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Voltage levels on BCD pins are 4,8V for '1' and 0,01 for '0', enough to drive CD4511. CD4511 is powered by 5V same as MCU. One more wierd thing that I found is when I bring closer my hand to CD4511 inputs, other segments on display starts to blink.
For now I will leave this project in desk...
I tried some things and found that if I leave unconnected inputs of cd4511, display blinks an if I connect them to ground, display show 0 and don't blink. Whole time mcu is connected to NPN transistors and switching them (switching displays by pulling PNP base low).
Now I know that there is...
Your post make me to think. This LED display is 2,3" and I have measured voltage drop per segment and it is 7,5V (4 diodes in series), current through segment is 13 mA.
I checked displeys, ULN2003 and CD4511 like you said and they are fine. Instead of 2N3906 I put BC557, but to turn off that...
After some time I found that there is no problem with my code. I have disconnect my mcu from circuit to see what is the problem. When I connect A,B,C and D input of CD4511 IC to ground and bases of NPN tranistors to +5V on segment displays should be number 0 but there is 8 and it blinks. When I...
Here is my code. This project is thermometer that read temperature from LM35 analog pin using ADC. Code for reading temperature is good and working as need to. My only problem is displaying this temperature. I am trying but I can not find what is wrong.
One more question, should I leave COM on...
Hi,
After a lot of searching, I have found some similar threads but not the solution for my problem. I have two 2.3" common anode displays and I want to multiplex them and I made some circuit but it don't work. The problem is that displays are blinking, refresh rate is 60 Hz measured few times...
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