mortuzahasan
Newbie level 2
Hi All,
I am designing a microcontroller based home automation which will derive 10-16 12V 5A relay through RF transceivers. i am using ULN2804 to drive the relays. in the contact side the relay would drive loads like ceiling Fans, lights and other home appliences for long periods. what sort of EMI protection should i have on the circuit. As ULN2804 has built in clamp diode, in was thinking to put a 220uF cap across the relay coil. what sort of snubber on the load side shall i connect? what would be the R-C value for the snubber and how to connect them (e.g parallel with switch). please help me.
*** By mistake posted in Microcontroller Forum in previous. Apology for any inconvenience
I am designing a microcontroller based home automation which will derive 10-16 12V 5A relay through RF transceivers. i am using ULN2804 to drive the relays. in the contact side the relay would drive loads like ceiling Fans, lights and other home appliences for long periods. what sort of EMI protection should i have on the circuit. As ULN2804 has built in clamp diode, in was thinking to put a 220uF cap across the relay coil. what sort of snubber on the load side shall i connect? what would be the R-C value for the snubber and how to connect them (e.g parallel with switch). please help me.
*** By mistake posted in Microcontroller Forum in previous. Apology for any inconvenience