![Relay won't trip. In the picture below you can see I'm providing an input to the relay (LED is on) from the Arduino. 12v via a 12v power brick and I get Relay won't trip. In the picture below you can see I'm providing an input to the relay (LED is on) from the Arduino. 12v via a 12v power brick and I get](https://i.redd.it/hl8g1x2jweq81.jpg)
Relay won't trip. In the picture below you can see I'm providing an input to the relay (LED is on) from the Arduino. 12v via a 12v power brick and I get
![12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables 12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables](https://content.instructables.com/FT3/18OD/J0IEL7L2/FT318ODJ0IEL7L2.png?auto=webp)
12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables
![opto isolator - Modification to Arduino 12V Detection Circuit - Electrical Engineering Stack Exchange opto isolator - Modification to Arduino 12V Detection Circuit - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/QeGhn.png)
opto isolator - Modification to Arduino 12V Detection Circuit - Electrical Engineering Stack Exchange
![12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables 12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables](https://content.instructables.com/FHP/7D7T/J0IEKT2L/FHP7D7TJ0IEKT2L.png?auto=webp&frame=1&width=320&md=31b7678387eac6b6b542def2981fdf86)
12V Motor Control With 5V Arduino and NPN Transistor As Speed Control Switch : 4 Steps - Instructables
![opto isolator - Modification to Arduino 12V Detection Circuit - Electrical Engineering Stack Exchange opto isolator - Modification to Arduino 12V Detection Circuit - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/roxPH.png)
opto isolator - Modification to Arduino 12V Detection Circuit - Electrical Engineering Stack Exchange
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For arduino Nano Terminal Expansion Board Adapter IO Shield Electronic Circuit 328P w/XBEE nRF24L01 Socket Interface 7 12V Input|Integrated Circuits| - AliExpress
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Arduino Power Module DC 12V to 3.3V 5V Arduino Power Module 3.3V 5V 12V Multi Output Voltage Conversion for Arduino : Amazon.de: Business, Industry & Science
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