Simple test¶
Ensure your device works with this simple test.
examples/max31856_simpletest.py¶
1# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
2# SPDX-License-Identifier: MIT
3
4import board
5import digitalio
6import adafruit_max31856
7
8# Create sensor object, communicating over the board's default SPI bus
9spi = board.SPI()
10
11# allocate a CS pin and set the direction
12cs = digitalio.DigitalInOut(board.D5)
13cs.direction = digitalio.Direction.OUTPUT
14
15# create a thermocouple object with the above
16thermocouple = adafruit_max31856.MAX31856(spi, cs)
17
18# print the temperature!
19print(thermocouple.temperature)
Thresholds and Fault example¶
Example showing how to use thresholds
examples/max31856_thresholds_and_faults.py¶
1# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
2# SPDX-License-Identifier: MIT
3
4import time
5import board
6import digitalio
7import adafruit_max31856
8
9# Create sensor object, communicating over the board's default SPI bus
10spi = board.SPI()
11
12# allocate a CS pin and set the direction
13cs = digitalio.DigitalInOut(board.D0)
14cs.direction = digitalio.Direction.OUTPUT
15
16# create a thermocouple object with the above
17thermocouple = adafruit_max31856.MAX31856(spi, cs)
18
19# set the temperature thresholds for the thermocouple and cold junction
20thermocouple.temperature_thresholds = (-1.5, 30.8)
21thermocouple.reference_temperature_thresholds = (-1.0, 30.5)
22current_faults = {}
23current_cj_thresholds = (0, 0)
24current_temp_thresholds = (0, 0)
25print(thermocouple.reference_temperature_thresholds)
26while True:
27 current_temp_thresholds = thermocouple.temperature_thresholds
28 current_cj_thresholds = thermocouple.reference_temperature_thresholds
29 current_faults = thermocouple.fault
30 print(
31 "Temps: %.2f :: cj: %.2f"
32 % (thermocouple.temperature, thermocouple.reference_temperature)
33 )
34 print("Thresholds:")
35 print("Temp low: %.2f high: %.2f" % current_temp_thresholds)
36 print("CJ low: %.2f high: %.2f" % current_cj_thresholds)
37 print("")
38 print("Faults:")
39 print(
40 "Temp Hi: %s | CJ Hi: %s"
41 % (current_faults["tc_high"], current_faults["cj_high"])
42 )
43 print(
44 "Temp Low: %s | CJ Low: %s"
45 % (current_faults["tc_low"], current_faults["cj_low"])
46 )
47 print(
48 "Temp Range: %s | CJ Range: %s"
49 % (current_faults["tc_range"], current_faults["cj_range"])
50 )
51 print("")
52 print(
53 "Open Circuit: %s Voltage Over/Under: %s"
54 % (current_faults["open_tc"], current_faults["voltage"])
55 )
56 print("")
57
58 time.sleep(1.0)