Back after long break

It's good to come back after long break.

Now I need to figure out what type of board I am using form my project!
First trying were wrong
Looks like it is DOIT ESP32 DEVKIT V1

I also learn that one of my RFID readers stops working... who know why. Possible work of some alien civilization trying to stop me from finding something :O

Looking into energy consumption

RC522 Features

  • 13.56MHz RFID module
  • Operating voltage: 2.5V to 3.3V
  • Communication : SPI, I2C protocol, UART
  • Maximum Data Rate: 10Mbps
  • Read Range: 5cm
  • Current Consumption: 13-26mA
  • Power down mode consumption: 10uA (min)

here some nice advice about RFID and power saving
Hello,
I have a very important decision to take based in the wake up from deep sleep.
If ESP32, or ESP8266 can wake up from deep slep based on RX pin status, then i use ESP. If not i have to use a regular transceiver.
What is all about. I have an RFID reader connected to an NodeMcu – ESP8266 RX pin.
When i read a card, i send the numbers of the card to a second ESP.
I must use Deep sleep for ESP board as it is powered by batteries. I must wake up the ESP only when i do a read with the RFID reader, and this transmit the ID of the card to ESP RX pin.
Between that, full deep sleep. I do not need RTC, no Wifi, no nothing. Just the ESP sleeping.
Please help me on this.
Thank you

Hi Ion.
The ESP32 can only woke up from deep sleep using RTC pins.
The UART pins don’t have RTC properties.
So, these are not able to wake up the ESP32.
However, if you use light sleep, you can use any GPIO, but it won’t save as much energy.

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