fix typo

dkirkby · Jan 17, 2024 · 63669f2 · 63669f2
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 *Material for a [UC Irvine](https://uci.edu/) course offered by the [Department of Physics Astronomy](https://www.physics.uci.edu/) and developed by [David Kirkby](https://faculty.sites.uci.edu/dkirkby/).*
 
-In this activity, you will learn how to use the joystick as a physical input of both digital and analog information. You will first use the joystick to control and LED, then learn how to read the joystick's digital and analog state using the microcontroller.  This activity assumes you have already [setup your microcontroller](setup.md) and [built your first circuit](first-prog.md).
+In this activity, you will learn how to use the joystick as a physical input of both digital and analog information. You will first use the joystick to control an LED, then learn how to read the joystick's digital and analog state using the microcontroller.  This activity assumes you have already [setup your microcontroller](setup.md) and [built your first circuit](first-prog.md).
 
 ## An LED Circuit using USB Power