I will write esp32 or arduino firmware for your sensor project

The sensor reads fine on the bench. Getting it to send data somewhere, reliably, for months, is the part that eats weekends.

I write firmware for ESP32 and Arduino that reads your sensors and pushes data out over MQTT, HTTP, or Modbus. WiFi reconnect, buffering when the network dies, watchdog timers the boring parts that decide whether it's still running on day ninety.

WHAT I HANDLE

- I2C, SPI, UART, analog sensors, Modbus RTU and TCP devices

- MQTT, HTTP, WebSocket, BLE

- OTA updates, WiFi config portals, deep sleep for battery nodes

- Local buffering to SD or flash when the connection drops

HOW IT WORKS

Tell me your board, your sensors, and where the data needs to go. I confirm the wiring before writing a line of code cheaper than replacing a fried board.

WHAT YOU GET

- Full source, PlatformIO or Arduino IDE, your choice

- Wiring notes and library list

- Serial debug output so you can see what it's doing

Four years in robotics and industrial IoT. The devices I've shipped run unattended outdoors, which is a fair test of whether firmware is actually finished.

I can't test on hardware I don't own, so you run the final check. Anything that doesn't work, I fix.