OpenSprinkler › Forums › Hardware Questions › OpenSprinkler › PCA9555 issues with homebuilt OS Latch › Reply To: PCA9555 issues with homebuilt OS Latch
July 12, 2020 at 7:51 pm #67290
Hi Ray, thanks for the rapid response. Yeah, according to the datasheet, when the PCA9555 undergoes a power-on reset, all GPIO are set to input, which is what I think is happening. But I’m not sure why it is happening. I think, when the OS is rebooted, all the necessary PCA9555 initialization steps take place again, which is why it recovers.