22-07-2015, 23:55
The common point of the three reports are the "freeze", that seems to happen at different circumstances for each of you:
vk2kzo - "freeze" occurs as soon as you connect the usb cable, but occasionally may work.
qldbureau: seems similiar circunstances to vk2kzo, adding that the logger seems to stop working when the board is powered by external power.
dormani: a slightly different behaviour, but with the same results.
From all reports, I think I can conclude that the problem is somehow related with the USB communication. I never seen this behaviour, and I'm trying to reproduce the problem, one thing I'm sure, it's not software related.
Not all Arduino Nanos are equal, even those that seems to be, and use the same chipset. I did some research on google, and found some reports of problems with the USB communications with certain CH340 "chinese" Nanos, when we get power from the 3.3V pin, without decoupling it to ground via a 100nF capacitor.
Add this 100nF capacitor to the RX v4.03 board is very easy. I'm not sure if this will solve the problem, but if any of you want to try, here is a picture showing a easy place to solder the referred 100nF capacitor. If you prefer for esthetic reasons, it can be done in the under side of the board.
![[Image: RX_v403_3.3VCap.jpg]](http://www.meteocercal.info/forum/images/01forum_img/RX_v403_3.3VCap.jpg)
Quote:Disconnect usb lead, LCD display immediately shows updated screen.Same on two rx units .Dodgy serial to usb chips? Has, on occasion, worked fine on Cumulus, but only for a short while, then locks up as before...
vk2kzo - "freeze" occurs as soon as you connect the usb cable, but occasionally may work.
Quote:Just to clarify mine does not usually lock immediately. It has ranged from within half a minute to maybe a few hours before activity ceases. Since I have the LEDs on the front panel it only needs a glance for me to know.
qldbureau: seems similiar circunstances to vk2kzo, adding that the logger seems to stop working when the board is powered by external power.
Quote:When I am connected to my computer receiver is being updated (usually). When I start Cumulus the logger historic data updates fine but the receiver does no longer refresh as the display does not change until I disconnect from Cumulus.
dormani: a slightly different behaviour, but with the same results.
From all reports, I think I can conclude that the problem is somehow related with the USB communication. I never seen this behaviour, and I'm trying to reproduce the problem, one thing I'm sure, it's not software related.
Not all Arduino Nanos are equal, even those that seems to be, and use the same chipset. I did some research on google, and found some reports of problems with the USB communications with certain CH340 "chinese" Nanos, when we get power from the 3.3V pin, without decoupling it to ground via a 100nF capacitor.
Add this 100nF capacitor to the RX v4.03 board is very easy. I'm not sure if this will solve the problem, but if any of you want to try, here is a picture showing a easy place to solder the referred 100nF capacitor. If you prefer for esthetic reasons, it can be done in the under side of the board.