Arduino Pro Mini 3.3V and 433mhz transmitter/received - how to connect?

Projects Networking, Protocols, and Devices
1

Hello

I own simple 433mhz transmitter and receiver 433MHz RF wireless receiver module amp 433 MHz transmitter module kit + 2PCS RF 433M Hz Spring Antenna compatible for Arduino - Free shipping - DealExtreme

Transmitter Operating voltage: 3.5~12V DC;
Receiver: Operating voltage: 4.75~5.25V DC;

I am interested if I can connect them to arduino Pro Mini 3.3V/8MHz. I will power both: Arduino and Transmitter/Receiver from the same 5V power source. I am not sure what about the signal cable? Can I connect the cable directly to Arduino Pro Mini 3.3V?

Thanks
Pawel

2

Transmitter : Yes.
The transmitter can be powered with 12V, and the data pin can be connected to an Arduino. So 5V is no problem either.
I have tested such a transmitter a few weeks ago, and it was still working fine with 3.0V. When you power it with 5V, it has more power than with 3.3V.

Receiver : Almost, maybe.
There is a LM358 opamp on the receiver, and its output is not 5V. Perhaps about 4V with some luck. According to the datasheet it is 3.5V maximum high output voltage.
About 1mA may be pushed into a pin. So (4.3V - 3.3V) / 1mA = 1000 ohm.
For safety I would add a resistor of 1k or 2k2. That is a resistor in the signal line from the data output of the receiver to the arduino pin.

3

Thanks! Hopefully, I will test it next week.