Trouble shooting the hardware board
29 April, 2012 - 19:51
I've just finished building the microprocessor board.
I got to the end of the instructions and guess what, no power to pin 7 of the CPU socket when compared to pin 8.
I can measure 18V at the input connection (should be be 15V?) but I have no other way to check the board. Whilst I'm not the worlds best solderer, I'm not the worst, I suspect my cat isn't very good.
I've checked the back of the board and can't see any obvious dry joints or crossed connections.
I'm clueless on electronics so haven't the faintest idea what to check next, so any help gratefully received.
On an upside I have got my PIC controlled working on the internet as a web server, the next session is to write an XAP client/server for it.
Thanks,
Rob.
29 April, 2012 - 21:32
#3
Not right
That's not good. There should be at least 4.8VDC coming out of the Livebox & into the PCB.
Disconnect the PCB from the Livebox & check the same pins directly on the RJ11 end of the cable (you will need pretty fine points on the probes on your multimeter to do this).
It's just possible that yuor Livebox is not feeding 5V or that the cable is in some way duff.
Derek
30 April, 2012 - 08:32
#5
That wont work
Its rj45 one end and mmj on the livebox end.
check the psu voltage unplugged from livebox mines apx 16V others may comment but 18 does sound a bit high.
3.18v is very low unless you have display and all 4 relays engaged (even then it is a bit low) sounds like a faulty cable or poor joint somewhere but Derek is the expert :)
Dean
30 April, 2012 - 09:05
#7
Cable check
I had meant that the MMJ to RJ11 cable be tested by plugging in the MMJ and checking the 5V at the RJ11 end (without the PCB being plugged in). 18V under load from the PSU does seem excessive. It's supposed to be a regulated 15V. However, the 12V vreg that takes this voltage down to that which the RF module requires can cope with an 18V input.
Unfortunately, I'm not at home so can't check any of my devices.
Derek.
30 April, 2012 - 12:01
#9
sorry got my 11's and 45's fuddled
:)
30 April, 2012 - 20:42
#11
Sounds like progress
If you point your browser at the address shown on the LCD, do you get the HAH serving you the web UI?
Some folks have reported firewall issues with xFx Viewer. It might be worth temporarily disabling any firewall while getting going.
Derek.
30 April, 2012 - 20:51
#12
VPN
I have found XFX viewer latches onto my VPN ip if i am vpn'ed into anywhere (i access several remote sites)
and when it does this i only see my laptop in XFX viewer :)
Just a thought.
Dean
P.S your 99% there :)
1 May, 2012 - 08:08
#16
windows 7
yep found same the other day tftp port shown as opened but it was NOT or it was doing strange thing :(
glad you found it.
xp compatibility mode is the only saving grace with win7
Hi Rob,
First thing. Don't panic! Many folks have gotten their HAH PCB up and running after a bit of help. If all else fails, I offer a 'return to base for fix' warranty.
The first thing to check is that 5V is being fed to the PCB by the MMJ to RJ11 cable that connects the PCB to the Livebox. So, look at the schematic diagram for the PCB at http://www.dbzoo.com/_media/livebox/pcb_rev1.jpg
and you will see that 5V is on pin 5 of the RJ11 socket and Gnd is on pin 6.
Do you get a 5V reading here with your multimeter (careful not to let the probes slip & accidentally short Gnd to 5V)?
Don't plug in the AVR microcontroller until you get 5V between pins 7 (5V) & 8 (Gnd) on the microcontroller socket.
Cheers,
Derek.