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import serial
import queue
import threading
class InductionHeater:
"""Interface to the MHS5200A function generator driving the LC tank"""
def __init__(self, port, induction_min, induction_max):
self.port = port
self.induction_min = induction_min
self.induction_max = induction_max
self.queue = queue.Queue(1)
def start(self):
self.serial = serial.Serial(self.port, 57600)
self.thread = threading.Thread(target=self.thread_target)
self.thread.start()
def thread_target(self):
while True:
amount = self.queue.get()
if amount is None:
break
amount = max(min(amount, 0.5), -0.5)
freq = ((self.induction_min + self.induction_max)/2
+ amount*(self.induction_max - self.induction_min))
command = ":s1f{:010d}\n".format(int(freq*1e2))
self.serial.write(command.encode())
self.serial.readline()
def set(self, amount):
self.queue.put(amount, block=False)
def stop(self):
self.queue.put(None, block=True)
self.thread.join()
self.serial.close()