS — Emergency Input & Alert Station

Integrated emergency-button system for a campus environment: an ESP32 field station (panic button, 4x4 keypad, I2C LCD) forwards alerts in real time to a Flutter app for on-duty officers — with push notifications that arrive even when the app is closed, and running entirely on free-tier services. 2nd place at AMICTA 2026 and a registered software copyright (HKI).

ESP32Keypad 4x4LCD I2CFlutterCloud FirestoreFirebase FCMSupabase Edge FunctionsOpenStreetMap
Read Case Study
BELL ESP32 · 5V/1A MQTT BROKER mosquitto vibradoor/bell/ring → publish ALERT ESP32 · LiPo 2000mAh ASSISTIVE IoT · DOORBELL → WEARABLE · MQTT SLB DAMAYANTI · 2025
Live PRJ_001
ESP32 ESP32 DEVKIT V1 PZEM-004T V · I · P · E RC522 RFID 13.56 MHz RELAY 10A AC POWER CTRL AZURE paycay-app.azurewebsites.net ADMIN DASHBOARD kWh / hour · live SPKLU IoT + WEB · ESP32 ↔ FLASK / FIREBASE / AZURE
Live PRJ_002
PAYCAY STN001 22 kW · AC LIVE SENSOR · RTDB VOLT 220.4 V AMPERE 3.42 A POWER 754 W ENERGY 1.84 kWh COST Rp 4.602 SPKLU · ESP32 + PZEM-004T → FIREBASE RTDB
Live PRJ_003
07:02 HADIR TAP ESP32 · RC522 · KEYPAD ETHERNET W5500 SD CARD store & forward presensi-smpn2-paliyan.my.id DASHBOARD · HARI INI 312 HADIR 18 TERLAMBAT 7 ALPHA 7 HARI IoT PRESENSI · RFID + KEYPAD → FLASK / FIRESTORE SMPN 2 PALIYAN · 2026
Live PRJ_004
EMERGENCY ESP32 · KEYPAD 4x4 · LCD HTTPS EDGE FUNCTION supabase · cron FIRESTORE + FCM push PANIC Gedung 1 · 2 dtk lalu QUICK ROOM PHONE FLUTTER · PETUGAS EMERGENCY ALERT · ESP32 → EDGE FUNCTION → FCM EIAS · 2026
In Progress PRJ_005
05 // Track Record

A timeline of
real work.

NODES: 5
SPAN: 2022 → 2025
Apr – Jul 2026

Campus Project · Presensi SMPN 2 Paliyan — School Attendance

SMPN 2 Paliyan (partner school) · Gunungkidul
  • IoT-based school attendance system (campus/community team project) — installed and used for daily attendance at SMPN 2 Paliyan.
  • My contribution: the ESP32 firmware, the gate-device hardware assembly (RC522 RFID, keypad, LCD, DS3231 RTC, W5500 Ethernet, SD card, UPS backup), and the backend server (Flask + Firebase Firestore).
  • Fault-tolerant device: SD-card store-and-forward through network drops and a UPS through power outages; watchdog + scheduled reboot for 24/7 operation.
ESP32RC522 RFIDEthernet W5500FlaskFirebase Firestore
Feb – Jul 2026

Lab Assistant · Data Acquisition Systems (IoT Concentration)

Universitas Amikom Yogyakarta · Computer Lab
  • Assisted the Data Acquisition practicum (IoT concentration): guided students through sensor reading, data logging, and telemetry on ESP32.
  • Prepared weekly practicum materials and helped debug student wiring and firmware during lab sessions.
ESP32Arduino
Sep 2025 – Feb 2026

Competition Project · PAYCAY — Smart EV Charging

Independent · Yogyakarta
  • Developed PAYCAY, an end-to-end smart EV charging station (SPKLU) system that won 1st place (Produk IoT) at ARCADIA 2026 — built solo across firmware, backend, web, and mobile.
  • ESP32 firmware (PZEM-004T metering + RC522 RFID + AC relay), Flask backend with a real-time Socket.IO dashboard, Firebase Realtime DB, and a Flutter companion app.
  • Deployed live on Microsoft Azure App Service; applied advanced Python (OOP, ABCs, decorators, design patterns).
ESP32FlaskFirebaseSocket.IOFlutterAzure
Feb – Jul 2025

Lab Assistant · Hardware Development

Universitas Amikom Yogyakarta · Computer Lab
  • Guided students through GRBL parameter configuration, steps/mm calibration, and converting vector files into G-code for the 2D plotter project in weekly practicum sessions.
  • Prepared the practicum modules and G-code sender software, and helped debug students' X-Y axis motion commands and pen-lift PWM signals during lab sessions.
  • Coached students on serial-communication troubleshooting, feed-rate tuning, and integrating the controller firmware with the plotter mechanics.
ArduinoGRBLG-codeStepper MotorPWM
Apr – Jun 2025

Commissioned IoT Builder · VIBRADoor

Independent · Yogyakarta
  • Built VIBRADoor, a wireless vibrating doorbell for deaf students at SLB Damayanti Sleman — a commissioned project; one pair deployed and still in daily use.
  • Owned the ESP32 firmware and hardware assembly of both the bell unit and the wearable, communicating over a self-hosted MQTT (Mosquitto) broker.
  • Designed for field maintenance: custom PCB with swappable modules and LiPo + TP4056 power; total BOM Rp 366k per pair.
ESP32MQTTMosquittoCustom PCB
06 // Verified

Certifications
& achievements.

VERIFIED: 4
ACHIEVEMENTS: 4

CCNAv7: Introduction to Networks

Cisco Networking Academy
Completed Aug 2024
ID: 6bd505b3-7acc-4f70-b5ba-05424ae229f1

CCNA: Switching, Routing & Wireless Essentials

Cisco Networking Academy
Completed Mar 2025
ID: f8e80bd1-e91e-4cf0-919f-0840ed7bcdc1

CCNA: Enterprise Networking, Security & Automation

Cisco Networking Academy
Completed Jul 2025
ID: 59fcddb5-bfce-44ef-8d7d-b431c87be388

Network Security

Cisco Networking Academy
Completed Jul 2026
ID: 60d09bd7-c26a-4dc0-b021-3df0fd043c7e

1st Place — ARCADIA 2026 (IoT Product)

Amikom Arena Creative Application, Digital Innovation & Multimedia (ARCADIA) 2026 — Faculty of Computer Science, Universitas Amikom Yogyakarta. Winning entry: PAYCAY (Smart EV Charging Station).

2nd Place — AMICTA 2026 (Internet of Things)

AMICTA 2026 "Kick Off Your Creative Innovation" — Faculty of Computer Science, Universitas Amikom Yogyakarta. Winning entry: EIAS (Emergency Input & Alert Station).

Honorable Mention (Juara Harapan II) — Indonesia National IT Competition 2025 (IoT)

INDONERIS 2025, IoT category — a national competition hosted by Universitas Amikom Purwokerto (team entry).

Copyright (HKI) — Emergency Input & Alert Station (EIAS) v1.0

Official Indonesian software copyright (Hak Cipta, DJKI Kemenkumham), reg. no. 001273262 (2026) — listed as a co-creator; rights held by LPPM Universitas Amikom Yogyakarta.

09 // Get In Touch

Let's build
something connected.

Have an IoT project, a role, or an idea in mind? I'm open to internships, contract work, and freelance projects — and I reply to every message.

wildanraezel@gmail.com
Universitas Amikom Yogyakarta — Jl. Ring Road Utara, Condong Catur, Sleman · ID
GMT+7 · Replies within 24h
Entry-Level
Internship
Freelance