Hi,

I´m checking your bom.csv and i have a dude with value for resistors: R4,R9,R10,R11,R12. What value is?

You have two bom versions, both are ok?

Good work. Thanks.
Regards.

Hello Miceuz

I am looking at your wonderful project analog project because I would like to avoid the AtTiny which is on the chirp sensor I already own.

Looking through the BOM list i am confused about resistor values for R2, R4, R9 and R10. Maybe you could shed some light on this?

Also i figure that "OUT" is an analog voltage between 0 and VCC(?) somehow proportional to soil moisture content, right?

Also what is the lower limiting factor for operation voltage, if its the LM324 with its 3V minimum then maybe if I swap it for i.e. a LMV324M (min voltage 2.7V) then i might be able to get readings supplying only 2.75V?

I know its alot of questions, I hop you will find time to reply :)

What is the principal technology behind this device? I assume it's capacitance, FDR. What frequency do you use? What is the required input voltage? Output?