How to wire for battery level measure?

[msebbe]

I dont understand how to wire if I want to measure battery level at A0 pin.. I have 1MΩ (R1) and 470KΩ (R2) resistor. But how do I connect this?

[AWI]

@msebbe put the two resistors in series between Vcc (Vin) and Gnd and connect the middle ( Vout) to the A0 pin. If you connect the 1 MOhm (R2) to ground, the voltage on the A0 pin is then two third (2/3) times Vcc. This is called a voltage divider.

[msebbe]

@AWI said:

@msebbe put the two resistors in series between Vcc (Vin) and Gnd and connect the middle ( Vout) to the A0 pin. If you connect the 1 MOhm (R2) to ground, the voltage on the A0 pin is then two third (2/3) times Vcc. This is called a voltage divider.

1M to grund? In example from mysensors picture says 1M to vcc.

Also, could I wire so both resistors meet at A0 or how do you do it?

[m26872]

Vin = Vbat
Vout = A0
R1= 1M
R2 = 470k

[Sparkman]

@msebbe said:

Also, could I wire so both resistors meet at A0?

Yes, that is fine.

Cheers
Al

[msebbe]

Ok, thank you guys, will try this tomorrow when I have a whole day free :D

[Cliff Karlsson]

@AWI said:

resistors in series between Vcc (Vin) and Gnd and con

Trying to figure out the same thing. Did I understand correctly that I could solder 1M Resistor from VCC to A0 and 470k Resistor from GND to A0 ?

[AWI]

@Cliff-Karlsson You could do just that. The voltage on the A0 pin will be around 1/3th of Vcc. If you swap the resistors 2/3th of Vcc.