Using an RF7020 with ATmega328

Projects Interfacing w/ Software on the Computer
1

I am trying to set up an ATmega328 with the RF7020 module so that I can send data from the ATmega to my computer.

I have the system working fine when I use the Arduino Uno board, it sends the data perfectly. However when I use the 'standalone' PCB I have built with the ATmega it is not sending anything. I have since tried it on a breadboard to see if that is the issue but no joy, I am getting the same results.

I have placed an LED on the TXD leg and it illuminates which I assume means that data is being sent?

This is the circuit I am using:

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Is there anything else I need to do to the circuit to enable the rxd and txd legs to work?

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@richnotts
Do you know for sure that the program is running?

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@richnotts
B1 5V connected to a 7805 will never work.
B1 need to be greater than 7V

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Yes all working, I have tried it the ATmega in the arduino unit and it was fine.

5

Yea sorry, I am using a PP3 9V battery.

6

I mean on the breadboard. How do you know the program is actually running?

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No. The Tx pin is normally high

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I have just done a test program with an LED flashing on a digital output and it worked fine so I assume it's OK. I will keep investigating. Thanks

9

Thanks for all the feedback. I have now got it all working. Turns out it was a dry joint on the 10L resistor from leg 1 to +5v. Soldering skills let me down!

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