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$
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I will write custom arduino firmware for your esp32 with web interface
About this Gig
ESPHome too limited for what you need?
I write proper Arduino/C++ firmware for ESP32 and ESP8266 full control over timing, protocols, and how your device looks and behaves.
I combine modern, efficient development with hands-on hardware experience from 10+ real builds. You get clean, commented C++ code and someone who knows why your sensor flickers at 3 AM.
What I build:
- Arduino sketches / PlatformIO projects
- Custom web UI (HTML/CSS/JS, ESPAsyncWebServer)
- WiFi manager / captive portal
- REST API, WebSocket, MQTT client
- Displays with custom layouts (TFT_eSPI, LVGL light)
- BLE (server, client, beacon, BLE-WiFi bridge)
- RFID/NFC readers (PN532, RC522)
- SPI / I2C / UART / CAN / RS485 / Modbus
- OTA updates
What you get:
complete project, commented code, wiring diagram, flash guide, post-delivery support.
Need ESPHome instead (cheaper, faster)? Check my ESPHome firmware gig. Want your device data charted? See my data dashboard gig. Use Home Assistant? See my HA dashboard gig.
Message me before ordering so we can define the scope. Revisions fix bugs within scope; new features = new order. Hobby use only, not safety-critical.
Based in Germany.
Platform:
ESP32
Expertise:
Firmware development
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Microcontrollers
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IoT
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Programming
My Portfolio
FAQ
Why would I pick this over your ESPHome gig?
ESPHome is great when it fits — but it's declarative YAML with limits on timing, custom protocols, BLE, and how the web UI looks. If you need real C++ control or a properly designed web interface, this gig is the right one.
Do you deliver source code or just compiled firmware?
Both. You always get the full Arduino/PlatformIO project so you can recompile and modify yourself.
Can I still use Home Assistant with this firmware?
Yes, via MQTT. I add HA auto-discovery on request — but if HA integration is your main goal, my ESPHome gig is faster and cheaper.
Which boards do you support?
ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP8266 (NodeMCU, Wemos D1). For exotic variants, message me first.
Can you build NFC/RFID projects?
Yes — tag and card readers (PN532, RC522) for access control, automation triggers or inventory. Note: I don't clone or emulate third-party access or payment cards.
Do you build hardware too?
No, this gig is firmware only. I work from your existing PCB, breadboard setup, or schematic.
What if I need cloud backend / mobile app / database?
Not in this gig — only the ESP side. You can run your own backend, I'll make sure the firmware speaks REST/MQTT/WebSocket cleanly.
What if you can't make it work?
If it's technically not feasible (e.g. board too limited, library missing for your sensor), I tell you upfront before we start. Refunds per Fiverr policy.
