If you did this you would be making a brushed motor.
Yours Simon M.

have a look at this site. Its in French.
http://f5mna.free.fr/Arduino.htm
Yours Simon M.

I'm struggling here a bit.
I want to write a fresh file each time the SD card is inserted.
e.g.
data0.csv
data1.csv
data2.csv

so I thought that something like
count++
fileName="data" & count & ".csv"
could work.
but this approach looks to be rubbish.
What is the correct approach?
Yours Simon M.

Latest updates with more possible supplies added and part numbers

Yours Simon M

Noted Rob, I'll add that set to the next library release. ( Possibly later tonight)
Yours Simon M.

Umm, didn't show as I'd hoped. Now I'm awake, I've redone with the supplier link on the schematic.
Used Samtec parts:

SSQ-106-03-G-S /LL
SSQ-106-04-G-S /LL   

SSQ-108-03-G-S /LL
SSQ-108-04-G-S /LL   

SSQ-110-03-G-S /LL
SSQ-110-04-G-S /LL   

SSQ-118-03-G-D /LL
SSQ-118-04-G-D /LL   

SSQ-106-02-G-D /LL   
SSQ-106-03-G-D /LL

Arrow have the biggest range. Yet to find out from Newark if there database is out as as it has these parts as 2mm parts.

R3 MEGA version
Hope this is complete, If anyone can confirm the part No's for the connectors. Also displays in 3D
Yours Simon M.

R3 UNO version
Hope this is complete, If anyone can confirm the part No's for the connectors. Also displays in 3D
Yours Simon M.

Small error on supplier crept in so corrected

I have used the #include <MemoryFree.h> 'utility' and indeed when I go below 240 ish it dies. Why does is number go down over time? is the SP overflowing? I do expect the amount to drop through the program execution, but I can't understand why on each loop it gets less & less?  I do use arrays for averaging but these are reused on each full loop through. I might resort to storing raw data and calculate the other stuff when called.
Will clearing the arrays save memory, or will filling the arrays at boot to their max stop fragmentation?

Yours Simon M.

I know my listing is a mess but it is work in progress.
It is yet another weather monitor with a simple web printout of current status, with averaging function on all readings,  saved to SD card with time stamp.

I seem to be suffering memory creep thus my program and data is crashing into each other. how can I reduce the overheads? I noticed that Long's and floats use 4 bytes each. I could use strings more but not sure if this would save much? (or even how!)
Yours Simon M.

Could this be why I too get the dreaded
"avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51 Pro Mini"
when using the "Pro Mini (3.3V, 8 MHz) w/ ATmega328" with a mega328P chip fitted?

Yours
Simon M.

Hi Martin,
Can you give an example of how to use?

Yours Simon M.