Hello, i am wondering how can this board have that many relays controlled by one esp since it doesn t have that many gpio pins that are boot safe and what would be the overall curent draw from the gpio pins of the esp, into the transistors base isn t the limit exceded? Is this board safe and it won t run hot when they are powered all at the same time?
I intend to use it for light buls control, small curent draw around 100w each
I would suggest that you use a MCP23008 I2C IO expander chip. That way you only use the 2 I2C pins to control the 8 outputs. There is also the MCP23S08 that has the SPI interface and the MCP23017 and MCP23S17 that are I2C or SPI interface with 16 GPIO pins.
Another option is a shift register like the 74HC595 or one of the higher output current derivatives. They use a SPI or bit bang synchronous serial (shiftOut() function) interface.
It depends on what you use the pins for!
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