Yeah i am aware of it. As the nodemcu doesn’t fit on these bread board i usually buy he ESP12E chip and solder it to a breakout board. And i have my lab bench power supply to feed ESP.
I will definitely checkout !! Thank you for the link.
Вариант 1. Сдвиговый регистр. Вариант 2. Использовать UART ESP и на отдельном микроконтроллере реализовать расширение. Вариант 3. Использовать ESP32
I’m using MCP23017 expander to have more inputs/outputs for my NodeMCU.
It have 16 I/O ports and i2c. Im using 8 ports as inputs for logic current sensors (for light on/off state) and 8 ports as outputs to control relays via ULN2803 transistor array to turn on/off lights.
If needed, the setup can be extended to more MCP23017 and ULN2803 .
ULN2803 used to reduce part amount on board. No diodes needed for relay switching
Controlling inputs/outputs for MCP23017 is very easy
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MCP23017 is best use for 16 ch input or output.
For relay for loking for 16 ch relay board gor 5v.
Search on google for board.