scorrpeio
Full Member level 5
This is need based project...
Need:-
1. I have a relay which will connect the water heater to AC mains.
2. The relay should be on for 15 min i.e. heater will be on for 15 min.
3. After 15min the relay should disconnect heater from ac mains. Also, it should play a buzzer as an indication that heater is disconnected.
Solution:-
The solution I got, is to use a timer which will be ON for 15 min and then OFF till it gets next trigger.
I thought to use IC LM7555 in monostable mode. But the ic costs $3.5 :sad:
Now, I am hopeful that I will get a microcontroller in range of $1 which can serve my purpose. Further, the mc will make the timer flexible enough. :idea:
Can anyone tell me, if I am thinking in right direction? What will be the cost effective solution for the above problem? If it is mc, which mc will be cheapest and serve the purpose? :?
Need:-
1. I have a relay which will connect the water heater to AC mains.
2. The relay should be on for 15 min i.e. heater will be on for 15 min.
3. After 15min the relay should disconnect heater from ac mains. Also, it should play a buzzer as an indication that heater is disconnected.
Solution:-
The solution I got, is to use a timer which will be ON for 15 min and then OFF till it gets next trigger.
I thought to use IC LM7555 in monostable mode. But the ic costs $3.5 :sad:
Now, I am hopeful that I will get a microcontroller in range of $1 which can serve my purpose. Further, the mc will make the timer flexible enough. :idea:
Can anyone tell me, if I am thinking in right direction? What will be the cost effective solution for the above problem? If it is mc, which mc will be cheapest and serve the purpose? :?