mp3 speakers

for an upcoming installation we need a few speakers hanging on the walls playing back sound files in a loop. i found the dfplayer mini to work well. it's a small and cheap board that can play soundfiles from a sd-card and it has a built-in 3W amplifier. with a decent 5v batterybank (here 4400mAh) it can run for ~4 days continuously.

mp3speakers