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you can use current transformer for current sencing in microcontroller you can program the value on which you want to over load.
or you can connect over-current relay with it has switch N.O(normally open) and N.C (NORMALLY CLOSE) YOU CAN USE These
switch for over over load
hi,
first you have knowledge about spi interface
then u choos microcontroller i like atmega16 it has spi interface
you have to read mcp2515 manual you also interface mcp2551 with mcp2515 through pin rx_can(pin 2) and tx_can(pin1) to mcp2551's pin 4(rxd) and pin 1(txd)
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