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Chris
Chris
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I know it is rather late to respond. What worked for me working with a WEMOS D1 mini and the MH-Z19C was reassigning the Software Pins used SoftwareSerial co2Serial(D1, D2); In that case the second sketch posted works atleast for me.

The problem might be that the ESP8266 uses the hardware serial lines for connection to the USB-to-Serial bridge (usually a CH340 or CP2102 in most designs) which means you might encounter problems if you want to use the same serial line for more than one device.

I know it is rather late to respond. What worked for me working with a WEMOS D1 and the MH-Z19C was reassigning the Software Pins used SoftwareSerial co2Serial(D1, D2); In that case the second sketch posted works atleast for me.

The problem might be that the ESP8266 uses the hardware serial lines for connection to the USB-to-Serial bridge (usually a CH340 or CP2102 in most designs) which means you might encounter problems if you want to use the same serial line for more than one device.

I know it is rather late to respond. What worked for me working with a WEMOS D1 mini and the MH-Z19C was reassigning the Software Pins used SoftwareSerial co2Serial(D1, D2); In that case the second sketch posted works atleast for me.

The problem might be that the ESP8266 uses the hardware serial lines for connection to the USB-to-Serial bridge (usually a CH340 or CP2102 in most designs) which means you might encounter problems if you want to use the same serial line for more than one device.

Source Link
Chris
Chris
  • 11
  • 3

I know it is rather late to respond. What worked for me working with a WEMOS D1 and the MH-Z19C was reassigning the Software Pins used SoftwareSerial co2Serial(D1, D2); In that case the second sketch posted works atleast for me.

The problem might be that the ESP8266 uses the hardware serial lines for connection to the USB-to-Serial bridge (usually a CH340 or CP2102 in most designs) which means you might encounter problems if you want to use the same serial line for more than one device.