Thursday, 7 May 2015

transistors - Arduino crashes switching 230V relay OFF


Here is my circuit schematic : enter image description here


I need to power ON/OFF a 230VAC fan using a relay. The relay is powered by a 5V DC power supply. Digital pin on the Arduino board open or close the circuit in PNP as it is HIGH or LOW; If it's HIGH, the relay is switched ON, otherwise it is OFF. There is also a snubber diode to avoid current from relay induction.


The digital pin is controlled by RX message.


This is working very well when 230V AC is powered OFF, but when it'is ON the Arduino crashes, and gets unable to receive RX messages.


I think something is wrong in my circuit. Can you help me please?


Edit


Here is my new schematic : I've removed the transistor and the snubber diode The digital pin is directly linked to the command pin on the relay with 2.2k resistor and a simple led


enter image description here



RX/TX is still crashing, and the arduino seems to act very slowly




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