Bataron Posted yesterday at 07:36 PM Posted yesterday at 07:36 PM Hi dear readers!!! My name is Dima, I've been doing electronics, programming and PCB design in my spare time for more than 5 years. I have already finished several projects. But one of the latest projects may interest you. Recently I got interested in thermite compositions. And immediately came up with the idea to make a remote igniter for igniting transient compositions capable of igniting thermite mixture. Perhaps you have already faced the problem of finding and choosing an igniter for your pyrotechnic products. It is very important to have a safe, reliable, easy-to-use, compact, remote-controlled ignition device in the pyrotechnician's arsenal. For realization of the listed functions the complex Maple was developed. Maple is a hardware-software complex of radio ignition. The complex consists of a receiver and transmitter using LoRa modulation from Semtech. LoRa modulation allows to achieve high reliability of communication by providing noise immunity and communication range. photo of the complex Maple Security: - A number of safety measures have been taken on the transmitter side. Protection against accidental activation of the device (e.g. when worn in clothing or accidentally pressed during transportation). Protection against accidental pressing of the ignition lever - on the receiver side is implemented software protection against accidentally received packets, jammers, and packets intended for another addressee. Since Maple complex use digital packets for communication, it allows filtering the received data. The receiver compares the received data with the keys stored in the memory, which allows to uniquely identify the receiver and protect the igniter from random signals and interference signals. The communication range tests are summarized in the document below. Behind 2 iron-concrete buildings and a park area, in a city, it was possible to achieve satisfactory communication at a distance of 0.9 km from the transmitter. It is necessary to take into account that such a range was achieved at a very low transmitter power of 17dBm (0.05 W), which is 100 times less than the power of a normal portable amateur radio. But nobody forbids you to use a RF frequency power amplifier, which will significantly increase the ignition range. Reliability: Reliability is realized by a number of software functions of the Maple complex. On the receiver side is realized regular interval testing of the configuration state of the microcontroller and LoRa communication chip. In case of failures will be carried out measures to restore the functionality of the receiver. Also implemented recovery functions in case of hang-up and lack of internal testing. On the transmitter side, self-testing at power-up is implemented, and the reason for failure is indicated on the Oled display. Ease of use is achieved by the milimalistic design and the display of the required information. As well as intuitive operation. The possibility of using different antenna connectors of the receiver allows you to achieve a convenient installation of the receiver depending on the use. Standard provided for the installation of connectors IPEX1 and SMA. Although I soldered an antenna with a thin coaxial cable in place of the SMA connector. Range tests of the complex Video presentation If you are interested in the Maple complex, these documents provide more details. 1.Description.pdf 2.User's Manual.pdf The project is at the working and tested prototype stage. I am now trying to somehow make this device available to everyone. There is still a lot of classified information, but I promise to open everything and make it available to everyone, including circuit diagrams, detailed assembly instructions, source code and test code that I used after soldering, 3d models of the case, BOM and links where I bought, GERBER PCB files and maybe something else interesting that I don't know about yet. All of this with my detailed explanation that will allow people with no knowledge in programming and electronics to make the Klen complex on their own. Please write what you think about this project. Is it interesting to you?
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