Help Finding an Arduino Board with 5V Logic and BLE

Official Hardware UNO Family UNO R4 WiFi
1

Hey everyone,

I just got an Arduino UNO R4 for a project where I’m integrating it with a PCB board I designed. However, I only realized in the past couple of hours that the UNO R4 outputs 3.3V logic levels, which makes it incompatible with my setup, even though it has all the other features I need.

I was hoping you could help me find an Arduino board that best suits my needs. Here’s what I’m looking for:

  1. Outputs 5V logic levels.
  2. Can accept input up to 9V (from a battery) or more.
  3. Has Bluetooth (preferably BLE) for app integration.
  4. Is roughly the same size as the UNO R4 and has a similar number of pins (I’ll only use about 5 digital pins).

Thanks a lot for your help!
Noy

2

BLE and 5V is not common. If only 5 pins, you could use a bidirectional level shifter. If that is OK, the NANO 33 BLE would be my choice.

3

That is incorrect the outputs are 5V.

See the datasheet at docs.arduino.cc/resources/datasheets/ABX00087-datasheet.pdf for details.

4

Thanks

5

I've measured the voltage over 220Ohm resistor and got 3.8V.
And ChatGPT said it's 3.3V.

6

ChatGPT is brain dead. If you want to meter Voltage, learn how to do it. For now just look at the datasheets. I have extracted the part that is important.

Screenshot 2025-01-08 at 12.00.33
Screenshot 2025-01-08 at 12.00.331060×254 15.4 KB

7

:scream:
Fake news.

Uno R4 WiFi Output Voltage and Current
Uno R4 WiFi Output Voltage and Current1038×476 42.4 KB

3.8V / 220Ω ≈ 17mA

That load of 200Ω draws more than the maximum safe current of 8mA from the output.

8

You were misled by misinformation from a chatbot. Have fun!

1 Like
9

Did you also use Chat to help you design it?

10

Thanks!

At first, I thought I could power all the components in my PCB circuit using the 5V and 3.3V output pins on the microcontroller. Should I use two voltage regulators to power my circuitry (5V and 3.3V) and leave the output pins alone so they won't draw too much current?

If I want to stay within the 8mA limit of the GPIOs, would I just need to place a large resistor between the circuit and the GPIO pins? Since all the other components are powered by the voltage regulators, they would draw their current from them instead.

Or am I completely wrong and embarrassing myself here? :sweat_smile:

Thanks again!

11

Need to see a schematic.

12

Yes, as long as the total resistance doesn't go much below 1kΩ you will be OK.

680Ω is about the minimum value you can have between an output pin and GND.