Suppose that you are hired by a company that uses a liquid chemical to manufacture different products. The chemical are stored is big glass tanks (about 5 meter high) and is used heavily in their products. As such, maintaining a sufficient amount of the chemical is quite important for the company production.

At the time of your hiring, the company employees used to manually check the chemical level every hour or so and inform the refilling person to fill the tank if the chemical level is below a certain value. Your boss observes that this manual checking procedure is quite inefficient and asks you to come up with a solution that monitors the chemical level after every 10 minutes and displays the chemical level on the computer terminal. The solution should also alert the employees about the low chemical level by displaying a warning on the terminal and by setting a buzzer off for a minute.

How would you implement the automation task using mbed LPC 1768, an active buzzer, and an appropriate sensor? Provide the circuit along with the C/C++ code.