MS5607 Sensor and Controlling DC Motor

rhampto1 · 2013-04-25 13:06

I've got the Board of Education with the MS5607 altimeter module and LCD display. The code for it is working great and it performs well, however, I would like to use pulse width modulation to control a motor as well based on the feedback from the sensor. Something such as if altitude is 7200 then the DC motor is at 100% but when it reaches 7250 it goes to 50%...Does anybody have a general idea about how to go about this? New to the Propeller scene. Thanks in advance.

SRLM · 2013-04-25 14:18

You should use a PWM object. If you go to Obex and look under motor control there are several options. This one would be a good place to start:

http://obex.parallax.com/object/481

rhampto1 · 2013-04-26 11:58

Yeah,

No luck with that....trying to trouble shoot my if statement first by making the lcd play a tone based on the if statement and I can't get that to work either. It is listed below:

OBJ
display : "FullDuplexSerial.spin"
alt : "29124_altimeter"
number : "FloatString"

CON
_clkmode = xtal1 + pll16x ' Sets frequency
_xinfreq = 5_000_000 '
TX_PIN = 2 'Sets pin for Rx communictation with LCD
BAUD = 19_200
START_ALT = 7200 ' Enters a reference elevation for the pressure to be calibrated off of.

PUB start | a, t, altitude 'Sets a,t,altitude as variables
display.start(TX_PIN, TX_PIN, %1000, 19_200) ' Start Parallax FullDuplexSerial.
waitcnt(clkfreq / 100 + cnt) ' Pause for FullDuplexSerial.spin to initialize
display.tx(17) ' Turn on display backlight
alt.start(alt#QUICKSTART, alt#BACKGROUND) ' Start altimeter for QuickStart with background processing.
alt.set_resolution(alt#HIGHEST) ' Set to highest resolution.
alt.set_altitude(alt.m_from_ft(START_ALT * 100)) ' Set the starting altitude, based on average local pressure.
repeat
a := alt.altitude(alt.average_press) ' Get the current altitude in cm, from new average local pressure.
display.str(string("Alt:")) ' Print header Altitude:....
display.str(alt.formatn(a, alt#TO_FEET,8)) ' Print altitude in feet
t := alt.current_temp ' Get the current temperature.
display.str(string("Temp:")) ' Print header Temp:.....
display.str(alt.formatn(t, alt#TO_DEGF,8)) ' Print temperature in Farenheit
display.tx(13) ' Line feed

repeat
altitude:=number.FloatToString(alt#TO_FEET)
if altitude>7201
display.tx(212)
display.tx(220)

SRLM · 2013-04-30 12:15

You'll need to post your code with the [ code ] tags (without the space) to preserve the formatting. For example:

repeat
	debug.str(string("Hello, World!"))

MS5607 Sensor and Controlling DC Motor

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