Radio modules for arduino JDY-40

Greetings to all. In the open spaces of aliexpress I came across another Chinese creation, from the section "Wireless modules for arduino". Earlier, similar modules with similar capabilities for such small money did not come across to me. So I decided to review this module. Perhaps someone will interest him. We will talk about the low-power transceiver JDY-40, operating at a frequency of 2.4 GHz. It is very simple to work with the module, to configure the module, AT commands are used that are transmitted via USART.

In detail about the features of the module, you can learn from the video. I took the video for this very purpose, writing big texts is not my strong point. But if in brief, it is possible to conditionally divide the work of the module into two modes.

The first mode is the serial port mode.

This mode allows you to exchange any data wirelessly between microcontrollers using USART. The maximum data transfer rate that the module can provide is 19,200 bits per second.

At a speed of 9,600 bps, the line-of-sight distance at maximum power is about 100 meters. But if the modules are placed in different rooms, the stable connection, even through the walls, will remain at a distance of 15 meters.

Second mode

At the periphery of the module is available one eight-bit I / O port, with which you can interact. The module port can be used in the radio control mode, I will call it that. The advantage of this mode of operation is that the module interacts with the port without the participation of the microcontroller. For me, this is interesting because using two modules, you can assemble a simple and inexpensive radio control for models. Pressed the button - the machine went, let go - stopped. The behavior of the findings can be pre-registered.