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Re: Programming a Devantech Magnetic Compass - CMPS03
Ok I was vague on the problems with the compass, so here is the problem-
I am using the IFI Dashboard to read the PWM output (0-255) but when I turn on the robot the value shots up to 60 (not exactly) then quickly goes back to 0 then repeats the process at a slower rate. Then about a minute in to the process it eventually stops at 28. Nothing affect the process, if I turn the compass or put it by the motors it stays the same. This is the Aliases- * Below are aliases for reading an analog voltage on the ANALOG INPUTS * using the Get_Analog_Value() function. */ #define Temp_Guage ADC_CH0 #define Pressure_Guage ADC_CH1 #define rc_ana_in03 ADC_CH2 #define Compass ADC_CH3 #define rc_ana_in05 ADC_CH4 #define rc_ana_in06 ADC_CH5 #define rc_ana_in07 ADC_CH6 #define rc_ana_in08 ADC_CH7 #define rc_ana_in09 ADC_CH8 #define rc_ana_in10 ADC_CH9 #define rc_ana_in11 ADC_CH10 #define rc_ana_in12 ADC_CH11 #define rc_ana_in13 ADC_CH12 #define rc_ana_in14 ADC_CH13 #define rc_ana_in15 ADC_CH14 #define rc_ana_in16 ADC_CH15 #define SIXTEEN_ANALOG ADC_16ANA /* All analog */ This is how I call it- pwm11 = Get_Analog_Value(Pressure_Guage)/4; pwm12 = Get_Analog_Value(Temp_Guage)/4.023; pwm13 = Get_Analog_Value(Compass)/4.023; { unsigned int temp; temp = Get_Analog_Value(Compass); temp *= 4023; //fraction version of temp /= 1000; //your conversion factor - avoid floating point pwm13 = (unsigned char)temp; printf("%d", pwm13); } Thank you! By the way, I am using the Devantech Magnetic Compass - CMPS03 on a ROV so there no other robots around and also the motors we are using are about a 1.5 feet away and are small. (Nothing like the big CIMs) The only things that could interfere is the Aluminum water proof housing, or the electronics beside the compass. Heres a link to some Pictures if that could help you- (The compass is not in these pictures but is inside the Aluminum water proof housing) http://picasaweb.google.com/KE7JLM/RobotAllan Last edited by kE7JLM : 28-09-2007 at 00:34. |
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