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winny
winny
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Do I need a bidirectional logic shifter for uartUART

I need to interface my raspberry piRaspberry Pi to my unoUno hence I need to logic shift 5v5 V logic to 3.3v3 V. I will be sending data from the unoUno to piPi and from the piPi to the unoUno. My understanding is uartUART uses two pins one for sending and one for receiving. I have built myself one of these

enter image description here

I have only built myself one of these because I wasn't confident I can build it. I was expecting it would blow up or won't work. Anyway I was wondering do I need two of the above. Can I get anyway with just two of the following?

enter image description here

It would be very handy if I can because then I dontdon't have to use more transistors and it's my understanding the first circuit is essentially the second circuit doubled up.

Do I need a bidirectional logic shifter for uart

I need to interface my raspberry pi to my uno hence I need to logic shift 5v logic to 3.3v. I will be sending data from the uno to pi and from the pi to the uno. My understanding is uart uses two pins one for sending and one for receiving. I have built myself one of these

enter image description here

I have only built myself one of these because I wasn't confident I can build it. I was expecting it would blow up or won't work. Anyway I was wondering do I need two of the above. Can I get anyway with just two of the following?

enter image description here

It would be very handy if I can because then I dont have to use more transistors and it's my understanding the first circuit is essentially the second circuit doubled up.

Do I need a bidirectional logic shifter for UART

I need to interface my Raspberry Pi to my Uno hence I need to logic shift 5 V logic to 3.3 V. I will be sending data from the Uno to Pi and from the Pi to the Uno. My understanding is UART uses two pins one for sending and one for receiving. I have built myself one of these

enter image description here

I have only built myself one of these because I wasn't confident I can build it. I was expecting it would blow up or won't work. Anyway I was wondering do I need two of the above. Can I get anyway with just two of the following?

enter image description here

It would be very handy if I can because then I don't have to use more transistors and it's my understanding the first circuit is essentially the second circuit doubled up.

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Ageis
Ageis
  • 3.4k
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  • 67

Do I need a bidirectional logic shifter for uart

I need to interface my raspberry pi to my uno hence I need to logic shift 5v logic to 3.3v. I will be sending data from the uno to pi and from the pi to the uno. My understanding is uart uses two pins one for sending and one for receiving. I have built myself one of these

enter image description here

I have only built myself one of these because I wasn't confident I can build it. I was expecting it would blow up or won't work. Anyway I was wondering do I need two of the above. Can I get anyway with just two of the following?

enter image description here

It would be very handy if I can because then I dont have to use more transistors and it's my understanding the first circuit is essentially the second circuit doubled up.