These are chat archives for esp8266/Arduino

27th
Jun 2017
brutzler
@brutzler
Jun 27 2017 20:44
Hi,
using a 5V-serial-signal on the RX-Pin of a Wemos D1, I use a voltage-divider 1,8k/3,3k to get the level at 3,3V. On the Oszi I can see, that the receiving data (going into the voltage divider) are with 5V-level.
But measuring at the RX-Pin, I only have 1V-level???
Hmmm... Ohms law tells me something different....
Without voltage divider, all is working fine, but 5V at a ESP-Pin??? Not good for long time, IMHO
Perhaps I use instead of the voltage divider 2 diodes in row, to loose ~1,4V at the diodes?
What do you think?