Optogenetics has become a ubiquitous tool for studying and controlling the electrical activity in cardiac cells. In this work, we demonstrate optogenetics stimulation using a microLED array. A microLED array with 256 individually addressable switchable pixels (Qubedot GmbH) is integrated in a widefield imaging setup. Localized and patterned stimulation are both demonstrated showing that intensity is sufficient to pace cardiac bodies and bioartificial cardiac tissues. Dynamic control of each individual microLED pixel permits wave steering of calcium waves in a cardiomyocyte syncytium. Our system provides a compact and easy to use platform for optogenetic stimulation of various cardiac models.
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