I am controlling a relay hat from a pico (https://github.com/sbcshop/Pico-Single- ... %201CH.pdf).
Due to this relay only being rated at 10A 30V DC, I am then using this to switch a second 12V automotive relay to trigger a horn.
When there is no load on the second horn relay, my code runs without issue and both relays latch and unlatch without issue.
When a load is applied on the second 12v horn relay, the pico then crashes.
I would welcome some support in where my rather rusty electronics knowledge is failing me.
The relay hat being used has a transistor and diode between the GPIO and the relay such that the pico should be protected.
Here is a simplified circuit diagramI have also disconnected the Pico from the Buck and am now running it from an isolated USB power source to ensure there is no voltage drop.
As the horn is a car snail horn it does mean that there is emi noise being produced, however I would expect the relay hat to protect the pico from this.
Many thanks in anticipation.
Paul
Due to this relay only being rated at 10A 30V DC, I am then using this to switch a second 12V automotive relay to trigger a horn.
When there is no load on the second horn relay, my code runs without issue and both relays latch and unlatch without issue.
When a load is applied on the second 12v horn relay, the pico then crashes.
I would welcome some support in where my rather rusty electronics knowledge is failing me.
The relay hat being used has a transistor and diode between the GPIO and the relay such that the pico should be protected.
Here is a simplified circuit diagram
As the horn is a car snail horn it does mean that there is emi noise being produced, however I would expect the relay hat to protect the pico from this.
Many thanks in anticipation.
Paul
Statistics: Posted by probso — Mon Apr 15, 2024 5:12 pm