I made a monitoring station with GSM SIM messages for reporting several variables like temperature, particles detection, pollution, etc. It was based on SIM7000 module and ESP32 microcontroller.
I was working on a smart watch based on NRF52832 with BLE and I2C heart rate pulse and oximeter. This device has some services and characteristics for the heart rate, oxygen in blood and battery voltage. The data was sent to the Nordic BLE app and the software team was in charge of reading those services and characteristics.
I designed an Iot button for WeWork and Coca Cola campain, where if you pushed the button, an Icon appears in a web page with the map of the WeWork, telling you where was pusshed. This was made truough ESP32 and web sockets.
I worked on a project Called Redspira, there was a ntwork of ESP32 based sensors with several kinds, like CO2, particles, O2, O3, presasure, temperature sensors, which reported their data to a server for showing in the map.
One of my biggest designs with ESP32 was a robot vehicle called Robbus Kidsy. It has two wheels, color sensor, Neopixel, buzzer and LEDs, And the library I made was capable of connecting to any other device by Wifi or Bluetooth.
Recently I worked in the development of an injection device with a touch screen and heart rate sensor. The screen was programmed with a user interface that showed a chart of the heart beats, heart beats per minute, and it has 3 different touch screen buttons for user interaction.