Am I obligated to deposit funds in my account?

If you only use your 'free parking days', you do not need to deposit funds. You will not receive a message when your free parking days have been used up.
On your personal page of (H)eerlijk Parkeren, you can check how many days you have left, and in “(H)eerlijk Parkeren” you can keep track of your parking history (Number of € 0,00 days you parked).

In order to be able to park at the TU/e for € 2,- a day, you will need to deposit a minimum amount of € 25 on your account. If you wish to terminate your subscription, the funds that you still have in your parking account, will be transferred to your bank account.