Arduino sending data to ESP8266 (Not using AT commands)?

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i've had lot of success using esp8266 , programming via ardiuno ide simple tasks reading temperatures ds18b20 , sending local web server.

for next project need more pins rsp8266 offers. need multiple inputs, pwm, , adc. perfect arduino uno. still need send data via esp8266 web server.

i've seen lots of posts on connecting , sending data serially esp past experience i've never had luck on , found unstable.

is other methods can in getting arduino uno send data esp?

i2c, if serial hard, i2c no easier.  have used software serial data uno esp , found not dificult , reiable.  i2c well.   serial input basics might reliable comms going. need level shifting between uno tx (5v) , esp rx (3.3v).  have used resistor voltage divider successfully.


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