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The moment the circuit is switched on, the led always flashes, what reason is how to solve!

Hardware design
June 23, 2020 by Terry Wells 2278

In the circuit, OT-V1 is connected to PS2801-4, and then it is connected to STM32 to control on and off. Every time the circuit is switched on and off, the LED always flashes and then goes out. Why?How to solve ?

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sudhakaran Posted on June 23, 2020

V1 point a resistance to the ground, select the appropriate resistance value, appropriate control to the best state.

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  • Sakchai Tantapong

    Sakchai Tantapong Posted on June 23, 2020

    yes, this answer is correct 
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Jason Jiang Posted on June 23, 2020

Since OT-V1 has no default level, the audion is easy to be interfered. Next, it is pulled down by default to make the audion not conducting by default and will not light up

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