How to use the NRF24L01 module with Arduino

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Having two or more Arduino boards be able to communicate with each other wirelessly over a distance opens lots of possibilities like remotely monitoring sensor data, controlling robots, home automation and the list goes on. A good, reliable and inexpensive solution is NRF24L01.

The NRF24L01+ is a newer version of the NRF24L01, capable of doing an extra 250kbps of on-air data rate while the one without “+” has only 1Mbps and 2Mbps. Both versions can be mixed together as long as 1 or 2 MBps is being used as the data rate.

Domain Driven Design: Layers

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Creating applications that can handle very complex tasks requires separation of code by using directory structures, layers and boundaries. This is where the concept of a Layered Architecture comes in. Projects developed with the Domain Driven Design approach has the following layers: domain, application, infrastructure and user interface (UI).

Paypal IPN: Instant Payment Notification

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Instant Payment Notification (IPN) is a message service that notifies you of events related to PayPal transactions. You can use IPN messages to automate back-office and administrative functions, such as fulfilling orders, tracking customers or providing status and other transaction-related information.

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