Resources:
1. MIKROBUS extension boards: 
   https://www.digikey.com/en/products/filter/evaluation-boards-expansion-boards-daughter-cards/797?s=N4IgTCBcDaILYEsDWAnA9gIwK4GcQF0BfIA
2. QWIIC extension boardsL
   https://www.digikey.com/en/products/filter/evaluation-boards-expansion-boards-daughter-cards/797?s=N4IgTCBcDaII4HcCWSDGIC6BfIA
   
Project ideas:

1. Design secure on/off switch that controls two external loads via Bluetooth. Connection must be allowed
with paired clients only. The on-board button will be used for erasing all previous bondings (single click)
and for allowing new bondings (long press). Erasing of bondings and new bondings options must be confirmed 
via command-line interface (terminal window). Pairing method must be based on the numeric comparison 
approach. 
For this project you will need MIKROE-1370 external board 
https://www.digikey.com/en/products/detail/mikroelektronika/MIKROE-1370/4495445
and solder 2 pin headers on it
https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/61300811121/4846839

2. Design running text application ona 8x8 dot matrix. The text can be loaded via Bluetooth interface.
It could be a phrase, announcement, time, etc. It could also be a game with keys pressed on a computer 
keyboard, in which case Bluetooth interface is optional. 
For this project you will need to purchase either
MIKROE-1294 or MIKROE-1295 extension board and solder 2 pin headers on it (included).
https://www.digikey.com/en/products/detail/mikroelektronika/MIKROE-1294/4495426

3. Design a soil moisture monitor. Once the the moisture level gets below the set threshold,
your app will be sending notifications to connected Bluetooth client. The threshold must be 
set also via Bluetooth.
For this project you will need to purchase moisture sensor 
https://www.digikey.com/en/products/detail/seeed-technology-co-ltd/101020008/5482619

4. Design data logger for various sensors. The data can be stored in microcontroller's memory or
external memory board like MIKROE-4067
https://www.digikey.com/en/products/detail/mikroelektronika/MIKROE-4067/12171849
The sensor can be connected via the qwiic connector. A lot of various sensors are available at
https://www.digikey.com/en/products/filter/evaluation-boards-expansion-boards-daughter-cards/797?s=N4IgjCBcpgHAzFUBjKAzAhgGwM4FMAaEAeygG0QAWABjDADZ6QBdIgBwBcoQBlDgJwCWAOwDmIAL5EAtACYkIVJAEBXQiXIgArCwlSQ8yBQCOAd0GDUzCUA
for example, for pressure/temperature/humidity/gas
https://www.digikey.com/en/products/detail/sparkfun-electronics/SEN-16466/12340133
The data can be read via Bluetooth interface and/or dumped to the terminal window.

Interface can be combined with external display
https://www.digikey.com/en/products/filter/evaluation-boards-expansion-boards-daughter-cards/797?s=N4IgjCBcpgHAzFUBjKAzAhgGwM4FMAaEAeygG0R54BOAFgHYAmEAXSIAcAXKEAZU4BOASwB2AcxABfSUWaQKARwDuQoahaSgA
and/or qwiic sensor board

5. Design a proximity sensor that will log time when an object passed by.
Possible sensors are PIR, e.g. SEN-17374 or MIKROE-1589
Examples include MIKROE-4267 sensor for optical pulse oximetry.