Error in network creation of Hyperledger Fabric network usin AWS blockchain templates for Hyperledger Fabric
Abhay last edited by
We are trying to build a blockchain-based solution for the forensic application of vehicular accidents. The accident data of the vehicle is stored to a blockchain network in hyperledger fabric, so that no one can tamper the data, only authenticated authorities who have access to the hyperledger fabric network ledger can access to it which we make use of the channel concept in the hyperledger framework.
So the data from the IoT device (currently we build an app to access data such as accelerometer, gyroscope and GPS from smartphones) is been transferred to the Hyperledger Fabric network. We try to create a Fabric network in the AWS blockchain template for Hyperledger Fabric. Then from this hyperledger fabric, all the organizations who are part of this network such as forensic, insurance, manufacturers etc, are the stakeholders who can access the data in the network via the channel (channels helps to bring abstractions ie each stakeholder will only know what is necessary for them).
So we try to create the blockchain network in AWS using Blockchain template for hyperledger fabric. The template for network creation is actually inside a cloud formation stack, which is a service provided by AWS, so we need to create the stack to create the network. Before creating this stack we need to create a VPC, EC2 instance, IAM roles and policies. So we follow according to the below youtube video to create it.
After completing all the above prerequisite, we need to create the template inside the stack. Inside the stack we need to provide stack with the name of the stakeholders in the network ie, forensic, manufacturers etc.. Name of the VPC, EC2 instance ID, all the prerequisite details we created earlier.
When clicking the create a stack, it takes some time to create it, after some time it shows the stack is getting failed and getting rollback, there will be two stacks one is a nested stack of the parent stack, which contains all the artefacts for the hyperledger fabric network it is one which gets failed first, then the parent stack which contains the link to the EC2 instance.
screenshot of the error
Integration part ie transferring data and accessing ledger can be done only after this stack creation and network spun up.
Abhay last edited by
We try to find more about the error so far this is what we got from it.
So we run user data commands inside instance via SSH. Then error popped up when we run command for network artefacts.
@milanvarghese No, the battery comes into the play only if there is no power from the solar cell. It's like inverters in our home. They activate only if main power is gone, rest of the time they keep charging. similarly here the direct power will be coming from the solar cell, only if the solar cell can't produce enough voltage battery comes into the loop and starts providing voltage to our circuit.
@kowshik1729 I have seen this, but doesnt it damage that battery? dischargeing and charging at the same time?
@milanvarghese Basically you have cited the solution to your question. yes, you can run the Arduino microcontroller from a solar panel with some protection circuitry in between. There are many tutorials and blogs out there. You can start with something as following.
Hello I am working on a project using nodemcu.
In my home for years every day, someone has to walk up to the terrace of the house to check the water level and then turn the motor on/off.
I am planning to read the water levels in the tank using an ultrasonic sensor and push data into the cloud so that we don't need to go to the terrace to check the water level.
I would like my nodemcu module to run infinitely all the time using solar power. I have an old solar panel at home which is left unused and was used to charge a solar lamp. What other things do I need to implement this project? what battery should I use?
How do I implement this project?
@Mennyt The general right angled header pins are the cheapest option. Something like this https://robu.in/product/2-54mm-2x20-right-angle-male-header-strip-pack-of-2/?gclid=CjwKCAiA4o79BRBvEiwAjteoYDcmnOSwTUviMZzRBeHz_aENF_fQgj3BrKXAzYs6GIHknHSOJ4_2KhoC1fAQAvD_BwE