Adjust brightness through analog or digital means.Energy-efficient low-power shutdown mode.Hence, it is a go-to solution for low-power applications. Otherwise, the sequence of operation works as it should.The MAX7219 offers a low-power shutdown mode consuming only 150 ♚, analog and digital brightness control, a scan-limit register to display 1 to 8 digits, and a test mode to light up all LEDs. I also powered the scoreboard, did not operate any of the controls (relays, switches, motors etc.) and still, the display shuts down. I ordered another terminal adapter, because I suspect there may be a defect, or loose connection causing the Nano to lose power.īut I cannot explain why the display cuts out every 10 - 12 seconds consistantly. I am using a terminal board adapter for the Nano, and I noticed the LED light on the Nano went off once or twice, and when my finger touched the shell (housing) for the PWR connector, the light went back on. Not sure if the power problem is affecting both the Matrix and the scoreboard.

I should mention, that the matrix works well, but sometimes the display loses the alphanumeric readout and all LED's for all sections light up, and I need to reset it.

It is a switched +5V through the START relay. The relay contacts send 5V to the corresponding Nano pins. The terminal strip is connected to outputs from a micro PLC (5V output). Yes, one Nano is for the scoreboard display and one is for a 8 X 8- 4 in 1 Dot Matrix display. I keep a meter on the 5VDC and there is little flucuation. I also tried a filter circuit I found on the internet using a 100uF electrolytic, a 200 uF electrolytic with a 10 ohm resistor in series between them.ĭoes anyone have a suggestion as to what is happening? The interference seems to have gone away, but I now have this shutdown problem. I made sure to ground only one end of the cable. Originally I was experiencing interference when I operated a small 12VDC motor, so I ran all wiring to the display in a 2 wire shielded cable for the 5V, and a 3 wire shielded cable for the signal wires. If I raise the voltage to 5.4, it stays off I then adjusted the 5vdc supply from 5.0 to 4.5v, but still shuts down. I tried placing a 330 ohm resistor in series with the display, no good.

33 uF cap across the power supply, same thing.

The problem I am having is that after 10-12 seconds, the display shuts off. I am using a Maker Focus 5V - 8 digit-7-Segment display using a MAX7219 in an arcade I'm making.

7 segment display font generator