Radio alarm for hunters. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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The device is intended for "lazy" hunters. It signals via radio channel about the movement of the animal in the controlled area. An order for such a device came from a boar hunter to learn about the activity of animals near the feeder.
The device (its circuit is shown in the figure) consists of a radio transmitter A1, a tone generator G1 and a control unit based on microcircuits DA1, DA2 and transistors VT1-VT3. If there is movement in the controlled area, the IR sensor B1 is activated. With his signal, he starts a single vibrator on the DA1 chip, which turns on the radio transmitter A1, and a tone signal is transmitted on the air. The transmitter works all the time while the single vibrator pulse lasts (for the author - about 23 s). Simultaneously with the first, the second one-shot is launched - on the DA2 chip (its pulse duration is approximately 130 s), which blocks the B1 sensor. This is necessary in order to avoid constant operation of the transmitter when animals are active at the feeder, and is especially important if the radio beacon uses the same radio channel as the hunters' communications. In addition, battery power is saved. At the end of the second timer pulse, the device switches back to the waiting mode for a signal from the motion sensor.
The duration of pulses f and t2 (in seconds) of single vibrators on timers DA1 and DA2 is determined by approximate formulas:
t1 ~ 1,1R6C5; t2 ~ 1,1R7C6, where R6, R7 - resistance of resistors in megaohms; C5, C6 - capacitor capacitance in microfarads.
Together with a GB1 battery (voltage 12 V and capacity 7 Ah), the device is placed in a waterproof plastic case. An IR motion sensor B1, used in burglar alarm devices, is fixed on its front wall, an antenna WA1 is located on the upper wall, and a power switch SA1 and an XS1 connector for recharging the battery are located on the lower wall.
Author: M. Yakovlev
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