Here, the
LM3909 LED flashing/oscillator circuit delivers a pulse when the voltage is applied to pins 5 and 4. Two ambient light sensors (ALS-PT19) in the two corners of the bullets, when the bullets are on the light stubs and the sensor acts as an open switch (T1 and T2) so that the power supply cannot enter the lamp circuit. When the ball strikes the stumps, the balls can float in the air and expose the sensors in the bales to the light and act as a closed switch (T1 and T2) when the battery bias voltage reaches the flashing circuit, the LED turns on alternately.
Sensor Bails Position
Cricket Stump flashing circuit This circuit contains IC1 LM3909, ALS-PT19 sensor, four red LEDs (5mm) and some passive components. It can be easily built and placed in small boxes without requiring more space. Use the CR927 battery or you can use a small battery cell to fit your Bails size.
Sensor and Circuit position in Stumps
Each stump is placed with the ALS-PT19 sensor and the switch for the LM3909 flashing/oscillator IC. Two bales are placed on the top of the stumps to cover three stumps if the light sensor (ALS-PT19) is not lit, so it will respond as an open switch and the LEDs will be off.
If the ball touches the stump, the balls can float in the air, so there are several ways that the light sensor is exposed to light, so the light sensor responds like a closed switch, this circuit gets the polarization and generates a pulse the LEDs connected to the output light up alternately.
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