Doesn't example wiring ignore the fact that arduino is 5V, and ESP8266 is not 5V tolerant?

[CptanPanic]

I have been having problems getting espduino to work reliably with my arduino and esp, and then I just realized that the max input voltages on the ESP are only 3.6V, and the arduino is 5V. Shouldn't your example drawing state that you should use a 3.3V arduino, or you need level shifters?

[tuanpmt]

yes, you must use level shifters for 5V arduino

[Namphibian]

Tuan uses a logic level shifter in his diagram. The logic level shifter uses BS1338 MOSFETS to drive signals bi-directionally between esp and arduino. Tuan can we close this isse it is just adding noise.