I am trying to connect to esp8266 using Arduino UNO. There are various things on the internet having mixed information and hence I am seeking some clarity.
I followed these instructions, but could not get to connect to ESP8266 using AT command. http://cordobo.com/2300-flash-esp8266-01-with-arduino-uno/
I have following questions:
- Can I connect ESP8266 directly to Tx/Rx without voltage divider or level shifter? I also suspect that the voltage divider connections are wrong. As per my understanding, the Tx from Arduino should be divided, and the divider output should be connected to ESP8266.
- When I connected the shield as described, the shield gets hot. Is there any way to conclude if the shield is damaged or not?
- When I connect the device using voltage divider the blue LED on the shield also lights up. Without divider, it does not light up. What is the significance of the blue LED?
Circuit using voltage divider
Circuit without voltage divider