i am using arduino mega with 16 analog signal i use 14 analog signal with the groove current sensor mentioned here
http://www.seeedstudio.com/wiki/Grove_-_Electricity_Sensor
and the other two analog signal with two voltage transducer its output from 0 to 3vdc
i see a lot of noise in the readings after some times when i remove the voltage transducers the noise reduced and became verys small plz tell me what is the problem and how i can solve
note: i made the same ground for all the sensors
Try using a short delay(); before using analogRead() to read the other analogInputPins.
why should i do that is there any issue with the speed
Are the sensors all spread out? Do they use shielded cable with the shields grounded? Are your grounds all to one common point, or are they spread around, or worse in a loop? Have you tried using a low-pass filter?
What do you describe as noisy? There will always be noise of some form, it is just a matter of filtering it to be useful.
why should i do that is there any issue with the speed
It helps reduce the noise on each input, because theres only one A/D converter that you are reading from all those pins like A0 ,A1, A2 are all mux's and you change reading from multiple input pins.
and the other two analog signal with two voltage transducer its output from 0 to 3vdc
also checkout your adc reference, I think right now you are comparing the input to Gnd.
however checkout the DIDR register it is used to slowdown the input signalling for a high resistive load, setting it high may work for you.
is there any conflict between ac and dc readings ??
is there any conflict between ac and dc readings ??
what you mean precisely? Im not getting you here?
can i read ac and dc analog signals in the same arduino and what is the maximum voltage ac can the mega read
You are converting any signal you get to a digital signal. For AC signals, you need to record multiple points. For DC, you only need to record one point in theory, but that assumes the point doesn't move very fast. You might want to read up on Digital Signal Processing (DSP) to understand this better.
can i read ac and dc analog signals in the same arduino and what is the maximum voltage ac can the mega read
No you can't read AC signals using an Arduino.
Read this(Possible duplicate) forum.arduino.cc/index.php/topic,98852.0.html
NI$HANT:
can i read ac and dc analog signals in the same arduino and what is the maximum voltage ac can the mega read
No you can't read AC signals using an Arduino.
Read this(Possible duplicate) forum.arduino.cc/index.php/topic,98852.0.html
Sure you can. Just not mains AC or anything that is negative.