This is my first entry altogether. I already have a working prototype of the project but there are a few problems with the thing:
- The ESP-12E does boot up very erratically
- The SPI communication used does not allow to reach all the data (just the first 64 words out of around 200), switch to the I2C is needed
- I believe that the device is not safe from the voltage spike, because there is not enough creepage distance from mains to the ground near the linear transformer primary; also it probably lacks TVS diode
- The relay is not switched with the MAX78615 zero/crossing in-built switch, just with the ESP GPIO, but the relay could be removed altogether
I would greatly appreciate any comments regarding the European grid mains safety to implement them in the second iteration of the PCB. Thank You.