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STM32F401 how to increase/decrease light density? Should work as a heartbeat

Question asked by Krasimir Yordanov on May 24, 2017
Latest reply on May 24, 2017 by waclawek.jan

Hello. We are trying to set a pin's light to increase and decrease progressively, should work as a heartbeat. Could you please tell us how we could do this? We've searched a few hours already, but could not find anything useful. Where should we look? what should we modify? thank you very much!