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CongducPham / LowCostLoRaGw

Low-cost LoRa IoT & gateway with SX12XX (SX1261/62/68; SX1272/76/77/78/79; SX1280/81), RaspberryPI and Arduino boards
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Nano RFM65PCB: Nano 5v safe? #311

Open haimiko opened 3 years ago

haimiko commented 3 years ago

The nano is 5v on all digital pins which is not 3.3v safe for the RFM95. How is your PCB working without damaging the RFM95?

CongducPham commented 3 years ago

There is a 3.3V pin on the Nano.

haimiko commented 3 years ago

That's only for the RFM95 VCC. The other Nano digital pins are 5v only. You either need to use a Logic converter or convert the nano to run in 3.3v mode. I've downloaded your files and am modifying them to truely support the nano. This board will eventually fry the RFM95 digital pins.

On Mon, Jul 12, 2021 at 11:50 AM Congduc Pham @.***> wrote:

There is a 3.3V pin on the Nano.

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haimiko commented 3 years ago

Here you go. Have a look at that. NanoLoRaRFM95_3vCompat.zip

CongducPham commented 3 years ago

OK, I see what you meant. I didn't pay attention to this. Thanks for the new PCB you sent me. We are not really using the Nano and mainly use the ProMini in its 3.3V version.

regards,

haimiko commented 3 years ago

Yes. Logical. Unfortunately, some unknowing bystander may try to use the nano and destroy their radio ;) .

On Mon, Jul 12, 2021 at 11:51 PM Congduc Pham @.***> wrote:

OK, I see what you meant. I didn't pay attention to this. Thanks for the new PCB you sent me. We are not really using the Nano and mainly use the ProMini in its 3.3V version.

regards,

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CongducPham commented 3 years ago

I will put a notice for the nano.

regards,