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Raspberry pi zero

patil.sunny9999

Hello There,

Please help me out. I am using Raspbeery Pi zero and Raspberry pi Zero W. Currently I am working on Serial Transmission on it. First the Serial Transmission was working well on raspberry pi zero. but all of a sudden it stops receiving data.so i checked the TTL voltage level , on RX pin it showing only 0.35 volts. As i checked more i got to know that my RX pin and Ground are shorted. What should i do now ? please suggest.

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  • Sir, I have Connected TX, RX pins to RS232 IC setup along with USB to RS232 converter cable. Raspberry pi itself supplying the voltages to drive serial signal.

  • in reply to patil.sunny9999

    So what you're saying is that you have an USB-RS232 converter that allows you to set the IO voltages on the non-USB  side(*). And you're saying that you used a voltage output from the pi to set the IO voltage.

    Now the question remains: did you use 3.3V or 5V? (3.3V is pin 1 on P1, 5V is pin 2 and pin 4 on P1).

     

    (*) if the signal levels are not -12V for "1" and +12V for "0" then you can't really call it RS232.

  • in reply to rew

    Sir, my RS232 Chip circuit is well Tested and Signal Levels are also as per Required.

     

    As i mentioned before that my serial Transmission was working well on my Raspberry pi zero.

     

    All of a sudden something happened and raspberry is now only Transmitting the Data but not receiving it.

     

    And also 5V supply voltage RS232 chip is given from Raspberry pi VCC (Physical pin no. 2).

  • in reply to patil.sunny9999

    Sir, The raspberry pi foundation has not released full formal electrical specifications for the chip. But they have said: if you supply 5V signals into the raspberry pi CPU, the chip will have a reduced lifetime.

     

    I have in the past accidentally supplied 5V signals into the raspberry pi. I have then noticed that and quickly disconnected what shouldn't have been connected in the first place. So far this has not resulted in my raspberry pi breaking down.

     

    You have confirmed to me that you're sending 5V signals into the raspberry pi.

    You have confirmed to me that you've tested this for a while.

    The foundation says that it won't die immediately. My experience confirms that.

    The foundation says that it will die quicker than when you provide appropriate 3.3V signals. Your experience confirms that.

     

    Sir, you have, by your own actions, blown up your raspberry pi.

    The good news is that it's only one pin. The bad news is probably that you NEED that pin for your project. Sorry about that.

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  • in reply to patil.sunny9999

    Sir, The raspberry pi foundation has not released full formal electrical specifications for the chip. But they have said: if you supply 5V signals into the raspberry pi CPU, the chip will have a reduced lifetime.

     

    I have in the past accidentally supplied 5V signals into the raspberry pi. I have then noticed that and quickly disconnected what shouldn't have been connected in the first place. So far this has not resulted in my raspberry pi breaking down.

     

    You have confirmed to me that you're sending 5V signals into the raspberry pi.

    You have confirmed to me that you've tested this for a while.

    The foundation says that it won't die immediately. My experience confirms that.

    The foundation says that it will die quicker than when you provide appropriate 3.3V signals. Your experience confirms that.

     

    Sir, you have, by your own actions, blown up your raspberry pi.

    The good news is that it's only one pin. The bad news is probably that you NEED that pin for your project. Sorry about that.

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