i have a project that activate an ac fan when the temperature is 25 c or above and there is a light in the room
i tried to design a circuit which consist of heat sensor and light sensor and AND gate and Relay
when i drew heat sensor circuit and simulate it in multisim and used an oscilloscope it give 4.950 v when on and 36.508 mv when it is supposed to be off
and the same in light sensor
when i added them to an AND gate and the two sensors is on it gives exactly 5v
when one is off and one is on it gives also 5v
i attached the three circuits via multisim
http://rapidshare.com/files/250333500/circuit.rar
thank u in advance
i tried to design a circuit which consist of heat sensor and light sensor and AND gate and Relay
when i drew heat sensor circuit and simulate it in multisim and used an oscilloscope it give 4.950 v when on and 36.508 mv when it is supposed to be off
and the same in light sensor
when i added them to an AND gate and the two sensors is on it gives exactly 5v
when one is off and one is on it gives also 5v
i attached the three circuits via multisim
http://rapidshare.com/files/250333500/circuit.rar
thank u in advance