Is it possible to have a dApp automatically and programmatically store a small piece of data on Ethereum, every X minutes, without the need for manually connecting a wallet?

Yes it is possible.

A a wallet is just another Dapp. A non-wlallet Dapp needs an access to an Ethereum node and then it can read blocks or transactions or write / post transactions which include data on the blockchain.

Some details:
- the Dapp has to have an account on the node it does access - the smallest piece of data to write is 32bytes
- it is very expensive to write on blockchains and especially Ethereum mainnet

For even more details please check -
What a Dapp really is

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