in pdf there is one more page there is all relays and other dimmer related components+
i use external 5v 700mamp power supply also one power supply is built in but for now i'm using external one for fault finding
no i not check rx/tx but it's working at start and also work fine on breadboard so there is no issue i have problem with pcb or maybe pcb design itself or maybe crystal issue i try different value cap. but same result every time
no there is no back emf diode but in diagnosis i use external relay through header pin with external relay module board but still result same
all i have in circuit issue no power problem no shorting no gnd missing no power missing nothing there is one gnd missing in pcb design but i fix it if i use without any load there is no issue problem faces when load connected to any of terminal/s