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This is a simple circuit: PWM motor controller circuit using switch potentiometer

enter image description here

I want to turn the 555 IC on/off. But it didn't work.

How can I fix it?

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    \$\begingroup\$ Didn't work in reality or simulation? What does 'didn't work' mean? When MCU_GPIO is high the 555 still oscillates? \$\endgroup\$ Jun 5, 2023 at 7:35
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    \$\begingroup\$ Try making R? more like 10 kohm. \$\endgroup\$
    – Andy aka
    Jun 5, 2023 at 7:44
  • \$\begingroup\$ @Andy aka oh R? (1K) i changed 10K and it works! thank you! \$\endgroup\$
    – KimJiHoon
    Jun 5, 2023 at 8:14
  • \$\begingroup\$ @Antonio51 C3 is only connected 'CV' and 'GND' is this wrong? \$\endgroup\$
    – KimJiHoon
    Jun 5, 2023 at 8:15
  • \$\begingroup\$ @spehroPefhany in reality, i wired on board. when MCU_GPIO on 555 OFF \$\endgroup\$
    – KimJiHoon
    Jun 5, 2023 at 8:20

2 Answers 2

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This simple one seems to work.

enter image description here

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  • \$\begingroup\$ Is the VC pin connected directly to the gpio on the MCU? \$\endgroup\$
    – KimJiHoon
    Jun 5, 2023 at 7:57
  • \$\begingroup\$ No. Just a label to show the capacitor voltage. Just "rst" wired to MCU. \$\endgroup\$
    – Antonio51
    Jun 5, 2023 at 8:06
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I want to turn the 555 IC on/off. But it didn't work. How can I fix it?

Try making "R?" more like 10 kohm. – Andy aka

@Andy aka oh R? (1K) i changed 10K and it works! thank you! – KimJiHoon

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