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Topic: transmitter troubles (Read 692 times) previous topic - next topic

jkaps

Hi all,

I am new to circuits so I appreciate any help. I have a 315MHZ transmitter/receiver pair but they are not working correctly. I have a Teensy 2.0 reading the value of analog sticks and then sending that value through the transmitter to and Arduino Nano 3.0. My problem is that the signal being outputted by the transmitter is a lot stronger(higher) than the one being received by the receiver.(I attached my oscilloscope image to help you understand the problem, CH1 is my transmitter and CH2 is the receiver). please give me any ideas you have, at this point ill try anything.

Thanks


CrossRoads

Are you using antennas? Does the receiver have good power?
What are the two modules?
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

jkaps

1. The antennas are optional, but as I am testing in a six inch area I dont think they are necessary 2. Yes the receiver is getting good power (not the optimal 9v but it is getting 6) 3. I am using this 315MHZ low cost transmitter/receiver pair http://www.robotshop.com/seeedstudio-315mhz-rf-low-cost-transmitter-receiver-pair.html

Thanks for your time

floresta

#3
Jul 21, 2011, 09:47 pm Last Edit: Jul 21, 2011, 10:15 pm by floresta Reason: 1
Quote
The antennas are optional ...


And the options could very well be
(a) if reliable operation is required then use antennas.
(b) if reliable operation is not required then don't use antennas.

One wouldn't normally think that antennas are necessary for a 6" range, but you are talking about very inexpensive (cheap) devices.


Don

jkaps

I added the Antennas yet the problem has not gone away.

KE7GKP: Yes it was from the correct data output pin on the receiver, I double checked after your suggestion. I agree that the signal is getting there but it is very low but why?

Thanks

CrossRoads

What is the receive data pin going into? Arduino pin set up as an input & nothing else? The signal looks to be loaded down by something.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

jkaps

Yes it is just input to the RX pin on the arduino and then the arduino controls servos based on the signal.

CrossRoads

Post your sketches then, and whatever you have for scheematics, lets see what is going on.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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