I've been designing projects using Arduino since my 10th grade. I've built various projects, won competitions and even written custom software to learn more about how arduino works.
I prefer Attiny for mini projects whenever I feel like Arduino is an overkill. I mostly use Attiny as a voltmeter, external memory, etc...
All of my IOT projects so far were built upon ESP8266/NodeMCU. It's low power usage and flexible sleep hours along with built-in wifi module makes it perfect for IOT projects.
I'm experienced in working with Logic Gates family of ICs, Voltage regulators, H-Bridge Drivers, OpAmps and a lot more digital and analog ICs.
A simple and cheap digital multimeter built using attiny-85, IC4026, IC7805 and a 7 segment display.
A Temperature Sensor built using a UltraSonic Distance sensor built upon python library AMD.
A Fibre Optic Communication channel between 2 Arduino capable of transmitting and receiving 8 bit of data.
An IOT robot that can automate pick ,place and search objects placed on a rack or shelf.
A remote safe unlock system built using IR sensors, Arduino and Servos.