You can use reactions on your board's noticeboard to create a poll for all the members of the board to answer.
To set up a poll, simply write a message or ask a question on the noticeboard and use emojis to define which reaction you want to use for each answer.
The members of your board can then add a reaction for their answer or vote.
Note: reactions are not anonymous so be sure to only use this when it's ok for everyone to see each other's votes!