Relay selection

[igurgo]

if use 24v relay, let your A64 board and Vin terminal all connect with 24v dc power supply.

The voltage of the digital output without load is 22.4V.
When the relay is connected, the voltage is 8v.
If you pull the SSR out of the relay, the voltage is 12.7V.
At the same time, with a load, the LED of the digital output always lights up, and the relay does not click.
Separately, the relay works if the voltage is supplied directly from the same power supply (24v, 4A).