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CJMCU-Arduino module temperature sensor thermocouple type K thermocouple module MAX6675
CJMCU-MAX6675
is a complex monolithic thermocouple digital converter, the internal
signal conditioning amplifier, 12-bit analog / digital converter
thermocouple cold junction compensation sensor and correction, digital
controller, an SPI compatible interface and an associated control logic.
CJMCU-MAX6675
has internal thermocouple signal is converted to a voltage compatible
with the ADC input channel signal conditioning amplifier, T and T-
inputs connected to the low noise amplifier A1, to ensure high accuracy
detection input, while the connecting wires and thermocouple isolate the source of interference. Thermocouple
output of thermoelectric power amplification by a low noise amplifier
A1, A2 and then through the voltage follower buffer after being applied
to the input of the ADC. Before converting the temperature voltage value to a temperature value
equal to the price, the need for thermocouple cold junction temperature
compensation, cold junction temperature is the difference between the
MAX6675 ambient temperature 0 ℃ actual reference value.
Thermocouple
function is to detect hot and cold ends of the temperature difference
between the thermocouple hot junction temperature can be 0 ℃ -1023.75 ℃
range. That
is the cold side installation CJMCU-MAX6675 board ambient temperature,
the temperature is varied within the range of 20 ℃ -85 ℃. When
the cold junction temperature fluctuations, MAX6675 able to accurately
detect the temperature of the hot end of the change. MAX6675
is compensated for detecting and correcting ambient temperature changes
by the cold end, the device can be ambient temperature detected by the
temperature inside the temperature compensation diode is converted to a
voltage, in order to generate the actual thermocouple temperature
measurements, MAX6675 output from the thermocouple and diode detector the output voltage measurement. The device's internal circuit diode voltage and the thermocouple voltage to ADC.
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