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I have connected a MAX232 chip for RS232 communication with my Arduino. The chip input is connected to Arduino Tx and it is getting power from external 3.3 volt dc power source.

My Arduino is also getting power from 12 volt DC external power source.

While I connect and start the device, the PC is not getting any data until I reboot the MAX232.

How do I make a robust setup so that after I turn the powers on, it starts transmitting. Even if connection to my PC has been lost.

sa_leinad
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Moithil Biswas
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1 Answers1

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Datasheet for MAX232

Section 7.3 Recommended Operating Conditions VCC Supply voltage

MIN=4.5, NOM=5, MAX=5.5 (V)

The MAX232 has a minimum supply voltage of 4.5V, typically expecting 5V.

There are other alternatives, such as the MAX3232, which supports either 3.3V or 5V supply voltage.

jose can u c
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