UNIT Kmeter

SKU:U133

Description

UNIT Kmeter is a K-type thermocouple sensor with I2C communication interface. The hardware adopts ESP32-C3 main control + MAX31855KASA+T 14bit thermocouple digital conversion chip. The internal ESP32-C3 integrated firmware communicates with the thermocouple digital IC to process the raw data and expose the I2C interface. The user can easily obtain the processed temperature data. This product is specially designed for K-type thermocouples. The conversion chip supports thermocouple probes with a measuring range of -200°C to 1350°C, and adopts a general standard flat interface, which is convenient for subsequent replacement of different measurement probes with different ranges to match different needs. It is suitable for industrial temperature collection, monitoring and other scenes that have high requirements for temperature measurement range.

Product Features

ESP32-C3 (support I2C firmware update)
MAX31855KASA+T:
- 14Bit ADC
- 0.25°C resolution, accuracy ±2%
- Support probe type: K type
- Support the measurement range of the connected probe -200°C to 1350°C
I2C communication interface addr: 0x66

Include

1x Kmeter Unit
1x K-type thermocouple probe (measuring range -50°C to 250°C, wire length 1m)
1x HY2.0-4P cable (20cm)

Applications

Industrial temperature collection
Constant temperature control/monitoring scene

Specification

Specifications	Parameters
Thermocouple digital conversion IC	MAX31855KASA+T: 14Bit ADC, 0.25°C resolution, accuracy ±2%, support probe type: K type, support measurement range -200°C to 1350°C
Standard probe specifications	K-type thermocouple, measuring range -50°C to 250°C, line length 1m, thermal response time <1s, interface: standard flat copper plug
Communication protocol	I2C, device address: 0x66
Power consumption	5V@24mA
Net weight	9.3g
Gross weight	21g
Product size	56 * 24 * 9.6 mm
Packing size	93 * 138mm

PinMap

UNIT Kmeter

M5CORE - PORT A	G21	G22	5V	GND
Kmeter	SDA	SCL	VCC	GND

Schematic

Protocol

Protocol type I2C
I2C Address: 0x66

addr	data length	desc	return values
0x66	4Byte	thermocouple and internal temperature data	Byte[0] thermocouple_H Byte[1] thermocouple_L Byte[2] internal_H Byte[3] internal_L

calculate


thermocouple = (thermocouple_H << 8) + thermocouple_L;
internal = (internal_H << 8) + internal_L;

thermocouple_temp = 0.25f * (thermocouple >> 2);
internal_temp = 0.0625f * (internal >> 4);