RFM69HCW and Arduino Uno R3 Problem

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jack0987
Posts: 19
Joined: Sun Aug 17, 2014 7:13 pm

RFM69HCW and Arduino Uno R3 Problem

Post by jack0987 » Mon Sep 10, 2018 5:49 am

I am following this tutorial:
RFM69HCW Hookup Guide
https://learn.sparkfun.com/tutorials/rf ... okup-guide


For one node, I am using the RFM69HCW and a Arduino Uno R3.
This combination is not working properly for me.

I have it wired the same as for the 5V Redboard in the tutorial.
I am using the same code as in the tutorial.

When I start the serial window for it the line "Node 1 Ready" appears.

Then I do a send and the line "Sendin" appears and nothing else.
Then it either seems to hang up or the line "Node 1 Ready" reappears.
It's reappearance tells me that the Arduino Uno has reset itself as this line
should only appear on startup.

Please comment.

AgroMe
Posts: 9
Joined: Mon Oct 02, 2017 8:21 pm

Re: RFM69HCW and Arduino Uno R3 Problem

Post by AgroMe » Mon Sep 10, 2018 6:40 am

I this exact set-up all the time and works perfectly so you must be doing something wrong or something is fried...
Did you use signal translators ? The Uno is 5V and the RFM69 is 3V.

jack0987
Posts: 19
Joined: Sun Aug 17, 2014 7:13 pm

Re: RFM69HCW and Arduino Uno R3 Problem

Post by jack0987 » Mon Sep 10, 2018 7:31 am

AgroMe wrote:
Mon Sep 10, 2018 6:40 am
I this exact set-up all the time and works perfectly so you must be doing something wrong or something is fried...
Did you use signal translators ? The Uno is 5V and the RFM69 is 3V.
Thanks. At least you confirmed to me that this setup will work.
I did use signal translators but I noticed that the brown colored line (D2) in the tutorial has no translator.
Is this OK?

jack0987
Posts: 19
Joined: Sun Aug 17, 2014 7:13 pm

Re: RFM69HCW and Arduino Uno R3 Problem

Post by jack0987 » Tue Sep 18, 2018 11:59 am

jack0987 wrote:
Mon Sep 10, 2018 7:31 am

... I noticed that the brown colored line (D2) in the tutorial has no translator.
Is this OK?
Did anyone pick up on this?
Should the brown line (wire) in the tutorial have a 5V to 3V converter?

jack0987
Posts: 19
Joined: Sun Aug 17, 2014 7:13 pm

Re: RFM69HCW and Arduino Uno R3 Problem

Post by jack0987 » Thu Sep 20, 2018 3:17 pm

AgroMe wrote:
Mon Sep 10, 2018 6:40 am
I this exact set-up all the time and works perfectly so you must be doing something wrong or something is fried...
Did you use signal translators ? The Uno is 5V and the RFM69 is 3V.
Got it working now. A failed solder connection may have been the problem. I resoldered all of the connections
and checked all of the wires.

jack0987
Posts: 19
Joined: Sun Aug 17, 2014 7:13 pm

Re: RFM69HCW and Arduino Uno R3 Problem

Post by jack0987 » Thu Sep 20, 2018 3:18 pm

jack0987 wrote:
Tue Sep 18, 2018 11:59 am
jack0987 wrote:
Mon Sep 10, 2018 7:31 am

... I noticed that the brown colored line (D2) in the tutorial has no translator.
Is this OK?
Did anyone pick up on this?
Should the brown line (wire) in the tutorial have a 5V to 3V converter?
Did anyone pick up on this?

jremington
Support Volunteer
Posts: 2305
Joined: Fri Jun 15, 2007 9:41 pm
Location: Eugene, Or

Re: RFM69HCW and Arduino Uno R3 Problem

Post by jremington » Sun Sep 23, 2018 8:48 am

O is an output on the module and can safely be connected directly to an input on a 5V Arduino (e.g. the "brown wire").

Usually, a 3V signal is recognized as a HIGH by a 5V Arduino, but for totally reliable connections, it is better use a logic level converter.

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