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armod
Can I use leds on the discovery board? And not the external leds?
mchip
Yes, you can. The only reason

Yes, you can. The only reason external leds are used instead of onboard leds so that we can also learn how you can connect external componenets also using breadboard and wires. because in many other tutorials we have used external electronic componenets like various kind of sensors which are not already present on the discovery board. so if you learn about how to connect external componenets using breadboard and wires then it will easy for you to make many good projects and you will not be only limited to discovery board only.