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import PID | |
import time | |
import os.path | |
from OmegaExpansion import AdcExp | |
from OmegaExpansion import pwmExp | |
pwmExp.setVerbosity(-1) | |
pwmExp.driverInit() | |
adc = AdcExp.AdcExp() | |
targetT = 35 | |
P = 10 | |
I = 1 | |
D = 1 | |
pid = PID.PID(P, I, D) | |
pid.SetPoint = targetT | |
pid.setSampleTime(1) | |
def readConfig (): | |
global targetT | |
with open ('/tmp/pid.conf', 'r') as f: | |
config = f.readline().split(',') | |
pid.SetPoint = float(config[0]) | |
targetT = pid.SetPoint | |
pid.setKp (float(config[1])) | |
pid.setKi (float(config[2])) | |
pid.setKd (float(config[3])) | |
def createConfig (): | |
if not os.path.isfile('/tmp/pid.conf'): | |
with open ('/tmp/pid.conf', 'w') as f: | |
f.write('%s,%s,%s,%s'%(targetT,P,I,D)) | |
createConfig() | |
while 1: | |
readConfig() | |
#read temperature data | |
a0 = adc.read_voltage(0) | |
temperature = (a0 - 0.5) * 100 | |
pid.update(temperature) | |
targetPwm = pid.output | |
targetPwm = max(min( int(targetPwm), 100 ),0) | |
print "Target: %.1f C | Current: %.1f C | PWM: %s %%"%(targetT, temperature, targetPwm) | |
# Set PWM expansion channel 0 to the target setting | |
pwmExp.setupDriver(0, targetPwm, 0) | |
time.sleep(0.5) |
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