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GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Hi Kyle. I'm extremely new to these type of projects and my understanding is very limited at this stage and I apologize preemptively if my problem is a rookie one I'm learning and trying to be better.

Now I want to connect a simple 5v relay to control a fan. When i switch the relay ON through Mycodo- it "Activates" the relay but the rely doesn't physically change state and the state LED doesn't change either I've tested the relay with a arduino and it works just fine.

I know that the GPIO pins only produce a 3. I've unplugged and plugged the signal cable and it seems to activate as soon as it is connected Which makes me think the 3. Is there additional steps that I am missing?? I realy hope I've described my stupid problem and that the solution is a simple one. Don't worry about whether your questions are obvious or not. Ask anything you're unsure of. I've hooked up a single relay with another RPi to try and test it with basic gpio commands through terminal.

After a bit of "learning" and realizing the default raspian uses wPi numbering. I managed to set the pin state to output: "gpio mode 7 output" wich set BCM 4 to Output pin. And successfully blinked the LED with "gpio write 7 1; gpio write 7 0". I then connected the relay to the same pin and tried the same commands Which, in my mind, should work to switch the state of the relay. The State LED on the relay goes On, indicating to me that it is receiving a LOW signal and does absolutely nothing when I attempt to switch the signal with "gpio write 7 1.

The pickup voltage for yours should be 3. So, you're going to have to either increase the voltage or find a relay that can operate with 3. Does your arduino operate at 5 volts? I intend to get a different relay tomorrow so that I don't have to mess around with alternative circuit elements and power supplies ect. Is there a relay module that you would suggest?

Yes the arduino supplies a 5V signal. Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.

Sign up. New issue. Jump to bottom. Copy link Quote reply. I've managed to install Mycodo ver 6. I've connected a DHT22 sensor and have easily managed to setup graphs and readings ect. Kind regards HendoJ. I'll take a look at the specific relay you're using when I get home and get back to you. Thank you Kyle. Am I right to conclude this? Thank you for coming back to me I really appreciate it.

Awesome thank you. And thank you for the help as well!! You're welcome. It seems that is most likely the issue. Thanks a Mill Kyle! Really appreciate it! Lets hope I get it right tomorrow.

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JQC-3FF Datasheet

By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. Raspberry Pi Stack Exchange is a question and answer site for users and developers of hardware and software for Raspberry Pi. It only takes a minute to sign up. Above is relay I'm using and everything works as expected using diagram below. I understand such a question can sound silly for electrical engineer, but I'm software engineer venturing in electrical world and need some guidance.


T73 Relay JQC-3FF-S-Z 250vac/30vdc pcb 12v 10amp small relay

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Relay JQC-3FF-S-Z-5V - 5V coil, 10A / 250VAC contacts



HF(Xiamen Hongfa Electroacoustic) JQC-3FF/24VDC-1HS(551)


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