This testing module can be used to measure current and voltage. The principle of voltage measurement is based on the design of a voltage divider. The red input terminal can reduce the voltage by 5 times. The analog input voltages for Arduino reach up to 5V, so the input voltage of the module should not exceed 25V. When using 3.3V systems, the maximum should not exceed 16.5V.

The Arduino AVR processors feature 10-bit AD, so this module provides a simulation resolution of 0.00489V. Thus, the minimum voltage that can be detected is 0.02445V.

• Voltage measurement range: DC3 - 25V (Arduino operating at 5V) or DC3 – 16.5V (Arduino operating at 3.3V)
• Current measurement range: DC 0 - 3A