Using relay on solenoid lock

Projects General Guidance
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I'm currently working on a Rfid door lock project using Arduino UNO, an LCD LM016l with I2C, an RFID sensor, 2 LED, a buzzer, a HW482 relay module and a solenoid lock.

The working principle is, when I touch correct RFID card on the sensor, the solenoid lock will lock or unlock, and the LED will grow. When I touch the incorrect card, the solenoid lock won't respond, but LED will grow and sound will be produced from buzzer.

The problem is, before I install relay module and solenoid lock, my concept works perfectly fine. Once I install relay module and solenoid lock, when I try to trigger solenoid lock using RFID card, first it works fine. However, I have to manually retract the solenoid lock. When I use correct RFID card again, solenoid is expanded, but LCD won't display correct characters and the system won't respond when I want to touch the RFID card again.

For the connection in relay module, I connected the relay module from normally open position to VIN in arduino UNO and 9V battery to the arduino UNO. Then I connected the common in relay module to the solenoid.

Is there any method to troubleshoot this problem? Thank you very much.

1 Like
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Try a better power source... a 9v battery can't provide enough current to drive the types of devices you are using.

2 Likes
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Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project.

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I'll try this solution once my new components arrive and let you know later on. Thank you.

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Also make sure that, your code does not contains long delay that can block other operation in a period of time

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Hi, @jennseu
Welcome to the forum.

Can you please post a copy of your code and a copy of your schematic, including power supplies, component names and pin labels?

Thanks.. Tom.. :smiley: :+1: :coffee: :australia:

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