International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2898 Solar energy based blockchain enabled health care monitoring using IoT Rishabh Khabya 1 , Shruti Goel 2 , Dr. Mangal Singh 3 1-3 Dept. of Electronics & Communication Engineering, Institute of technology, Nirma University, Gujarat, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - The Internet of Things (IoT) tends to transform our lives and make it more comfortable is an auspicious technology in which the heterogeneous devices having embedded sensors are connected to a single platform and these devices can then interact with each other. As the demand for IoT is increasing there is a need to connect enormous number of smart devices with each other. One of the major applications of IoT is smart health care. It involves numerous health sensors which collect data and transfer it to clouds. This requires huge amount of data to be transferred between devices, large connectivity, high security, and privacy. Another thing is all these sensing devices have limited lifetime. So, there is a need to provide constant power supply to all the IoT devices. Also, the demand for energy has increased exponentially and to satisfy our wants non-renewable resources are being sacrificed. These number of challenges are needed to be considered to complete our vision of global connectivity using IoT. So, to overcome all these challenges we have proposed a method in which solar energy is used to provide power supply to the sensors and for ensuring security of data blockchain can be used. In this paper we are measuring the body temperature using DHT11 sensor and heart rate using Pulse meter sensor. Then we have interfaced the NodeMCU and sensors with the IoT platform. In our case we have used the Thingspeak as our IoT platform. The data of each sensor has been uploaded on the field of our channel with every time stamp. So that user as well as doctor can see the condition of the patient. For ensuring security of data, we have proposed one block diagram which shows how blockchain can be used for storing data. Also, the power supply is given to NodeMCU through energy generated by solar panel. Key Words: IoT, Solar energy, Blockchain Technology 1. INTRODUCTION Rural health is the main issue in India, especially in developing countries where there is a broad urban disparity in the provision of medical care, where there are more than half a percentage of the population in rural areas. In rural areas, the infrastructure is inadequate and inadequate. In these areas. In these areas. Furthermore, diagnostic equipment is set up and maintained costly and demanding. Most people die of preventable diseases such as diarrhea, which are curable, the typhoid and measles. The number of people without essential access is about 1.7 billion in medicines. In the rural health sector, the major problems are low wages, lack of education and restricted access to services by village people. Several other innovations to map the vital signs of the human body were created in the last decade. Vital signs are the body's most calculated functions of profound significance. The four key indicators that medical practitioners and health professionals regularly track are body temperature, pulsation, respiration, rate, Blood pressure, saturation level of blood oxygen. With the increase in technological advancements in today’s era healthcare has also seen a rapid transformation from traditional hospitals to distributed patient centric approach. This became possible due to emerging technologies like IoT, communication technologies and blockchain etc. IoT is the connection of devices to a single platform i.e., internet. IoT has made human’s life easier and comfortable. IoT has in recent decades gained so much attention due to its widespread applications. Some of the applications where IoT find its use are smart healthcare, smart city, smart industry etc. Healthcare is one of the most fundamental needs of any human being. So, there is a constant focus by every country on providing the best healthcare facilities to every citizen. Due to this smart healthcare is gaining more attention because with the help of IoT treatment can be given to patient every time, anytime and anywhere. In one study it was said that 27% of the total deaths happen in India with no medical attention at the time of death. According to the Lancet Medical journal 3.6 million deaths took place all over the world due to lack of healthcare access. There are villages where people still don’t have access to healthcare facilities. People must rush to cities for their treatment and going for check up to a city every 3-4 months incurs huge cost. In this technological world there are situations where people die because for getting treatment from a medical specialist, they must travel long distances. But the emerging technology like IoT have helped in overcoming this limitation. For example, if a person lives in a village and he is suffering from diabetes then he doesn’t need to travel to city every time for his check-up. Sensor can be used to measure patient’s sugar level and this data can be transmitted to cloud where doctor can have access to this data. And if in case any emergency arises the patient can be alerted, and preventive measures can be taken. Now the problem is the patient’s data is highly sensitive and the sensors used have limited battery lifespan. So, to overcome these challenges in this paper we have proposed a method in which blockchain technology and solar energy can be used. In case of blockchain technology cryptographic function is used to ensure the security of data. Person connected to blockchain network can only access the