Can I use the ethereum blockchain to organize a raffle for charity?

Hi. My friends have been raffling objects they made and donating the pooled money to charity. The way it works is people send them USD using venmo or paypal and then whoever set up the raffle donates that money that is being pooled to a charity. The issue is that to donate you have to trust that they won't pocket the money. This trust system limits who are comfortable participating in the raffle, in a sense the raffle can't expand beyond a close network of known people. Would there be a way to set up a crypto wallet that people can send crypto to that can be audited by everyone? It would also be interesting if the wallet would automatically send the money to charity at a set date. In essence, a system that is programmed to pool the money, securely and transparently, and then send it to a charity without needing human input.

The potential resistance to using cryptocurrency for this is that I suspect most people participating in the raffles do not have much crypto experience. There are also transaction fees to consider as well as the issue of potentially having to convert the crypto to USD before donating it. It would be extra cool if the wallet can pick a raffle winner as well! If anybody has any ideas or suggestions I would appreciate it!

I posted this question on r/cryptocurrencies and was told that this is basically a smart contract. Are there places where I can learn how to develop one?