Moderators: Kent, lisa, luketeaford, Joe.
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I see your answer after my reply.pichenettes wrote:matcsat: one flaw in your solution is that the input impedance is 10k – which would cause a significant (10%) voltage drop if the module upstream includes a 1k protection resistor on its output. Also, you might fry the MCP6002 if the input voltage gets too high or too low.
long mymap(long x, long in_min, long in_max, long out_min, long out_max) {
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
i do not notice any performance troubles, (I encounter some jittering, but i think is due to the servos quality.), but to be honest i use the servos only for kicking some objects, not for reaching specific positions or other precise tasks.StillNotWorking wrote:OT but I found in an older version of Arduino that the map() function for some strange reason was acting rather slow. Copying the map() code to a local function gain me 1/12 speed increase when mapping ADC data.
Not sure if this still is an issue, but something to look out for if you don't get the performance you want.
long mymap(long x, long in_min, long in_max, long out_min, long out_max) {
return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
in your diagrams above, you have a bipolar signal coming in (+/-5) - if you want to work with the whole range from +5 to -5V you need to consider negative voltages as well. i could be reading your case wrong though!It is again necessary a negative power line that would increase the circuitation beyond my already dubious knowledge (the -12v in your schematics and like in the MI schematics).
i'm able to use the negative portion of the input CV signal thanks to the voltage feed at the "+" input of the opamp.*marcelds wrote:in your diagrams above, you have a bipolar signal coming in (+/-5) - if you want to work with the whole range from +5 to -5V you need to consider negative voltages as well. i could be reading your case wrong though!
