How to reduce the brightness of the digital tube

邱海涛qht

How to reduce the brightness of the digital tube [Copy link]

How to reduce the brightness of the common cathode digital tube directly connected to the MCU IO port without adding a current limiting resistor? Dynamic scanning of three-digit digital tube

邱海涛qht

Pure software implementation

lising

I don't know if it is possible to reduce the scan time.

cjfwindy

Reduce refresh rate

qwqwqw2088

If no current limiting resistor is added, the dynamic scanning frequency of the digital tube can be changed by software.

仙猫

To be precise, it is not about reducing the scanning frequency, but reducing the lighting duty cycle.

邱海涛qht

Xianmao published on 2019-1-4 00:52 To be precise, it is not to reduce the scanning frequency, but to reduce the duty cycle of the lighting.

Useful

tiankai001

Xianmao published on 2019-1-4 00:52 To be precise, it is not to reduce the scanning frequency, but to reduce the lighting duty cycle.

Yes, reducing the duty cycle. It is equivalent to reducing the lighting voltage of the digital tube, which actually reduces the lighting time and increases the off time.

chunyang

Reduce the duty cycle, but do not let the peak current exceed the maximum limit allowed by the LED. Check the manual to make sure.