Nodemcu Logic Level Shifter. If you were to connect them directly data sent from the nodemcu to the uno might have too much noise to be read as 3 3v is quite close to the minimum voltage required for a logic high. I have used hx711 and loadcell with nodemcu esp8266 in its d1 and d2 pins here i have used logic level shifter and a 5v supply to power hx711 it worked perfectly fine.
The 5v to 3 3v works fine and i can transmit data from the uno to the esp. Just a quick video on how to use a logic level converter to connect 3 3v modules safely to an arduino follow us on facebook and twitter to get notified when. If i set the brightness the glitches don t appear all other glitches are with full brigthness.
It is a device called a bi directional logic level shifter and they can be bought for about 30c delivered.
Level shifters are used to enable communication between devices operating at different logic levels voltages. I ve tried building the 3v to 5v in the diagram and its not working. It can t supply the relays 70 ma operation current each and isn t required by the relays module logic input which accepts 3 3v level according to specification. Level shifters are used to enable communication between devices operating at different logic levels voltages.
