Rf modules dont work correct at my project
时间：04-04
整理：3721RD
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Hey guys,
I am Murat, I have just registered to your forum :) I have a serious problem about my project maybe you can help me? if you, i will be happy :) So here is my project.
There are 1 circuit and 1 pc based serial communication, pc and circuit board are communicating with each other by using cheap 433 mhz rf modules
Transmitter: Dra886tx
Receiver: mx-rm-5v
Both pc and circuit sides have these rx and tx modules together and each side they are working with same power supply.
At the pc side power comes from USB port,
At circuit board power comes from 7805 circuit,
All connections true but i will sent to a diagram of my circuit later.
Also my software correct too i tested all.
My project is: pc sending a a string like "sent" via rf module to pic16f88 then pic reads this data and compare it with its own data array if this data same to pics' data array then pic reads an0,an1,an2 and sent these data to pc via rf module.But it doesnt work correctly in real life. I have done a lot of tests and i saw that rf rx and tx modules dont work with same power supply on pic side, on pc side they work together perfectly. I mean tx module work well with rx with same power supply but rx module cant work with tx with same power supply. If you unplug tx cable from pic, rx works perfect. Also if you attach a 100 uf to rx module and unplug the tx module antenna at 2-3 cm range pc and pic communicate i mean pic can receive data but cant sent without antenna. I tried to feed 2 modules with 2 7805 doesnt work. I also tried to attach diots to rf modules power lines nothing changed. A tried pull up and pull down resistors to data lines and it didnt work neither. So i need your help guys. Or i am going to be insane Thanks a lot i am waiting your replies.
Best Regards,
I am Murat, I have just registered to your forum :) I have a serious problem about my project maybe you can help me? if you, i will be happy :) So here is my project.
There are 1 circuit and 1 pc based serial communication, pc and circuit board are communicating with each other by using cheap 433 mhz rf modules
Transmitter: Dra886tx
Receiver: mx-rm-5v
Both pc and circuit sides have these rx and tx modules together and each side they are working with same power supply.
At the pc side power comes from USB port,
At circuit board power comes from 7805 circuit,
All connections true but i will sent to a diagram of my circuit later.
Also my software correct too i tested all.
My project is: pc sending a a string like "sent" via rf module to pic16f88 then pic reads this data and compare it with its own data array if this data same to pics' data array then pic reads an0,an1,an2 and sent these data to pc via rf module.But it doesnt work correctly in real life. I have done a lot of tests and i saw that rf rx and tx modules dont work with same power supply on pic side, on pc side they work together perfectly. I mean tx module work well with rx with same power supply but rx module cant work with tx with same power supply. If you unplug tx cable from pic, rx works perfect. Also if you attach a 100 uf to rx module and unplug the tx module antenna at 2-3 cm range pc and pic communicate i mean pic can receive data but cant sent without antenna. I tried to feed 2 modules with 2 7805 doesnt work. I also tried to attach diots to rf modules power lines nothing changed. A tried pull up and pull down resistors to data lines and it didnt work neither. So i need your help guys. Or i am going to be insane Thanks a lot i am waiting your replies.
Best Regards,
Can you post your circuit diagram?