Hardware Reference
In-Depth Information
breakout board, the MISO, pin 74, is connected to the breakout board's data pin
(labeled DO). What about the Arduino Due's MOSI, Master Out-Slave In? The
MAX31855 is a read-only device, and as such, does not require any data from
the master. To simplify the design, this pin was voluntarily omitted. So how
does the MAX31855 know when to send information? This device automati-
cally prepares to send data when its slave select pin is driven low. Temperature
conversions and fault detection are done continuously when the MAX31855 is
not selected, and as soon as the MAX31855 is selected via slave select (as soon
as SS is driven low), the conversion process stops, and it begins to transmit data.
Figure 7-3:
Hardware layout image created with Fritzing
The K-type thermocouple is connected to the breakout board, but be care-
ful of the polarity. The Adafruit thermocouple cable and breakout board come
with complete documentation on how to connect. Only the tip should be used
to sense the temperature. If the cable is too long, do not put more than neces-
sary inside the device you want to get a temperature reading from. Leave the
rest of the cable outside.
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