updated
dear coonection
i am in IOT(internet of things) project.its mainly focusing control the light and fan.in my project fan speed control feature also included.
from above block i am only shown fan connection side.
here fan speed can control through manual regulator or via internet(micro controller side). via internet it connect to automode .in manual mode fan speed is control through a fan regulator.
auto or manual mode select by detect the human presence using a PIR sensor(as shown) . its work well .
but now we just want to replacing PIR sensor because device may place where the detection is not possible ,on that case fan speed cannot control simultaneously via manual regulator or internet.
what modification i made in circuit to work both auto or manual mode(when PIR sensor is removed)??
