twin voltage sensers

Could someone point me at an explanation of or tell me how to connect two voltage sensors to a aduino uno and the code to use them please - assuming its possible
Have searched but without success

I'm guessing they are 5v reference. Whats your project?

And what voltage range are you expecting to measure?

For some unknown reason I'm not getting forum reply notifications even though that option was/is ticked ?

I've already got the project almost up and running, just got to finish of the inputs and outputs and tidy up the wiring.
The project is, a 6v solar panel supplies power to a 6v pond pump, the Ardino (the project) measures the voltage from the solar panel and if that voltage falls below 6v changes the supply from the solar panel to a 6v supply from a mains 6v transformer.
That works and already users one 25V Voltage sensor module (monitors the solar panel) to switch the supply and display the voltage on a lcd.

Both outputs (solar & transformer) will go through a Power Supply Step-Down Module to trim the 6v outputs to the same value.
The second 25V Voltage sensor module will sense and display the output from the Power Supply Step-Down Module.
Hopefully that all makes sense

So how can I connect and use a second 25V Voltage sensor module, can it be done ?

Where do these 25V sensor modules come from? Can you post a link to a data sheet?

Why not use a resistor voltage divider and measure the voltage with the Arduino?


This is the type of sensor - one in use and one ready to use.
Why i used that and not the Arduino itself is as being new to this type of thing the example i found used a external sensor and not the Arduino

Right... That is exactly what I suggested you use. That is 2 resistors in a voltage divider. The overall value is 5, so one resistor is 4 times larger than the other, say a 10K and 40K ish.

Those can be had for a little less than 2.99....

I take it you read the result of the sensor via an analogue pin?

You just need the resistors. You don't need it packaged up on a pretty little board.

thanks for both replys
could you point me at or give examples please - just assume 'he knows nothing'

i can generally experiment my way to what i want if I've got something to look at

Have you got any resistors? If so, list their values.

got a few packs of resisters
5.6,100,150,470,1k,4.7k,10k,33k,47k,100k,470k,1m ohms

solved i think

volt=(analogRead(0)/4.092)/10;//thats how i'm reading the voltage from the extant volt sensor
volt2=(analogRead(1)/4.092)/10;//and this should be how i'd read from an extra volt sensor

now why didn't i realise what that first line was doing - because i never looked properly

thanks for taking an interest people

If you use a 47K and a 10K you get a ratio that is slightly off but you can correct in code. So 25V to 47K to A0 to 10K to Gnd. Unless you want a bigger ratio or you want to use 100K and 470K.