Now i am going to check the RF module by using a click button that connected with data pin at transmitter side and a led at receiver side. (Without any PIC or device and Both RF module are install a wire as antenna). Both are connected with difference power supply. So what i want to check is when i am click the button and the led will be light up.
Is my method to check the RF module is fine to perform is correct? Or any other method can teach me to check the function of RF module?
Are you saying that if you send 0V on the data of Tx Module, you're expecting a 0V at the data of the Rx Module? And if you're sending +5V, you'll get +5V on the Rx side?
I tried to examine the Tx and Rx module with a magnifying glass and found that the Tx Module is made up of 3 transistors and the data pin goes through a 20K resistor before entering the first transistor. The Rx module has an op-amp LM358 on it. The op-amp is either used as an amplifier to amplify the received signal or as a comparator. The input can be either AC coupled or DC coupled.
You may test by applying a low voltage say 2V on the Tx's Data pin and put a voltmeter on the Rx's Data pin. If there is nothing on the Rx then increase the voltage to 3V and watch the voltmeter again. If the module is DC coupled, you should get something on the voltmeter.
See the discussion here:
http://www.electro-tech-online.com/gene ... e-ask.htmlPutting a LED on the data pin to test is not a good idea. If the output is not able to drive 20mA, you might spoil the Rx module (LM358).
Allen