not read
![userHead](https://dfimg.dfrobot.com/dfPortrait2.png)
Hello
i tried the device in both UART and I2C on arduino uno and esp32 the light flashes and changes colour and always gives me null as a value what can i do?
2023-05-22 17:22:50 ![Gravity:Ring 2D QR Code Scanner](https://image.dfrobot.com/image/data/SEN0486/Connection-Diagram.png)
![](https://dfimg.dfrobot.com/nobody/makelog/1f1615a18e4e3c78955e0b644cfd0393.png)
![](https://dfimg.dfrobot.com/nobody/makelog/78b4e93071a59547952bb757b64e71d7.png)
Intekai
I use arduino uno rev. 3 with this configuration
![Gravity:Ring 2D QR Code Scanner](https://image.dfrobot.com/image/data/SEN0486/Connection-Diagram.png)
i have this danger in monitor
![](https://dfimg.dfrobot.com/nobody/makelog/1f1615a18e4e3c78955e0b644cfd0393.png)
and this in serial monitor
![](https://dfimg.dfrobot.com/nobody/makelog/78b4e93071a59547952bb757b64e71d7.png)
![userHeadPic](https://dfimg.dfrobot.com/dfPortrait2.png)
2023-05-22 10:22:30 ![](https://dfimg.dfrobot.com/nobody/makelog/f1170d2da7a003bc6a7f3d171ece6739.png)
jenna
Turn the DIP switch of the adapter board to UART, and the setting will take effect after powering on again.
Code System:- 1D: EAN13, EAN8, UPCA, UPCE0, UPCE1, Code128, Code39, Code93, CodeBar, Interleaved 2 of 5- 2D: QR code, Data Matrix, PDF417
![](https://dfimg.dfrobot.com/nobody/makelog/f1170d2da7a003bc6a7f3d171ece6739.png)
![userHeadPic](https://dfimg.dfrobot.com/dfPortrait2.png)
Intekai
wrote:
2023-05-22 12:04:43 1 Replies
I have changed it but not work
2023-05-20 22:34:24
Intekai
i have used this instruction with Arduino UNO
https://wiki.dfrobot.com/SKU_SEN0486_Gravity_Ring_2D_QR_Code_Scanner
but not read
![userHeadPic](https://dfimg.dfrobot.com/dfPortrait2.png)