gne_577
Junior Member level 3
Hello ,
I'm Working on Industrial Project based on PIC18F series micro-controller. I'm using TQFP packaging pic18f97j60 controller. In this project i used some modules such as PWM for AC motor control . LCD , 4x4 Keypad , I2C for external EEPROM , L297-L298 and TIP122 for relays & Solenoids of 24v DC
I'm using two Omron +24VDC 4 A ( For microntroller & TIP122 ) and +12VDC 4A ( For Stepper Motors) Professional power Supply for whole panel and further i used two 7805 for voltage converter. I just make sure that there is fully isolation between Inputs / Outputs operations by using optocoupler EL817. Only LCD and 4x4 Keyboard is directly coupled to uC.
My question is that is it necessary to use different power supplies for load and Micro controller to eliminate noises and hang type problem. Because i find that there are blocks appeared on lcd some type and whole data is disappeared.
Is this due to single power supply..? or i have to give full isolation to ground and vcc both. If yes then please suggest me circuit or any idea.
Thanks in advance.
I'm Working on Industrial Project based on PIC18F series micro-controller. I'm using TQFP packaging pic18f97j60 controller. In this project i used some modules such as PWM for AC motor control . LCD , 4x4 Keypad , I2C for external EEPROM , L297-L298 and TIP122 for relays & Solenoids of 24v DC
I'm using two Omron +24VDC 4 A ( For microntroller & TIP122 ) and +12VDC 4A ( For Stepper Motors) Professional power Supply for whole panel and further i used two 7805 for voltage converter. I just make sure that there is fully isolation between Inputs / Outputs operations by using optocoupler EL817. Only LCD and 4x4 Keyboard is directly coupled to uC.
My question is that is it necessary to use different power supplies for load and Micro controller to eliminate noises and hang type problem. Because i find that there are blocks appeared on lcd some type and whole data is disappeared.
Is this due to single power supply..? or i have to give full isolation to ground and vcc both. If yes then please suggest me circuit or any idea.
Thanks in advance.