I use a ESP-12E, where all the pins are broken out and nothing is connected on the board itself.
Online I found different ways to connect the pins GPIO16 and RST (RESET) to allow automatic wake-up from deep sleep:
- direct connection (https://jeelabs.org/book/1526b/ and https://www.losant.com/blog/making-the-esp8266-low-powered-with-deep-sleep)
- low-pass filter with capacitor between the pins and resistor between RST and Vcc (https://www.letscontrolit.com/forum/viewtopic.php?t=2320)
I also found someone using CH_PD ("EN") pin instead of RST, but I see it's not the preferred way.
What are the differences between the two alternatives I listed?