I've designed many projects using Arduino, PIC, ESP8266/ESP32 and other controllers. Some of them are listed below.
ESP8266 based Fish Aquarium Automation. This project I installed in my house, which automates the temperature, chlorine, oxygen pressure and other things inside the Fish Aquarium. I've designed all the Circuit Boards and fabricated them from China. I'm also planning to automate the food process inside the aquarium.
Datalogger based upon ESP8266. This project was using SHT21 humidity and temperature sensor, BQ31500 battery fuel gauge senor and MQ7/MQ5/MQ135 sensors which were used for concentration of poisonous gases. The data was sent to the server via WiFi channel through MQTT Protocol.
ESP32 based Home Automation and Security System. This was my final year project and my research project when I was working in LUMS university. I along with my team designed low code sensor modules which would be installed in consumer house to monitor different data.
Digital Marketing using ESP32 Bluetooth Low Energy. This project was using ESP32's BLE system to advertise different web addresses to iOS and Android phones using eddystone configurations. I used this to advertise the sales of different shopping malls so that people which get in range of the system get pop up notification about the sales and promotion for that shop.