mohammadh150

ok problem solved..need to add 10k ohm pulldown resistor

yes i had follow the schematic..just change from nano to pro mini.. i also change the code as your picture but the result is still same.. i use code for no display out. when i slot the jumper wire to the pin 2, the relay will trigger by it self..when i pull out the jumper wire from the pin 2 it will stop trigger..

iam using arduino pro mini.. the code is still the same as your code.. i have test with normal relay SRA-05VDC-CL relay also tried with relay module and the result still the same... the relay will trigger when i put jumper wire into the digital pin 2... please help

Do you mean that don't use that low level relay? What if i just use normal relay?

hi..why when i complete the circuit, the relay keep switch on it self..??