ESP8266 Community Forum

I have SparkFun ESP8266 Thing, MLX90614 evaluation board, and FTDI board and I'm trying to send IR thermometer data through Wifi. I followed the instructions on SparkFun website and I was able to get temperature reading when I use MLX90614 evaluation board directly connected to FTDI. But when I connect MLX90614 to ESP8266 I don't get any temperature through serial monitor. I'm using the example sketch that comes with MLX90614. I have tried these two different wiring:

ESP8266 -> MLX90614
SDA -> SDA
SCL -> SCL
GND -> GND
3.3V -> 3.3 V

ESP8266 -> MLX90614
GND -> GND
3.3V -> 3.3 V
TXO -> TX
RXI -> RX

Any suggestions is appreciated. Thanks.