marifhossain
Newbie level 4
microcontroller hang
I use microcontrollers for a long time in low voltage (instrumentation and display) applications. But when I tried to make a washing machine controller, I was in a real problem. The microcontroller operartes some small relays to drive some 220 volt operated devices of the machine e.g. pump, heater, door lock, motor etc. but I found that one of the major problems in the high voltage application was Microcontroller "Hang-out"!. While operating resistive loads like heater it works fine but when starting the motor of the machine causes heavy spark on the relay contact and hangs the microcontroller. I tried capacitors accross the relay contacts and it reduced the number of hangout but not completely.
Why microcontrollers hangs in high voltage applications and how to eliminate them? I believe noise. But how to reduce the noise in microcontroller based applications used in power line applications I would like to know.
Does anyone have good documentations like "How to use Microcontrollers in the Noisiest Place of the universe without hang-out!!" ??
I also belive that the power supply of the microcontroller is one of the reasons for that.
Professionals are welcome to reply at arif@delectrol.com or marifhossain@yahoo.com
I use microcontrollers for a long time in low voltage (instrumentation and display) applications. But when I tried to make a washing machine controller, I was in a real problem. The microcontroller operartes some small relays to drive some 220 volt operated devices of the machine e.g. pump, heater, door lock, motor etc. but I found that one of the major problems in the high voltage application was Microcontroller "Hang-out"!. While operating resistive loads like heater it works fine but when starting the motor of the machine causes heavy spark on the relay contact and hangs the microcontroller. I tried capacitors accross the relay contacts and it reduced the number of hangout but not completely.
Why microcontrollers hangs in high voltage applications and how to eliminate them? I believe noise. But how to reduce the noise in microcontroller based applications used in power line applications I would like to know.
Does anyone have good documentations like "How to use Microcontrollers in the Noisiest Place of the universe without hang-out!!" ??
I also belive that the power supply of the microcontroller is one of the reasons for that.
Professionals are welcome to reply at arif@delectrol.com or marifhossain@yahoo.com
