This is a simple circuit: PWM motor controller circuit using switch potentiometer
I want to turn the 555 IC on/off. But it didn't work.
How can I fix it?
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3\$\begingroup\$ Didn't work in reality or simulation? What does 'didn't work' mean? When MCU_GPIO is high the 555 still oscillates? \$\endgroup\$– Spehro PefhanyCommented Jun 5, 2023 at 7:35
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1\$\begingroup\$ Try making R? more like 10 kohm. \$\endgroup\$– Andy akaCommented Jun 5, 2023 at 7:44
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\$\begingroup\$ @Andy aka oh R? (1K) i changed 10K and it works! thank you! \$\endgroup\$– KimJiHoonCommented Jun 5, 2023 at 8:14
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\$\begingroup\$ @Antonio51 C3 is only connected 'CV' and 'GND' is this wrong? \$\endgroup\$– KimJiHoonCommented Jun 5, 2023 at 8:15
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\$\begingroup\$ @spehroPefhany in reality, i wired on board. when MCU_GPIO on 555 OFF \$\endgroup\$– KimJiHoonCommented Jun 5, 2023 at 8:20
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2 Answers
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This simple one seems to work.
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\$\begingroup\$ Is the VC pin connected directly to the gpio on the MCU? \$\endgroup\$ Commented Jun 5, 2023 at 7:57
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\$\begingroup\$ No. Just a label to show the capacitor voltage. Just "rst" wired to MCU. \$\endgroup\$ Commented 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
