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Post by AlbEagle on Nov 22, 2020 14:56:48 GMT 2
I measured the connections from Arduino to MAX chips, also voltage. Leds are common cathode. All good!!! The chips I bought were €1,40 for 5pcs on aliexpress. Not realistic when I see prices from other suppliers, so I guess the problem is linked to the MAX7219 chips I have.
Thanks for thinking with me, will let you know when i got the new ones!  Got new chips, good ones from a good store, type MAX7219CNG+. Installed them and now the LED displays are light on. When I start Air Manager and connect 5V to the board then the displays are all 88888. When I write data then the display some displays are off and others are showing unknown characters?? Did a test with only a few MAX chips mounted, same problem. I checked all connection, they are good. Did a test with a complete display module to same arduino: example here And this works.... I guess EMC is the problem as the MAX chips use data communication (din/load/CLK) with Arduino. It can be, but the reason i don't think this is the case is because the software i designed it tells you if some components or pads are to close to each other and this is something i have paid attention to. |
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Post by AlbEagle on Nov 22, 2020 15:01:16 GMT 2
Can you try following:
1. Remove everything from the radio
2. Connect external power
3. Connect Arduino
4. Open Mobiflight (assuming FS is already open)
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bosal
New Member
Posts: 42
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Post by bosal on Nov 22, 2020 17:28:46 GMT 2
I found the problem, there is a grounding problem on radiostack V2!
I connected a MAX 7segment module to the arduino with data and power, then it works!
When I only connect data to the arduino and use a external powersuply for the 5V+GND then the display is messed up.
I connected the GND from arduino to the GND of powersupply => it works!
The ground of "encoders Arduino" should also be connected to the Ground of MAX chips or Powersupply connector on the PCB.
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Post by AlbEagle on Nov 22, 2020 18:43:20 GMT 2
I found the problem, there is a grounding problem on radiostack V2! I connected a MAX 7segment module to the arduino with data and power, then it works! When I only connect data to the arduino and use a external powersuply for the 5V+GND then the display is messed up. I connected the GND from arduino to the GND of powersupply => it works! The ground of "encoders Arduino" should also be connected to the Ground of MAX chips or Powersupply connector on the PCB. It should have been connected, maybe changing the ports has done any mod on gnd. |
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bosal
New Member
Posts: 42
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Post by bosal on Nov 22, 2020 21:26:07 GMT 2
I solved it by connecting the GND from EXTRA2 on the Arduino PCB to the GND of my powersupply. Got it working now with Mobiflight.
When I do tests wit Air Manager then it doesn't work stable? No idea why Air Manager is a problem?
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