General ArduinoGravity

control DFR0534 Voice Module from 5V Arduino - 1k for RX needed?

userHead Stefan.Krüger 2024-04-24 19:10:05 179 Views2 Replies

Hello DFRobot-Team,

i would like to now if it is save to connect the DFR0534 Voice Module to a 5V arduino system.

i have read at some points that it is needed to include a 1k Resistor in the Line:
from Arduino 5V SoftwareSerial TX Pin → 1K Resistor → DFR0534 RX Pin
to limit the current / Voltage going into the JQ8400 chip.


i did not find any shematics of the board - so i could look up if it is already on board…


looking forward to a reply from you :-)


sunny greetings

stefan krüger

2024-04-24 22:56:17

just probed the connections:

it seems that sadly there is no serial resistor on the board.

the connections are zero-ohm to the pins marked on the ic..

userHeadPic Stefan.Krüger
2024-04-24 20:33:01

i found

that states:

Power input DC 3.3 – 5.5V; best at 4.2V, IO port level at 3.3V

so it seems definitely i need some protection - or it is on the board already…


userHeadPic Stefan.Krüger