Search found 64 matches

by effgee
Tue Sep 22, 2015 6:41 am
Forum: Random Chit-Chat
Topic: RS232 serial Data not sending
Replies: 2
Views: 3882

Re: RS232 serial Data not sending

why use softwareserial when you have 4 hardware uarts ? https://www.arduino.cc/en/Reference/Serial

Hardware serial will always be more reliable, some devices are fussy about exact timings, which software serial can't provide, especially depending what else your program is doing.
by effgee
Tue Sep 22, 2015 6:38 am
Forum: EtherMega
Topic: Can receive but not send serial data (on USB)
Replies: 2
Views: 2297

Re: Can receive but not send serial data (on USB)

thanks John as it turns out, I managed to get it working, in desperation I tried using Hyperterminal (laptop at the other end was XP) and to my great surprise communication worked both ways. I ended up using PuTTy (because I'm now more familiar with that than Hyper-terminal), un-installed arduino 1....
by effgee
Tue Sep 22, 2015 1:24 am
Forum: EtherMega
Topic: Can receive but not send serial data (on USB)
Replies: 2
Views: 2297

Can receive but not send serial data (on USB)

I've built about a dozen similar ethermega-based projects. I commonly get caught out where I've got an RS232 adaptor hooked up to D0 & D1...but that is not the case on this project. There is nothing connected to D0 & D1. I'm connecting remotely via Teamviewer (i.e. no physical access to the project)...
by effgee
Fri Nov 07, 2014 6:28 am
Forum: EtherMega
Topic: weird serial problem - USB works RS232 doesn't
Replies: 8
Views: 5250

Re: weird serial problem - USB works RS232 doesn't

update - I found some 0.6x0.6 stackable headers https://www.dropbox.com/s/h93yvs9yt8hfb2h/2014-11-07%200.60x0.60%20long%20extension%20headers.jpg?dl=0 the only trick is I found them in my parts bin, and don't know where I got them from. My best guess is they came with Pololu (since the plastic is bl...
by effgee
Mon Oct 27, 2014 12:27 am
Forum: EtherMega
Topic: weird serial problem - USB works RS232 doesn't
Replies: 8
Views: 5250

Re: weird serial problem - USB works RS232 doesn't

Hi Angus I'm remote from the project now, so I'm unlikely to get a chance to do the tests you suggest. I did enough A-B-A testing on Friday with the new & old ethermegas, 2 screw shields and 2 motor shields to convince myself that the thin legs IS the cause. I understand they 'should' be 0.4 thick, ...
by effgee
Fri Oct 24, 2014 8:15 am
Forum: EtherMega
Topic: weird serial problem - USB works RS232 doesn't
Replies: 8
Views: 5250

Re: weird serial problem - USB works RS232 doesn't

I believe the main problem is the pins on the screw shield are narrow, 0.33x0.60 instead of standard header pins at 0.60x0.60 (my measurements, maybe ±0.03 at worst). I suspect the thin pins don't spring the female metal connector inside the header enough to create a reliable joint. Pretty sure the ...
by effgee
Fri Oct 24, 2014 2:22 am
Forum: EtherMega
Topic: weird serial problem - USB works RS232 doesn't
Replies: 8
Views: 5250

Re: weird serial problem - USB works RS232 doesn't

OK, I have another piece of this puzzle now. Done another project, similar setup, except using a Pololu dual VNH5019 shield in place f the Seeed relay shield. Similar issues, a couple of pins not working. I've swapped to a different ethermega from the same batch, and onw down to a single pin not wor...
by effgee
Thu Sep 25, 2014 7:47 am
Forum: EtherMega
Topic: weird serial problem - USB works RS232 doesn't
Replies: 8
Views: 5250

Re: weird serial problem - USB works RS232 doesn't

thanks Angus after writing up the post, I came up with the theory that maybe the RS232 converter was being powered by 3.3V instead of 5, and that it doesn't reliably cross the 'high' threshhold. Does that sound possible ? I'll set up a test tonight to see if I can reproduce it. I don't have access t...
by effgee
Wed Sep 24, 2014 12:37 pm
Forum: EtherMega
Topic: weird serial problem - USB works RS232 doesn't
Replies: 8
Views: 5250

weird serial problem - USB works RS232 doesn't

I'm out of ideas on this one, so any thoughts are welcome. I can communicate both ways over USB, but can only send data via RS232. Configuration: - freetronics ethermega (3 actually, all behave the same) - freetronics terminal shield (with ethernet connector clearance notch) and - SEEEDstudio relay ...
by effgee
Fri Jul 18, 2014 8:00 am
Forum: EtherMega
Topic: EtherMega is back is stock
Replies: 4
Views: 3451

Re: EtherMega is back is stock

thanks