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Message #21296

Klausi70

From: Kerpen Blatzheim, Germany

Posts: 68

Hi there,
my 7 segments suddenly stop working properly.
Example: COM1; First it shows correctly m, then when I turn in a different frequency it shows something right up to no more s. The display only comes on again after a restart.
It seems to me that it's getting worse and worse when I've finished another module in the pedestal. I have not made a chain and there are about 2 Max7219 modules on an Arduino.
Could it be that my USB HUB is overloaded?
Greeting
Klaus

2020-12-17 11:03

Message #21300

StephanHo

Moderator

From: EDDG, Germany

Posts: 1867

Supporter

Hi Klaus,

the 7219 is relatively sensitive. So if you have strong inductive Units in your power net it may happen that a voltage peak the 7219 brings out of step.Also other peaks in the power line may cause this.

If the USB-Hub may be overloaded can ot be said from here. That depends on all devices you have connected, not only the 7219 modules. What's about steppers or servos?
A USb-Hub with 10 connectors normally have a power supply with 5V and 3,5A. To check an overload you can connect one mega-module directly to an USB slot at your PC and look, what happens.Maybe that you have to split the connected devices. Look for devices with a high current consumption and connect them to another Hub or connector.
The specification for USB says that you can load up to 500mA for each connected device also on a Hub. Try it out.
I operate two chains with 14 modules (8+6) with the max7219 on one Mega-module and have no problems with the power.

Grüße,
Stephan (Time: UTC+2)

2020-12-17 18:12