Tagged Questions
1
vote
2answers
70 views
how many resistance do i need to safe the LED of PC814?
if i have a input of 5v (arduino HIGH) on the LED of a PC814, how is the value of the resistance that i must use before that, so i don't burn the led?
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2
votes
2answers
190 views
What is the equivalent thevenin resistance of a digital output port on an Arduino Uno R3
How would I determine the thevenin equivalent resistance?
4
votes
4answers
830 views
Driving LEDs at long distance
I'm looking to drive 52 LEDs (datasheet), around a large inflatable tent. The LEDs have a forward voltage of 3.3V, at a maximum of 20mA.
I'm thinking of using the NXP SAA1064 I²C 16-channel LED ...
1
vote
3answers
741 views
How do electrical body fat detector work?
I would like to build me own electrical body fact calculator from a microcontroller (the Arduino), but I would like to know how does it work. I have a 5V analog reader, So I guess I sould calculate ...
0
votes
1answer
221 views
Strain gauges burned out in half bridge
I've been using a full wheatstone bridge (4 strain gauges) to read stress on a steel bar, through a circuit mounted on an arduino breadboard. This seemed alright. I later used two strain gauges of ...
