How to convert light activated switch into dark activated switch [duplicate]

Question

Can anyoe teach me how to convert this into light activated switch (https://i.stack.imgur.com/r6lZH.jpg)

Can anyone guide me how to convert this dark activated switch into light activated switch. Thank you — Delion, Jan 2, 2019 at 6:21
See duplicate : electronics.stackexchange.com/q/414449/152903 — Solar Mike, Jan 2, 2019 at 6:23

EasyOhm · Accepted Answer · 2019-01-02 06:34:18Z

0

Switch the LDR and 4.7K resistor.

answered Jan 2, 2019 at 6:34

EasyOhm

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\$\begingroup\$ Is that all? Thank you sir :) \$\endgroup\$
– Delion
Jan 2, 2019 at 6:37
\$\begingroup\$ Sir 4.7k or 47k? And which one? \$\endgroup\$
– Delion
Jan 2, 2019 at 6:42
\$\begingroup\$ 4k7 means a 4.7k resistor. \$\endgroup\$
– EasyOhm
Jan 2, 2019 at 18:14

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Electron · Accepted Answer · 2019-01-02 12:09:06Z

0

Pin 6 is floating.. connect pin 6 with pin 2. (By doing so you are connecting inverting and non-inverting comparator together.

and change the 4.7K resistor with 1M ohm variable resistor .

Slowly change the resistance and adjust the sensitivity based on your ambient light.

answered Jan 2, 2019 at 7:15

Electron

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2 Answers 2