VOLTAGE DROP FROM 3.3 V TO 2.0 V FOR ANALOGUE READINGS?

Development Boards Artemis
1

As the title suggests, I want to use the Artemis for a business that includes taking simple readings (temperature readings using thermistor tests). With my current MCU, it’s simple, as I can just use high efficiency from an advanced spindle, but that’s not really an option here.

I am concerned about the power usage so I should have the option to turn the test circuit on and off. Again, pretty straightforward using the advanced pin.

I’m decently new to this area, and several general thoughts, but I might really want to hear from more experienced people on the prescribed procedures and assumptions.

The perspectives I have considered are:

  1. Using a voltage divider, but the test circuit itself is a voltage divider circuit, so I don’t know what the impact of their bonding will be, or what the force contemplations look like here

  2. Using a BJT semiconductor as a change from an external power source and then using LDO or Zener diode (s) to further reduce the voltage depending on the situation.

Very appreciated

2

Hi @rakeshpatel,

Out of curiosity, which Artemis board are you looking to use?

In my experience, analog readings with the Artemis have never been straightforward. A voltage divider is one of the most common methods of scaling down the voltage, but if you’re using the MicroMod Artemis you can forget about it. You end up with a loaded voltage divider due to the op-amp circuitry, which I’ve yet to get to work.

See:

https://github.com/sparkfun/MicroMod_Ar … r/issues/3

https://github.com/sparkfun/MicroMod_Ar … r/issues/4

Paul Clark uses a 2 MOhm/1MOhm voltage divider with the OpenLog Artemis to measure the battery voltage, but the Artemis has a real problem with high impedance and requires an additional correction factor.

See:

https://github.com/sparkfun/OpenLog_Art … -637387632

Others may be able to provide more insight!

Cheers,

Adam