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Photoresistor on LOGO

10/20/2019 5:40 PM	Rate (0)
fenixas969 Posts: 14 Rating: (0)	Hello. Tell me please how to program a photoresistor in logo soft comfort? It can be connected to I1 and I2 using these inputs as AI1 and AI2? When it is dark, output Q1 should turn on when a signal appears on input I3. when it is light, Q1 output should not turn on. Thanks!
fenixas969 Posts: 14 Rating: (0)
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10/20/2019 6:17 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/19/2026 Posts: 36483 Rating: (4552)	Attached a PDF file with a circuit diagram for the connection of a photo resistor type "A 1060". The idea comes from a German blog: frickelzeugs.de The LDR is in series with a voltage divider. Parallel to the 4.7 kOhm resistor, the analog input of the LOGO! connected. The 24 VDC must be used for the LOGO! and the voltage divider be the same. With an analog threshold switch you can then set the threshold when the output should be switched. Attachment LDR A 1060.pdf (658 Downloads)

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This contribution was helpful to 1 thankful Users DmitryLakeev

12/7/2023 11:00 PM	Rate (0)
DmitryLakeev Posts: 44 Rating: (0)	Please tell me how you calculated the resistance of the resistors in the above diagram? I have a similar task, only the parameters of the photoresistor are different: Illuminated 160 kOhm Dimmed 3300 kOhm I counted the resistors 115 and 240 kOhm... now I’m tormented by doubts whether I think so.
DmitryLakeev Posts: 44 Rating: (0)
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12/8/2023 6:32 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/19/2026 Posts: 36483 Rating: (4552)	The voltage divider made up of R1 and R2 is calculated so that when the resistance value of the LDR is approximately 0 Ω, a voltage of 10V drops across R2. The internal resistance of the analog input of the LOGO also needs to be taken into account.

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