def __init__(self):
TempSensor.__init__(self)
self.sleeptime = self.time_step / float(
config.temperature_average_samples)
self.bad_count = 0
self.ok_count = 0
self.bad_stamp = 0
if config.max31855:
log.info("init MAX31855")
from max31855 import MAX31855, MAX31855Error
self.thermocouple = MAX31855(config.gpio_sensor_cs,
config.gpio_sensor_clock,
config.gpio_sensor_data,
config.temp_scale)
if config.max31856:
log.info("init MAX31856")
from max31856 import MAX31856
software_spi = {
'cs': config.gpio_sensor_cs,
'clk': config.gpio_sensor_clock,
'do': config.gpio_sensor_data,
'di': config.gpio_sensor_di
}
self.thermocouple = MAX31856(
tc_type=config.thermocouple_type,
software_spi=software_spi,
units=config.temp_scale,
ac_freq_50hz=config.ac_freq_50hz,
)
def test_get_internal_temperaure_reading(self):
'''Checks to see if we can read a temperature from the board, using Hardware SPI
'''
_logger.debug('test_get_internal_temperature_reading()')
# Raspberry Pi hardware SPI configuration.
SPI_PORT = 0
SPI_DEVICE = 0
sensor = MAX31856(spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE))
temp = sensor.readInternalTempC()
if temp:
self.assertTrue(True)
else:
self.assertTrue(False)
def test_get_internal_temperaure_reading(self):
'''Checks to see if we can read a temperature from the board, using Hardware SPI
'''
_logger.debug('test_get_internal_temperature_reading()')
# Raspberry Pi hardware SPI configuration.
spi_port = 0
spi_device = 0
sensor = MAX31856(hardware_spi=SPI.SpiDev(spi_port, spi_device))
temp = sensor.read_internal_temp_c()
if temp:
self.assertTrue(True)
else:
self.assertTrue(False)
def test_hardware_SPI_initialize(self):
'''Checks to see if the sensor can initialize on the hardware SPI interface.
Will fail if it cannot find the MAX31856 library or any dependencies.
Test only checks to see that the sensor can be initialized in Software, does not check the hardware connection.
'''
_logger.debug('test_hardware_SPI_initialize()')
# Raspberry Pi hardware SPI configuration.
SPI_PORT = 0
SPI_DEVICE = 0
sensor = MAX31856(spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE))
if sensor:
self.assertTrue(True)
else:
self.assertTrue(False)
def test_get_internal_temperaure_reading_k_type(self):
"""
Checks to see if we can read a temperature from the board, using Hardware SPI, and K type thermocouple
"""
_logger.debug('test_get_internal_temperature_reading()')
# Raspberry Pi hardware SPI configuration.
spi_port = 0
spi_device = 0
sensor = MAX31856(hardware_spi=SPI.SpiDev(spi_port, spi_device),
tc_type=MAX31856.MAX31856_K_TYPE)
temp = sensor.read_internal_temp_c()
if temp:
self.assertTrue(True)
else:
self.assertTrue(False)
def test_get_register_reading(self):
'''Checks to see if we can read a register from the device. Good test for correct connectivity.
'''
_logger.debug('test_get_register_reading()')
# Raspberry Pi hardware SPI configuration.
SPI_PORT = 0
SPI_DEVICE = 0
sensor = MAX31856(spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE))
value = sensor._read_register(MAX31856.MAX31856_REG_READ_CR0)
for ii in xrange(0x00, 0x10):
# Read all of the registers, will store data to log
sensor._read_register(ii)
if value:
self.assertTrue(True)
else:
self.assertTrue(False)
def test_hardware_spi_initialize(self):
"""
Checks to see if the sensor can initialize on the hardware SPI interface.
Will fail if it cannot find the MAX31856 library or any dependencies.
Test only checks to see that the sensor can be initialized in Software, does not check the
hardware connection.
"""
_logger.debug('test_hardware_SPI_initialize()')
# Raspberry Pi hardware SPI configuration.
spi_port = 0
spi_device = 0
sensor = MAX31856(hardware_spi=SPI.SpiDev(spi_port, spi_device))
if sensor:
self.assertTrue(True)
else:
self.assertTrue(False)
def test_get_register_reading(self):
'''Checks to see if we can read a register from the device. Good test for correct
connectivity.
'''
_logger.debug('test_get_register_reading()')
# Raspberry Pi hardware SPI configuration.
spi_port = 0
spi_device = 0
sensor = MAX31856(hardware_spi=SPI.SpiDev(spi_port, spi_device))
value = sensor._read_register(MAX31856.MAX31856_REG_READ_CR0)
for ii in range(0x00, 0x10):
# Read all of the registers, will store data to log
sensor._read_register(ii) # pylint: disable-msg=protected-access
if value:
self.assertTrue(True)
else:
self.assertTrue(False)
def __init__(self):
TempSensor.__init__(self)
if config.max31855:
log.info("init MAX31855")
from max31855 import MAX31855, MAX31855Error
self.thermocouple = MAX31855(config.gpio_sensor_cs,
config.gpio_sensor_clock,
config.gpio_sensor_data,
config.temp_scale)
if config.max31856:
log.info("init MAX31856")
from max31856 import MAX31856, MAX31856Error
software_spi = {
'cs': config.gpio_sensor_cs,
'clk': config.gpio_sensor_clock,
'do': config.gpio_sensor_data
}
self.thermocouple = MAX31856(tc_type=config.thermocouple_type,
software_spi=sofware_spi,
units=config.temp_scale)
# Test file using ESP8266 with K-type temerature sensor (https://www.adafruit.com/product/270)
#
# Breakout Board: https://www.adafruit.com/product/3263
# Chip Datasheet: https://cdn-learn.adafruit.com/assets/assets/000/035/948/original/MAX31856.pdf
# SPI Tutorial: https://learn.adafruit.com/micropython-hardware-spi-devices?view=all
import machine
import time
import max31856
from max31856 import MAX31856
spi = machine.SPI(1, baudrate=5000000, polarity=0, phase=1)
cs = machine.Pin(15, machine.Pin.OUT)
cs.on()
t = MAX31856(spi, cs)
while True:
print('Temp: {} C (Junction: {} C)\n'.format(
t.read_temp_c(),
t.read_internal_temp_c(),
))
time.sleep_ms(1000)
def test_temperature_byte_conversions(self):
'''Checks the byte conversion for various known temperature byte values.
'''
_logger.debug('test_temperature_byte_conversions()')
#-------------------------------------------#
# Test Thermocouple Temperature Conversions #
byte2 = 0x01
byte1 = 0x70
byte0 = 0x20
decimal_temp = MAX31856._thermocouple_temp_from_bytes(
byte0, byte1, byte2) # pylint: disable-msg=protected-access
self.assertEqual(decimal_temp, 23.0078125)
# Check a couple values from the datasheet
byte2 = 0b00000001
byte1 = 0b10010000
byte0 = 0b00000000
decimal_temp = MAX31856._thermocouple_temp_from_bytes(
byte0, byte1, byte2) # pylint: disable-msg=protected-access
self.assertEqual(decimal_temp, 25.0)
byte2 = 0b00000000
byte1 = 0b00000000
byte0 = 0b00000000
decimal_temp = MAX31856._thermocouple_temp_from_bytes(
byte0, byte1, byte2) # pylint: disable-msg=protected-access
self.assertEqual(decimal_temp, 0.0)
byte2 = 0b11111111
byte1 = 0b11110000
byte0 = 0b00000000
decimal_temp = MAX31856._thermocouple_temp_from_bytes(
byte0, byte1, byte2) # pylint: disable-msg=protected-access
self.assertEqual(decimal_temp, -1.0)
byte2 = 0b11110000
byte1 = 0b01100000
byte0 = 0b00000000
decimal_temp = MAX31856._thermocouple_temp_from_bytes(
byte0, byte1, byte2) # pylint: disable-msg=protected-access
self.assertEqual(decimal_temp, -250.0)
#---------------------------------#
# Test CJ Temperature Conversions #
msb = 0x1C
lsb = 0x64
decimal_cj_temp = MAX31856._cj_temp_from_bytes(
msb, lsb) # pylint: disable-msg=protected-access
self.assertEqual(decimal_cj_temp, 28.390625)
# Check a couple values from the datasheet
msb = 0b01111111
lsb = 0b11111100
decimal_cj_temp = MAX31856._cj_temp_from_bytes(
msb, lsb) # pylint: disable-msg=protected-access
self.assertEqual(decimal_cj_temp, 127.984375)
msb = 0b00011001
lsb = 0b00000000
decimal_cj_temp = MAX31856._cj_temp_from_bytes(
msb, lsb) # pylint: disable-msg=protected-access
self.assertEqual(decimal_cj_temp, 25)
msb = 0b00000000
lsb = 0b00000000
decimal_cj_temp = MAX31856._cj_temp_from_bytes(
msb, lsb) # pylint: disable-msg=protected-access
self.assertEqual(decimal_cj_temp, 0)
msb = 0b11100111
lsb = 0b00000000
decimal_cj_temp = MAX31856._cj_temp_from_bytes(
msb, lsb) # pylint: disable-msg=protected-access
self.assertEqual(decimal_cj_temp, -25)
msb = 0b11001001
lsb = 0b00000000
decimal_cj_temp = MAX31856._cj_temp_from_bytes(
msb, lsb) # pylint: disable-msg=protected-access
self.assertEqual(decimal_cj_temp, -55)
def test_temperature_byte_conversions(self):
'''Checks the byte conversion for various known temperature byte values.
'''
_logger.debug('test_temperature_byte_conversions()')
#-------------------------------------------#
# Test Thermocouple Temperature Conversions #
byte2 = 0x01
byte1 = 0x70
byte0 = 0x20
decimal_temp = MAX31856._thermocoupleTempFromBytes(byte0, byte1, byte2)
self.assertEqual(decimal_temp, 23.0078125)
# Check a couple values from the datasheet
byte2 = 0b00000001
byte1 = 0b10010000
byte0 = 0b00000000
decimal_temp = MAX31856._thermocoupleTempFromBytes(byte0, byte1, byte2)
self.assertEqual(decimal_temp, 25.0)
byte2 = 0b00000000
byte1 = 0b00000000
byte0 = 0b00000000
decimal_temp = MAX31856._thermocoupleTempFromBytes(byte0, byte1, byte2)
self.assertEqual(decimal_temp, 0.0)
byte2 = 0b11111111
byte1 = 0b11110000
byte0 = 0b00000000
decimal_temp = MAX31856._thermocoupleTempFromBytes(byte0, byte1, byte2)
self.assertEqual(decimal_temp, -1.0)
byte2 = 0b11110000
byte1 = 0b01100000
byte0 = 0b00000000
decimal_temp = MAX31856._thermocoupleTempFromBytes(byte0, byte1, byte2)
self.assertEqual(decimal_temp, -250.0)
#---------------------------------#
# Test CJ Temperature Conversions #
MSB = 0x1C
LSB = 0x64
decimal_CJ_temp = MAX31856._cjTempFromBytes(MSB, LSB)
self.assertEqual(decimal_CJ_temp, 28.390625)
# Check a couple values from the datasheet
MSB = 0b01111111
LSB = 0b11111100
decimal_CJ_temp = MAX31856._cjTempFromBytes(MSB, LSB)
self.assertEqual(decimal_CJ_temp, 127.984375)
MSB = 0b00011001
LSB = 0b00000000
decimal_CJ_temp = MAX31856._cjTempFromBytes(MSB, LSB)
self.assertEqual(decimal_CJ_temp, 25)
MSB = 0b00000000
LSB = 0b00000000
decimal_CJ_temp = MAX31856._cjTempFromBytes(MSB, LSB)
self.assertEqual(decimal_CJ_temp, 0)
MSB = 0b11100111
LSB = 0b00000000
decimal_CJ_temp = MAX31856._cjTempFromBytes(MSB, LSB)
self.assertEqual(decimal_CJ_temp, -25)
MSB = 0b11001001
LSB = 0b00000000
decimal_CJ_temp = MAX31856._cjTempFromBytes(MSB, LSB)
self.assertEqual(decimal_CJ_temp, -55)
sensor3_internal = []
sensor3_external = []
# Uncomment one of the blocks of code below to configure your Pi to use software or hardware SPI.
# Raspberry Pi software SPI configuration.
# software_spi = {"clk": 13, "cs": 5, "do": 19, "di": 26}
# sensor = MAX31856(software_spi=software_spi)
# software_spi2 = {"clk": 13, "cs": 6, "do": 19, "di": 26}
# sensor2 = MAX31856(software_spi=software_spi2)
# Raspberry Pi hardware SPI configuration.
SPI_PORT = 0
SPI_DEVICE = 0
sensor = MAX31856(avgsel=2,
hardware_spi=Adafruit_GPIO.SPI.SpiDev(SPI_PORT, SPI_DEVICE))
SPI_PORT = 0
SPI_DEVICE = 1
sensor2 = MAX31856(hardware_spi=Adafruit_GPIO.SPI.SpiDev(SPI_PORT, SPI_DEVICE))
sensor3 = MAX31856(software_spi={'clk': 13, 'cs': 5, 'do': 19, 'di': 26})
def write_temp(timestamp, temp, internal, temp2, internal2, temp3, internal3):
with open("temp.csv", "a") as log:
log.write("{0},{1!s},{2!s},{3!s},{4!s},{5!s},{6!}\n".format(
timestamp, temp, internal, temp2, internal2, temp3, internal3))
def graph():
