thanks . i also showed how to get data from ds18b20 using normal usb ttl adapter, without using any microcontroller. may be that might be of your interest.
hi, if you don't use the resistor what will happen, I have mines setup with a 10k but the temp is off 10 degrees. do you have any idea why I am off so much degrees? I am using the DHT22 with 3.3V. also can this be power by only by 3.3v or it can be power by 5v?
Input pins are high impedance and essentially open circuit as far as loading goes. Without some load at the end of the line all of your interconnecting wire will act as an antenna and that "hum" will be added to the dc voltage you want to read giving you very inaccurate readings. In the industrial setting we don't read many analog sensors as voltages but as closed loop currents using the 4-20 format where the monitoring point converts it to a voltage and corrects for the 4mA representing a 0 reading. 10k resistor is to much, try a 4.7K resistor. DHT22 can be powered from 3.3 to 6v. If you use 3.3v you need to ensure that 3.3 is solid, doesn't drop, because if it goes under ~3.3v the internal thermistor will fail to read properly. I strongly recommend you to hookup a 100nF capacitor between sensor VCC and GND. for wave filtering.
I am using the respberry pi so I will try to use the pi 5v to test and lower the resistor tomorrow... I watch another youtuber and they said to use 3.3v and a 10k resister so I follow their instructions. I will have to order some resistors or but the dht22 that have been mod with the right setup.
Foloseste mai putine cuvinte, incerci sa umpli cu nimic, ajungi sa nu mai fii inteles. Fa-ti un plan, eventual o lista cu lucrurile pe care le vrei sa le expui. Spor!
Awesome video!
thanks . i also showed how to get data from ds18b20 using normal usb ttl adapter, without using any microcontroller. may be that might be of your interest.
hi, if you don't use the resistor what will happen, I have mines setup
with a 10k but the temp is off 10 degrees. do you have any idea why I am
off so much degrees? I am using the DHT22 with 3.3V. also can this be power by only by 3.3v or it can be power by 5v?
Input pins are high impedance and essentially open circuit as far as
loading goes. Without some load at the end of the line all of your
interconnecting wire will act as an antenna and that "hum" will be added
to the dc voltage you want to read giving you very inaccurate readings.
In the industrial setting we don't read many analog sensors as
voltages but as closed loop currents using the 4-20 format where the
monitoring point converts it to a voltage and corrects for the 4mA
representing a 0 reading. 10k resistor is to much, try a 4.7K resistor. DHT22 can be powered from 3.3 to 6v. If you use 3.3v you need to ensure that 3.3 is solid, doesn't drop, because if it goes under ~3.3v the internal thermistor will fail to read properly. I strongly recommend you to hookup a 100nF capacitor between sensor VCC and GND. for wave filtering.
I am using the respberry pi so I will try to use the pi 5v to test and lower the resistor tomorrow... I watch another youtuber and they said to use 3.3v and a 10k resister so I follow their instructions. I will have to order some resistors or but the dht22 that have been mod with the right setup.
Foloseste mai putine cuvinte, incerci sa umpli cu nimic, ajungi sa nu mai fii inteles.
Fa-ti un plan, eventual o lista cu lucrurile pe care le vrei sa le expui.
Spor!