Usage - Seeed Grove Manual

4. Usage

When measuring the external voltage, connect the external voltage to J1 and then connect the on-board
Grove connector to analog port of Arduino/Seeeduino:

Connect the module to A0 port of

Connect Grove - Base Shield to Arduino/Seeeduino.
In order to test the precision of this module, I tested some voltage inputs and get the following data:

As you can see, when the inputs were in the measuring range, the voltage divider has a high
accuracy(<1%, that i marked an "OK"). But as the inputs were not in the range, the accuracy gets
low(i marked a "NO") Please see
And When voltage divider output voltage is higher than VCC (The Grove Operating Voltage and
reference of analog read), an indicator will light up to show you the error.

Using the serial monitor of Arduino, you can measure the input voltage value. Demo code as
show below:
void setup(){
Serial.begin(9600);
}
Grove - Base Shield with a universal Grove Cable.
Specification about the specific measurement range.
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