HI, I am using GSM module, Ethernet, 8 relays to switch AC load, smoke detector, vibration sensor and three input switches in this i am facing some problems as i have seen this it shows unexpected values on LCD Display, so i check for noise spikes in power supply so i am getting it over their but after adding Filter and capacitors it still their even we have used transistor to switch relays....... please help me to solve this

 

One thread is enough.

Use this:

http://forum.allaboutcircuits.com/t...value-problem-interfaced-with-lpc2387.103003/