def __init__(self, scl, sda, gain=1):
self.i2c = busio.I2C(scl, sda)
self.ads = ADS.ADS1115(self.i2c)
self.channel = analog_in.AnalogIn(self.ads, ADS.P0, ADS.P1)
self.ads.gain = gain
self.gain_options = [2 / 3, 1, 2, 4, 8, 16]
def __init__(self, ads=None):
if ads is None:
if not adc is None:
ads = adc
else:
try:
if ADS_TYPE == 1015:
ads = ads1015.ADS1015(board.I2C(),
gain=ADC_GAIN,
address=ADC_ADDR)
else:
ads = ads1115.ADS1115(board.I2C(),
gain=ADC_GAIN,
address=ADC_ADDR)
# except (OSError, ValueError) as err:
except:
print("[LevelSensor] No ADS1x15 breakout detected!")
ads = None
super().__init__(analog_in.AnalogIn(ads, LevelSensor.L_PIN))
self.history = [0.0] * NSAMPLES
self._sampleCnt = 0
self._idx = 0
if WARM_UP_LEVEL_SENSOR:
for i in range(NSAMPLES * 3):
self._level = self.readSensor()
if PRINTS_ON:
print('.', end='')
time.sleep(1)
if PRINTS_ON:
print('\n=== SENSORS INITIALIZED ===\n')
def __init__(self, ads=None):
if ads is None:
if not adc is None:
ads = adc
else:
try:
if ADS_TYPE == 1015:
ads = ads1015.ADS1015(board.I2C(),
gain=ADC_GAIN,
address=ADC_ADDR)
else:
ads = ads1115.ADS1115(board.I2C(),
gain=ADC_GAIN,
address=ADC_ADDR)
except:
print("[PHSensor] No ADS1x15 breakout detected!")
ads = None
super().__init__(analog_in.AnalogIn(ads, PHSensor.P_PIN))
def measure(func):
# var list reqd.
global GAIN
global curState
global thresh
global P
global T
global stateChanged
global sampleCounter
global lastBeatTime
global firstBeat
global secondBeat
global Pulse
global IBI
global rate
global amp
global lastTime
# read from the ADC
signal = analog_in.AnalogIn(adc, ads.P0).value # get input from channel a0
curtime = int(time.time() * 1000)
sampleCounter += curtime - lastTime # # keep track of the time in mS with this variable
lastTime = curtime
n = sampleCounter - lastBeatTime # # monitor the time since the last beat to avoid noise
# find the peak and trough of the pulse wave
if signal < thresh and n > (IBI / 5.0) * 3.0: # # avoid dichrotic noise by waiting 3/5 of last IBI
if signal < T: # T is the trough
T = signal # keep track of lowest point in pulse wave
if signal > thresh and signal > P: # thresh condition helps avoid noise
P = signal # P is the peak
# keep track of highest point in pulse wave
# NOW IT'S TIME TO LOOK FOR THE HEART BEAT
# signal surges up in value every time there is a pulse
if n > 250: # avoid high frequency noise
if (signal > thresh) and not Pulse and (n > (IBI / 5.0) * 3.0):
Pulse = True # set the Pulse flag when we think there is a pulse
IBI = sampleCounter - lastBeatTime # measure time between beats in mS
lastBeatTime = sampleCounter # keep track of time for next pulse
if secondBeat: # if this is the second beat, if secondBeat == TRUE
secondBeat = False # clear secondBeat flag
for i in range(0, 10): # seed the running total to get a realisitic bpm at startup
rate[i] = IBI
if firstBeat: # if it's the first time we found a beat, if firstBeat == TRUE
firstBeat = False # clear firstBeat flag
secondBeat = True # set the second beat flag
return # IBI value is unreliable so discard it
# keep a running total of the last 10 IBI values
running_total = 0 # clear the running_total variable
for i in range(0, 9): # shift data in the rate array
rate[i] = rate[i + 1] # and drop the oldest IBI value
running_total += rate[i] # add up the 9 oldest IBI values
rate[9] = IBI # add the latest IBI to the rate array
running_total += rate[9] # add the latest IBI to running_total
running_total /= 10 # average the last 10 IBI values
bpm = analog_in.normalise(60000 / running_total) # how many beats can fit into a minute? that's bpm!
func('bpm: {}'.format(bpm))
payload = {
"api_key": "M2QHPYFQQCMH9B0X",
'field1': bpm
}
requests.post("https://api.thingspeak.com/update", data=payload)
if signal < thresh and Pulse: # when the values are going down, the beat is over
Pulse = False # reset the Pulse flag so we can do it again
amp = P - T # get amplitude of the pulse wave
thresh = amp / 2 + T # set thresh at 50% of the amplitude
P = thresh # reset these for next time
T = thresh
if n > 2500: # if 2.5 seconds go by without a beat
thresh = 512 # set thresh default
P = 512 # set P default
T = 512 # set T default
lastBeatTime = sampleCounter # bring the lastBeatTime up to date
firstBeat = True # set these to avoid noise
secondBeat = False # when we get the heartbeat back
print("no beats found")
dl10 = LevelSensor()
while True:
try:
data = [get_ts(), dl10.level, dl10.voltage, dl10._value]
print(fstr.format(*data))
time.sleep(loop_delay)
except KeyboardInterrupt:
break
else:
from adafruit_ads1x15 import ads1015, analog_in
import board
adc = ads1015.ADS1015(board.I2C(), gain=(2 / 3), address=0x48)
dl10 = analog_in.AnalogIn(adc, 0)
ready = input("Press enter to begin test...")
while True:
try:
volts = dl10.voltage
mA = voltage_to_mA(volts)
# level = mA_to_level(mA)
# level = voltage_to_level(volts)
level = v_to_mA_to_level(volts)
data = [get_ts(), level, volts, dl10.value]
print(fstr.format(*data))
time.sleep(loop_delay / 2)
except KeyboardInterrupt:
break