DFROBOT SEN0440 no device!
shim.hyeongjun 2023-07-13 18:13:04 439 Views6 Replies I'm adjusted the baud rate to 115200
It comes out as no device as shown in the picture below
“How to Scan I2C Address in Arduino - Hackster.io：https://www.hackster.io/abdularbi17/how-to-scan-i2c-address-in-arduino-eaadda”
this is very helpful to me. I just followed your instruction and it seems no problem with connection.
Is it normal to get 0.0 ppm from both sensors inside the office in general?
sanghoon.lee Hi!
If none of these dangerous gases are in your office, I think it's normal for the sensor to get 0 ppm.
Hi!
As shown in the picture above, I purchased three sensors, sen0470 , sen0467, and sen0231, and connected each sensor to Arduino UNO according to your online instructions.There is only a message "No Device!" message. Can you give any advice?
sanghoon.lee Hi!
1.pls check whether the position of the dial switch SEL is 0. After switching the switch, please power it on again for the settings to take effect.
You can try to use the I2C mode of the sensor, through the I2C example, you can get the address of the sensor. If the sensor cannot be scanned, it is likely that the circuit has poor contact.
How to Scan I2C Address in Arduino - Hackster.io：https://www.hackster.io/abdularbi17/how-to-scan-i2c-address-in-arduino-eaadda
2.The usage of sen0470 and sen0467 is the same.
3.It is recommended to test each sensor individually, giving the sensors some time to warm up while testing.
Hi!
Please use a multimeter to check the soldering connections and wires. The operating voltage of the sensor is 4.9 to 5.1V DC, so ensure that the power supply meets the requirements. This error typically occurs in faulty circuits, such as loose connections.
jenna 
