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The device is assembled on common microcircuits MRF49XA from Microchip. Consists of a remote control and receivers. It is intended for ignition of pyrotechnic charges at carrying out of shows and holidays. Confident range of about 200 m in urban conditions (in the open field at times more). The operating frequency is 439 MHz, the power is about 50 mW. The console controls receivers, each of which is a single-command intercom module. Any receiver can be "sewn" to any button of the transmitter. The number of receiving modules can be much larger than 31. The peculiarity is that the receiving module can be "sewed" not only to a certain button of the console, but also to a combination of pressed buttons. Upon receipt of "its" code, the receiver for 1 second includes an executive power transistor key and thus sets a pyrotechnic match. The procedure of "registering" the receiving part with a specific button (or combination of buttons) of the transmitter is very simple. Note that the receiver will "prescribe" to itself in memory the code to which it will respond. Upon the supply of power, both to the receiver and to the remote, the devices enter the "test" mode for 3 seconds, then they are ready for operation. The test mode is necessary for a quick check of the operability of devices (using a scanner or, at a minimum, a simple wave meter). Both the receiver and the console are switched on for transmission 2 times for 1 second with a second pause. No code is transmitted, only the carrier frequency is generated. After that, they enter the operating mode and are ready for use. Programming Controllers ... Actually the Tx.HEX file is written using the program in the transmitter. The Rx.HEX file is written to the receiver. The receiver is thus "clean" and must be "sewed" to a certain transmitter bank (the procedure is described above). The transmitter has an individual number that can be changed from 00 to FF. Change the individual number manually via the programmer. The individual number of the remote control is located in the EEPROM at address 00. It can be left untouched while programming the controller, then it defaults to FF.




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The author of the pyrotechnic control (blaze):

Roman 2018





ID Name Designator Footprint Quantity Mounted
1 100u C2 CASE-B_3528 1 Yes
2 10MHZ X1 OSC-49S-1 1 Yes
4 ANT P2 HDR-1X1/2.54 1 Yes
5 330 R1 0805 1 Yes
6 2.54-1*2PFemale P3 HDR-1X2/2.54 1 Yes
7 470 R4 0805 1 Yes
8 100n C3,C4,C1 0805 3 Yes
9 LED-Yellow(0603) LED1 LED-0603 1 Yes
10 PIC16F887-I/PT U1 TQFP-44_10X10X08P 1 Yes
11 BFS540 Q1 SOT323 1 Yes
12 Switch,3*6*5Plastic head,260G, 0.25mm,SMD KEY1,KEY2,KEY3,KEY4,KEY5,KEY6,KEY7,KEY8,KEY9,KEY10,KEY11,KEY12,KEY13,KEY14,KEY15,KEY16,KEY17,KEY18,KEY19,KEY20,KEY21,KEY22,KEY23,KEY24,KEY25,KEY26,KEY27,KEY28,KEY29,KEY30 KEY-3.0*6.0 30 Yes
13 1mkH L5 CD32 1 Yes
14 47nH L1,L2,L3,L4 0805 4 Yes
15 4.7p C5,C7,C8,C9 0805 4 Yes
16 22p C6 0805 1 Yes
17 330p C10 0805 1 Yes
18 10k R2,R3,R5,R6,R7,R8,R9,R10,R11,R12,R13,R14,R15,R16,R17,R26,R27,R28,R29,R30,R31,R32,R33 0805 23 Yes
19 MRF49XA U2 TSSOP-16 1 Yes


Filename Download
MRF49XA Pyrotechnic


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