ESP8266 Community Forum

- Sat Jan 17, 2015 3:13 am #7489 See this:

http://iot-playground.com/2-uncategorised/17-esp8266-wifi-module-and-5v-arduino-connection

EasyIoT framework http://iot-playground.com/

- Sat Jan 17, 2015 3:26 am #7490 Thanks. Tried that circuit already. No luck. I've ordered a 4050 and will try that. Otherwise I currently have the ESP TX and Arduino RX directly connected and its been running fine for a day so might just leave it like that. As a previous poster said so chance of overvoltage on the Arduino pins as the ESP is 3.3v

- Thu Jan 29, 2015 6:05 am #8443 Strangely enough, no combination of resistor dividers worked for me... might have been my 3 volt supply, so I decided on a simple diode resistor option below...
The RX on the Arduino is set to an input so in theory it can be connected directly to the ESP TX but I did add a resistor just in case spiked at power up...

2015-01-29_104603.jpg

The 4050 operated at 3.3 volts is another good option for testing and you can always use the other gates for buffers and the like...

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- Thu Jan 29, 2015 7:44 am #8450 http://www.semiconductors.philips.com/a ... n97055.pdf describes a MOSFET solution that is probably the most popular. The app note specifies a BSS138 transistor but either 2N7000 or 2N7002 (SMD version) will work. This is the design used in the http://www.adafruit.com/product/757 ($3.95, I have one of these and it works well), https://www.sparkfun.com/products/12009 ($2.95) and https://www.pololu.com/product/2595/resources ($2.50) boards. If you want to solder your own, there is also an OSH Park project https://oshpark.com/projects/UVLYN7J9 ($1.20 for 3 boards).