to increase channel numbers you could add a "I2C" expander.
There are different types and different numbers of channels. (PCF8574, MCP23017, ecc....)
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Dear Team I'm your customer and I'm trying to use "Pzem 004t energy module" with MAXI . this works only on the pin headers of serial 2 (RX2;TX2 pin 17 and 16). I tried on serial 1 or with a soft serial on the other pins but with a negative result. could you tell me which pins to try? ie on which pin...