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Rang: Spezialist
Gruppen: Beta Tester, Member
Mitglied seit: 11/1/2005
Beiträge: 388
Wohnort: Levallois - FRANCE
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Bonjour,
Main concern with the colour sensor is the accuracy of the measures. Part of the explanation may come from the sensor itself, but another part from the Robo TX built-in analogic to digital converter (ADC in short).
So I performed a series of measures with two Robo TX controllers analog to digital converters (ADC) and two digital multimeters (DMM).
Check the new section Inside Robo TX Controller.
--- rei_vilo
France
sites.google.com/site/vilorei/fischertechnik
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Rang: Spezialist
Gruppen: Beta Tester, Member
Mitglied seit: 11/1/2005
Beiträge: 388
Wohnort: Levallois - FRANCE
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Bonsoir,
I performed the same tests but with an extended range and a better digital multimeter.
Apart from values below 3V, the error margin is close to 1%.
Keep in mind that for low value, the fix error (eg. + or - 1 unit) weights more.
--- rei_vilo
France
sites.google.com/site/vilorei/fischertechnik
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Rang: Spezialist
Gruppen: Member
Mitglied seit: 10/29/2005
Beiträge: 234
Wohnort: Maartensdijk (NL)
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Bonsoir,
I have used my Fluke 289 in order to measure the inputs from the encoding motors,
preparing the test on coming saturday. Can you compare your DMM with mine?
Keep you posted.. cheers Richard
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Rang: Spezialist
Gruppen: Beta Tester, Member
Mitglied seit: 11/1/2005
Beiträge: 388
Wohnort: Levallois - FRANCE
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Bonsoir Richard,
Sure, no problem, you're welcome 
I'm using a digital multimeter from Uni-T, the UT-71C.
If this can help, please use the Excel file I provided here (bottom of the page).
I've experienced a slight difference from one Robo TX to another, about 10 mV, as shown here. Last digit (ie. 1 mV) is meanless.
Best regards,
--- rei_vilo
France
sites.google.com/site/vilorei/fischertechnik
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