What is the Rh factor? Detailed answer

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What is the Rh factor? Detailed answer

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What is the Rh factor?

When a person loses a lot of blood for one reason or another, his life can be saved by a blood transfusion. Another person's blood flows into the victim's circulatory system and replaces their own lost blood.

The first known blood transfusion was performed in 1677, when the blood of a lamb was poured into the veins of a dying boy. This boy was lucky and survived. We now know that the blood of lower animals is different from human blood, and its use in human transfusions involves great risk.

In 1940, another method of dividing blood into groups was discovered - depending on the Rh factor. This discovery was made in the course of experiments on rhesus monkeys, and therefore this phenomenon was called "rhesus". It has been found that with certain mixtures of blood, red blood cells rupture. This is due to the difference in the Rh factor. There are two types of human blood: Rh positive and Rh negative.

If blood from a Rh-positive person is transfused to a Rh-negative person, the latter will develop a disease when the same blood is transfused again. In rare cases (one in forty or fifty) from a father with a positive Rh and a mother with a negative, under certain conditions, a child is born with a blood disease.

Author: Likum A.

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Temperature sensor TMP107 22.11.2016

The new TMP107 temperature sensor supports up to 32 devices in series. A chain of TMP107 sensors is connected to the microcontroller via one single-wire UART interface.

Each sensor has a unique 5-bit address stored in electrically erasable programmable memory (EEPROM). The address is assigned during the auto assignment operation and is based on the position of each sensor in the chain. The transmission distance of the UART bus can be up to 300 meters. Data is transmitted between sensors using the proprietary SMAART Wire protocol.

The TMP107 provides maximum flexibility in use, allowing you to choose between low power consumption (e.g. when running on batteries) and high refresh rates for real-time applications.

The warning function of the TMP107 is implemented with two registers for storing programmable values for low and high temperatures. After each measurement, the temperature is compared with the values from these registers. When the specified range is exceeded, the sensor sends a corresponding signal, which can be processed by the microcontroller or displayed on the alarm warning LED.

The TMP107 is capable of reading temperature with a resolution of 0,015625°C and an accuracy of +-0,4°C in the range from -20°C to +70°C. This sensor is ideal for replacing NTC and PTC thermistors in applications requiring high measurement accuracy, such as industrial, medical, environmental, and grain storage temperature control systems.

The TMP107 is housed in a SOIC-8 package and is designed for use in a temperature range of -55°C to +125°C.

Features:

High accuracy:
+-0,4°C (max.) at -20°C to +70°C;
+-0,55°C (max.) at -40°C to +100°C;
+-0,7°C (max.) at -55°C to +125°C;
High resolution: 14 bits (0,015625°C);
UART-compatible wired SMAART interface;
Support up to 32 serial devices;
EEPROM for unique addressing, programmable values, general purpose data storage;
Continuous operation and shutdown mode to save energy;
Single conversion mode for energy saving;
Programmable warnings;
Temperature range: -55°C to +125°C;
Voltage range: 1,7 to 5,5V;
Chassis: SOIC-8.

Applications:

Refrigerators and refrigerating chambers;
Distributed temperature measurements;
Thermal protection of power supplies and batteries;
Servers and telecommunication systems;
Building automation;
Agricultural machinery;
Medical instruments;
Industrial systems.

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