I'm trying to interface with a radio module (DNT900), and I'd like the ability for the Arduino to reset it. The device has an active low reset pin.
I've been running the DNT900 with the RESET pin disconnected and the device works fine, the device also works fine when the RESET is connected directly to 3.3v.
The issue is when I connect an Arduino pin via a 5v - 3.3v converter (CD4050) and set the pin HIGH or LOW, the device does nothing! I can't get any response on the serial line. I've also tried a 10k pulldown resistor connected from the arduino pin to GND.
Any suggestions on how to make this work would be appreciated.
Side question: How long would I have to set the line LOW to cause the device to reset?