I’m struck at a point in my home automation project.
I’m using 4 channel 433MHz receiver and transmitter remote for controlling 4 channel relay board.
4 outputs of rf receiver are directly given to 4 inputs of 4 channel relay board. Both are given common dc 5v power supply.
The problem is, when I start the dc power supply to system, all relays are triggered once automatically without pressing any key on rf remote.
What could be going wrong? Any idea?
( I am thinking on using some pull down or pullup resistors before relays)Anyone please suggest.
( Exactly same problem is arising with pir sensor also)