Please tell me how to change the a02yyuw mode.
Norio.Kai 2026-05-01 11:09:31 598 Views5 Replies I purchased and am using three a02yyuw devices. It might be a coincidence, but all three devices I purchased will not respond unless I include mySerial.write(0x55) in the code. Is it possible to change this mode to automatic mode?
Dear Yx,
Thank you for your message.
I tried it, but it seems no data is being transmitted.
The sticker on the unit says A02YYT, so I suspect it's the model number for the UART control mode.
I apologize for the late reply.
Dear Yx,
Thank you for your message.
I tried it, but it seems no data is being transmitted.
The sticker on the unit says A02YYT, so I think it's probably the model number for the UART control mode.
I apologize for the late reply.
I'm sorry, I sent it without translating. I'll send it again.
Norio.Kai Hi, could you please confirm your purchase channel?
Normally, sensors bought from DFRobot official channels should be A02YYUW (SEN0311), not A02YYT.
These two are different hardware models with fixed working modes, and their modes cannot be switched mutually.
Hi, the A02YYUW (SEN0311) is factory-set to automatic continuous output mode by default, requiring no 0x55 trigger command.
Please try disconnecting the sensor's RX pin from your MCU (leave it floating or pull it up), then power it on again. Use a serial monitor to listen to the TX pin – it should output data continuously after power-up.
Yx Yx様
ご連絡ありがとうございます。
試してみましたが、データは流れてこないようでした。
本体のシールにA02YYTと書いてあるので、おそらくUART制御モードの型番のような気がしています。
私からの返信が遅くなってすみません。
