Hello everybody,
I am using PIC18F452 to doing timing and displaying 7 segment LEDs, it is being to be located in a very hostile
condition. Since it needs to position a something like welder, its position to be displayed on LEDs. Wherever the
welder makes contacting, sparkings' noise-electromagnetic or RF etc. disorder the normal operation of positioning and
displaying data. Even the program which is stored in MCU are corrupted and needs re-programming.
After making all metal enclosure for all PC board and all external cables are shielded with going to earth. The problem
improved a lot with no obivous apparent disorders. However, the displayed data are not correct.
The MCU operates at 40MHz, together with using of 555 to sending some around 20KHz PWM pulse of 80VDC to the welder.
Does anybody have recommendation how I can solve it?
Thanks in advance.
I am using PIC18F452 to doing timing and displaying 7 segment LEDs, it is being to be located in a very hostile
condition. Since it needs to position a something like welder, its position to be displayed on LEDs. Wherever the
welder makes contacting, sparkings' noise-electromagnetic or RF etc. disorder the normal operation of positioning and
displaying data. Even the program which is stored in MCU are corrupted and needs re-programming.
After making all metal enclosure for all PC board and all external cables are shielded with going to earth. The problem
improved a lot with no obivous apparent disorders. However, the displayed data are not correct.
The MCU operates at 40MHz, together with using of 555 to sending some around 20KHz PWM pulse of 80VDC to the welder.
Does anybody have recommendation how I can solve it?
Thanks in advance.