2020-11-18, 03:11 PM
(This post was last modified: 2020-11-18, 03:48 PM by Blue Ocean.)
(2020-11-18, 03:56 AM)Techstyle Wrote: Just a couple of updates:
1. The 'NC' port on the Relay, should actually be the 'NO' port
2. The LED/resistor between pin 40 and the 3.3v board ground doesn't trip everytime, as the voltage only drops to 1.25v. therefore, I have paralleled (or you can replace) this with a 1k resistor, shutsdown in <5 seconds then
Thanks for the updates. I already wondered about the NC/NO.
I won't be using a LED at all, but for a pull-down a 10K would suffice I think. Also the value of the resistor should not influence the time needed for the shutdown. But that is probably what you meant.
Just noticed that the relay-module needs a minimum of 5V
Have you experienced any problem feeding it with just 3.3V?
Edit:
The 5V relay-module pulls 100mA.
The 3.3V version pulls 160 mA.
Should be fine as the 3.3V regulator can go up to 1.5A but the 5V supply must be able to deliver this extra load.