5volt analogoutput from sensor MQ7 to analoginput A0 (pin14) teensy 3.2

[Stathis_ARIS3]

Hi,
How can i read from the analog output 5volt sensor to get 0-3.3volt for read from pin14-> A0 analoginput on teeensy 3.2 ?
I use the MQ7 sensor it works in 5volt Vcc and gives analogoutput 0-5volt!

i try to use the Vout=5volt(R2/(R1+R2)) ->5*(330Ω/160Ω+330Ω)=3.36volt

this arithmetic type does not work,gives wrong values !



thank you!

 

[WMXZ]

Try with less current (e.g. 33k/(16k+33k))

 

[Stathis_ARIS3]

Thank you WMXZ !!
Yes it gives normal value !!! it works !!


Thanks again!!!