def cleanAndExit():
print("Cleaning...")
if not EMULATE_HX711:
GPIO.cleanup()
print("Bye!")
sys.exit()
def readNextBit(self):
# Clock HX711 Digital Serial Clock (PD_SCK). DOUT will be
# ready 1us after PD_SCK rising edge, so we sample after
# lowering PD_SCL, when we know DOUT will be stable.
GPIO.output(self.PD_SCK, True)
GPIO.output(self.PD_SCK, False)
value = GPIO.input(self.DOUT)
# Convert Boolean to int and return it.
return int(value)
def set_gain(self, gain):
if gain is 128:
self.GAIN = 1
elif gain is 64:
self.GAIN = 3
elif gain is 32:
self.GAIN = 2
GPIO.output(self.PD_SCK, False)
# Read out a set of raw bytes and throw it away.
self.readRawBytes()
def power_down(self):
# Wait for and get the Read Lock, incase another thread is already
# driving the HX711 serial interface.
self.readLock.acquire()
# Cause a rising edge on HX711 Digital Serial Clock (PD_SCK). We then
# leave it held up and wait 100 us. After 60us the HX711 should be
# powered down.
GPIO.output(self.PD_SCK, False)
GPIO.output(self.PD_SCK, True)
time.sleep(0.0001)
# Release the Read Lock, now that we've finished driving the HX711
# serial interface.
self.readLock.release()
def power_up(self):
# Wait for and get the Read Lock, incase another thread is already
# driving the HX711 serial interface.
self.readLock.acquire()
# Lower the HX711 Digital Serial Clock (PD_SCK) line.
GPIO.output(self.PD_SCK, False)
# Wait 100 us for the HX711 to power back up.
time.sleep(0.0001)
# Release the Read Lock, now that we've finished driving the HX711
# serial interface.
self.readLock.release()
# HX711 will now be defaulted to Channel A with gain of 128. If this
# isn't what client software has requested from us, take a sample and
# throw it away, so that next sample from the HX711 will be from the
# correct channel/gain.
if self.get_gain() != 128:
self.readRawBytes()
def __init__(self, dout, pd_sck, gain=128):
self.PD_SCK = pd_sck
self.DOUT = dout
# Mutex for reading from the HX711, in case multiple threads in client
# software try to access get values from the class at the same time.
self.readLock = threading.Lock()
GPIO.setmode(GPIO.WIRINGPI)
GPIO.setup(self.PD_SCK, GPIO.OUT)
GPIO.setup(self.DOUT, GPIO.IN)
self.GAIN = 0
# The value returned by the hx711 that corresponds to your reference
# unit AFTER dividing by the SCALE.
self.REFERENCE_UNIT = 1
self.REFERENCE_UNIT_B = 1
self.OFFSET = 1
self.OFFSET_B = 1
self.lastVal = int(0)
self.DEBUG_PRINTING = False
self.byte_format = 'MSB'
self.bit_format = 'MSB'
self.set_gain(gain)
# Think about whether this is necessary.
time.sleep(1)
def is_ready(self):
return GPIO.input(self.DOUT) == 0
def set_buzzer(self, state=0):
GPIO.output(BUZZER_PIN, state)
return 0
def get_pauseBtn(self): # to get the state of the pause button
return GPIO.digitalRead(PAUSE_BTN_PIN)
def set_stateLed(self, state=0):
GPIO.output(STATE_LED_PIN, state)
return 0
def get_stateLed(self):
return GPIO.digitalRead(STATE_LED_PIN)
def set_pauseLed(self, state=0):
GPIO.output(PAUSE_LED_PIN, state)
return 0
def get_pauseLed(self):
return GPIO.digitalRead(PAUSE_LED_PIN)
def set_startLed(self, state=0):
GPIO.output(START_LED_PIN, state)
return 0
def get_startLed(self):
return GPIO.digitalRead(START_LED_PIN)
def get_stopBtn(self): # to get the state of the start button
return GPIO.digitalRead(STOP_BTN_PIN)
def get_buzzer(self):
return GPIO.digitalRead(BUZZER_PIN)
# - a library to communicate with the MICHA board using another main code file # - a standalone code to test the I/O of the MICHA board import traceback from serial import Serial, PARITY_NONE from umodbus.client.serial import rtu import Odroid.GPIO as GPIO import time SLAVE_ID = 1 VOLTAGE_REF = 2.497 # value of the excitement voltage reference THERMI_WIRE = 0.6 # value of the twin wire resistor # Odroid configuration GPIO.setmode(GPIO.BOARD) # pin used START_BTN_PIN = 15 # pin on which the start button is connected PAUSE_BTN_PIN = 13 # pin on which the pause button is connected STOP_BTN_PIN = 33 # pin on which the start button is connected START_LED_PIN = 16 # pin on which the start led is connected PAUSE_LED_PIN = 18 # pin on which the pause led is connected STATE_LED_PIN = 8 # pin on which the state led is connected BUZZER_PIN = 35 # pin on which the buzzer is connected # pin configuration GPIO.setup(START_BTN_PIN, GPIO.IN) GPIO.setup(PAUSE_BTN_PIN, GPIO.IN) GPIO.setup(STOP_BTN_PIN, GPIO.IN) GPIO.pinMode(STOP_BTN_PIN, GPIO.PUD_UP) GPIO.setup(START_LED_PIN, GPIO.OUT) GPIO.setup(PAUSE_LED_PIN, GPIO.OUT)