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Results tagged with analogread
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user 31105
A standard Arduino function for measuring the voltage on an analog pin via ADC.
1
vote
How to read analog pins from a second Arduino
Yes that is possible, you can even use as many Arduino's as you want and send the information to one 'master' Arduino to process the data.
What you need is a way to communicate between them. Dependin …
- 13k
1
vote
analog read only once a time
Store the current read value AND the previous value and check if a border has been crossed.
E.g.
if Previous value < 500 AND current value >= 500
Going from 0 to 1 -> return/send 1
else if Previ …
- 13k
0
votes
Using case statement with IR emitter reciever
ir1, s1);
break;
case 1:
process(led2, ir2, s2);
break;
}
}
void process(int led, int sw, int ir)
{
digitalWrite(led, HIGH);
digitalWrite(ir, HIGH);
delay(50);
while (analogRead … ;
pinMode(part.sw , INPUT);
}
}
void loop()
{
process(_parts[random(2)]);
}
void process(Part& part)
{
digitalWrite(part.led, HIGH);
digitalWrite(part.ir, HIGH);
delay(50);
while (analogRead …
- 13k
2
votes
Accepted
Data type explanation regarding analogRead of a photoresistor
See: analogRead.
It shows the return value is a 10 bit number, which means a value of 0 to 1023.
If you use uint8_t, which is an 8 bit value, it only can store values from 0-255. … It has the 10 bits you get from the analogRead function. …
- 13k
1
vote
Accepted
Why do you need to shift bits when reading from an analog sensor?
You read bytes in the order:
Most significant byte (let's call this msb)
Least significant byte (let's call this lsb)
The formula to get to real value is msb * 256 + lsb
256 because this is th …
- 13k
1
vote
Decode VGA port by Arduino
Calculation:
320 x 240 resolution (assuming 8 bits for 256 colors) is 76,800 bytes
Assuming a frame rate of 50, that is 50 * 76,800 = 3,840,000 bytes/s
The most Arduino's are 16 MHz so assuming qui …
- 13k
2
votes
Accepted
Why do all analog pins measure the same value?
If you want to measure a pin (i.e. defined as input pin, either digital or analog), you have to use a pull up or pull down resistor (either internal or external depending on what the MCU GPIOs have).
…
- 13k
4
votes
Accepted
What is the definition of these arduino commands, and how do they affect the circuit?
These are a lot of different questions. However, you can find most of the Arduino related answers in the official reference:
Arduino reference Guide
Some other answers:
how to declare variables:
…
- 13k
2
votes
ignoring potentiometer value variations
There are many ways to remove noise, below are some ways:
Only change the value when it differs enough. Assume the range is 0-1023. Than only change the value if the input value differs more than a …
- 13k