Hi,
I am currnetly working on PIC microcontroller based automated meters. I am using PIC16F76 (SOIC) to display values on 7-seg display units, 6 numbers, 5Volts, Common cathode. I have two issues.
1. The display unit is at 2 metres approx from the PIC board. I use ULN in PIC board, which is used to ground the 7-seg common cathode pins. The PORTB of PIC is directly used to connect the data pins of 7-seg. Can I connect the PORT pins of PIC to directly connect 7-seg load placed at 2 meters? Will it cause any issue? Or should there be a driver (transistor) at the microcontroller end for 7-seg anode nodes also? Recently I got my PIC IC suddently got burnt off, though it was working fine initially for 15 days. Any inputs please...
2. I have 220-15V 1amp transformer placed close to PIC board, supplying power to the board. Will it cause any issue through EMI or something? Is it safe to have the transformer close to PIC board?
Divakar Raj. R
I am currnetly working on PIC microcontroller based automated meters. I am using PIC16F76 (SOIC) to display values on 7-seg display units, 6 numbers, 5Volts, Common cathode. I have two issues.
1. The display unit is at 2 metres approx from the PIC board. I use ULN in PIC board, which is used to ground the 7-seg common cathode pins. The PORTB of PIC is directly used to connect the data pins of 7-seg. Can I connect the PORT pins of PIC to directly connect 7-seg load placed at 2 meters? Will it cause any issue? Or should there be a driver (transistor) at the microcontroller end for 7-seg anode nodes also? Recently I got my PIC IC suddently got burnt off, though it was working fine initially for 15 days. Any inputs please...
2. I have 220-15V 1amp transformer placed close to PIC board, supplying power to the board. Will it cause any issue through EMI or something? Is it safe to have the transformer close to PIC board?
Divakar Raj. R