If using Arduino IDE v2, the USB cable must be connected to your MCU. If not you may not see your port. IDE v1 does not care if USB is connected or not. That has been my experience. Perhaps this will help you.

Update! I will be allowed to update my code to the pump house enclosure HUZZAH32 MCU tomorrow afternoon sometime. I have added a restart function that will send me a text when the ESP32 is restarted. The restart time is 2400 so will see the text at 0800 or so. I will report back after it has been on...

@MicroController Thank you VERY MUCH for your in-depth response to my query. Today's research has made me wonder if I am using the right MCU for this project (which is embarrassing me because I cannot solve this hanging issue). That said your final suggestion may resolve this problem altogether. I w...

I have an Adafruit HUZZAH32 ESP32 MCU that gathers the following data from a domestic water tank: water level, temperature, humidity and LiPo battery voltage. This data is printed to a 16x2 LCD. It also sends daily texts three times a day and if the water level drops below eight (8) feet, it sends a...

This is my exact hookup.

Thanks.

After updating/installing: Arduino ESP32 Boards to v2.0.13 and esp32 by Espressif Systems v3.0.4 I cannot get a simple 16x2 LCD to work as it once did. The sketch is one I have used several times in the past. Board used: ESP32-WROOM-32 I2C connections are: SDA->GPIO#21, SCL->GPIO#22 When power and G...

OK I used an UNO to retest these same 2-channel SSR's and got the same exact behavior with this 5V logic HIGH board. I am not an UNO fan but they are good for testing purposes when 5V logic is required. The UNO GPIO pin voltages are: 5.219V (HIGH) and 5.8 mV (LOW). According to the spec sheet these ...

I was concerned about that as well but the other relay's work with the 3.3V logic input from the ESP board without issue.

I could try boosting the pin logic to 5V but that means more hardware in my enclosure. However, if this works it will have solved this puzzle.

Thanks for your post.

I was hoping to save some room in my project enclosure by using a 2-channel SSR instead of using two 1-channel SSR's. However, no matter what I try, the 2-channel SSR's will just not work. I have tried two of these 2-channel SSR's and get identical behavior from both. The relay ignores my sketch cod...

@liaifat85

Thank you for your response to my query. I will try what you have suggested and report back.

Thanks again for your help.