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1  Using Arduino / Sensors / Re: Hall Effect Generator/ RPM sensor on: October 11, 2012, 10:23:16 pm
Thanks very much for that. It will give me some areas to look into and hopefully solve my problem.
2  Using Arduino / Sensors / Re: Hall Effect Generator/ RPM sensor on: October 09, 2012, 11:54:31 pm
Well I have had another idea.

Is it possible to convert the signal to DC without too much loss.

I could then use an instrument amplifier to increase the signal for the Arduino?

Any ideas?

Cheers,
3  Using Arduino / Sensors / Hall Effect Generator/ RPM sensor on: October 07, 2012, 08:01:04 pm
Hi there,

I have a rpm sensor that I want to interface to an Arduino. I am not sure what I need to search for?

It is on an old Starter/Alternator test bench and is used to drive an analogue gauge. It has a shaft driven straight off the front of an Alternator/Starter Motor.

I have run up the sensor and I get out of the 2 wire an AC voltage which varies depending on speed. I got out 500mV AC just running it up with a drill at full speed.

I want to interface it to the Arduino but I am not sure what to do with AC voltage. I am using an MCP3208 for 2 other circuit as the resolution wasn't enough with the 10 bit onboard ADC.

Any help would be much appreciated.
4  Using Arduino / Programming Questions / Re: Running a Datalogger in different Modes on: May 13, 2012, 10:29:51 pm
Oh ok I thought that the Serial operation would be a lot slower operation and use more power that a switch would. I was thinking that the serial mode would be used to set RTC, copy file, erase file and general stuff like that. Ok will have to play around some more.

Thanks very much for you input it was much appreciated.
5  Using Arduino / Programming Questions / Running a Datalogger in different Modes on: May 13, 2012, 06:07:31 am
Hi all,

I am pretty new to the Arduino so be a little patient if the question has been asked may times. I have looked thru many pages but were unable to find an answer to my question.

I have a datalogger made up which saves data to an SD card.It works fine in its basic form. Now I have a sketch that can read data from the SD card and output it to a terminal program which saves the data to a txt file on the computer.

What I want to do is start basically merging them into one. I was thinking of using a switch as sort of a mode switch so that Serial is not enabled all the time just sitting there waiting for a command from a terminal program.

Would it be easier to make the 2 programs into like 2 separate functions and the loop basically directed which to use depending on the mode switch.

Or would there be a better way?? Any help would be appreciated.

Thanks in advance.

Craig
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