GPIO connect Relay not working

[JasonWu 0]

Dears:

 

When I try to connect the Relay through the GPIO pin, pulling the pin high or low has no effect. The same connection method is completely normal on the Raspberry Pi 4.

pin use 39 & 40 

[yi-hsin_hung 3]

Hi @JasonWu:

     Nice to meet you. Could you help to provide the test steps and the information of relay device to us!

I think the 39 (GND) should has effect for relay. Maybe you could also try 1 pin (3.3v) for your relay.

Thank a lot!

[JasonWu 0]

Dear Sir:

Python Code On Asus Tinker Board 2....

Asus Tinker Board 2   device connect :

 

[JasonWu 0]

Dear Sir:

on the Raspberry Pi 4

Python Code:

Device Connect:

GPIO  ReadAll Status:

1、Not Running Code:

2、Running Code:

[JasonWu 0]

Dear Sir:

Asus Tinker Board 2 

GPIO ReadAll Status:

1. not running code:

2. running python code:

[yi-hsin_hung 3]

Hi @JasonWu:

     Excuse me! Didn't you connect any device to 40 pin and then the pin status can change normally by gpio readall?

I  look your code to pull low the 40 pin from your picture.

The GPIO.output(SEEP, GPIO.LOW) should let the 40 pin to low. Did RPI4 GPIO.output(SEEP, GPIO.LOW)  let the value to high?

Thank a lot!

[JasonWu 0]

Dear Sir:

Python Code  default set pin 40 is output .

first output pin 40 is High , then sleep 8 second , change to low 

on PRI 4 

But can't running on Asus Tinker Board 2S 

 

[yi-hsin_hung 3]

Hi @JasonWu:

    Please help to check the video(gpio40pin_python.MOV) test about 40 pin. The functions work normally on 2.0.4 version image.

Did you check whether the /boot/config.txt had set something for gpio 40 pin?

Thank a lot!

 

[JasonWu 0]

Hi Sir:

My /boot/config.txt  

Double Check my python code:

Now test again:

 

[yi-hsin_hung 3]

Hi @JasonWu:

     Could you help to remove the buzzer and then test again for gpio 40 pin? 

Thank a lot!

[JasonWu 0]

Hi Sir:

We just found out that if the relay switch is plugged in, it won't do anything
Removed the wiring for pin40. At this point test buzzer.py that its gpio readall is correct.

if relay switch connect 38 or 40 pins. always ..is 0 can't use.

[yi-hsin_hung 3]

Hi @JasonWu

     Excuse me! Did you know which pins can work normally with Buzzer relay device?

Thank a lot!

[JasonWu 0]

Dear Sir:

We know, we have two sets of devices on our hands.
One is Raspberry Pi and one is Tinker Board 2
Connect a set of Buzzer relay devices to each. Only Tinker Board 2 cannot be used.

I have tried other Tinker Board 2s on hand, but none of them can be used.

[JasonWu 0]

[JasonWu 0]

Dear Sir:

1、Not running python code ....

2、Running Python Code....

3.  We suspect that the GPIO voltage is insufficient. The GPIO voltage of the Raspberry Pi is the normal output 3.3

[JasonWu 0]

Dears:

We went to buy a different relay switch today for testing.
Now it works fine.

[yi-hsin_hung 3]

Hi @JasonWu:

     Have nice day! Thank you for your test. I think it's a compatible question with some hardware devices.

Maybe you can change the relay for your project on Tinker Board 2 at first.

Thank a lot!