Hello,
what kind is Arduino UNO simple - output pins voltage? I want to calculate resistors values to leds (one resistor to one led, RGB led = 3 leds + 3 resistors).
Also this question is about and shift registers. I'm sorry about second question in this post, I do not want to create 2 different topic about same questions. What is their output pins voltage? Shift register model's no. is SN74HC595N.
I hope I wrote all information which need to help to me.
Thanks!
ugniusugnis:
what kind is Arduino UNO simple - output pins voltage?
Output voltage of any digital pin of Arduino UNO is 5V, you can use digitalWrite Arduino command to check it.. If you are using analog then it varies from 0V to 5V depending on your coding. Btw you can use multi-meter to measure that.
The sn74hc595 can operate on 2 to 5 v VDD and the supply voltage will define the pin output voltage. At 5v VDD the device can source or sink 6ma at pins.
Unless otherwise noted in the datasheet, the output voltage of any digital i/o is generally the operating voltage of the chip for HIGH and ground for LOW.
Under load, there is a voltage drop (on as NY chip). This is specified in the electrical characteristics and typical characteristics section of the datasheet (there are graphs of Voh and Vol vs current for the atmega328p); this is small relative to operating voltage of you aren't overloading the pins.
Dont ignore that 6ma limit on output current on the shift registers- people often like to drive LEDs with more than that. The TPIC shift registers are drop in replacements for the standard 595 shift registers, only with much stronger output drivers.