How to make talking Voltmeter at home
Homemade talking voltmeter using Arduino It's easy to make a simple digital voltmeter using an Arduino, Audio amplifier and Speaker It's relatively simple to use an Arduino to measure voltages. The Arduino has several analog input pins that connect to an analog-to-digital converter (ADC) inside the Arduino. The Arduino ADC is a ten-bit converter, meaning that the output value will range from 0 to 1023. We will obtain this value by using the analogRead() function. If you know the reference voltage--in this case we will use 5 V--you can easily calculate the voltage present at the analog input. Requirement 1. Arduino uno/nano. 2. Audio amplifier. 3. Speaker. 4. 100K ohm resistor. 5. battery . Circuit Diagram Pin mapping table for different platforms * Platform Normal Inverted 8kHz timer PWM timer * ------------------------------------------------------- * AVR 3 11 1 2 * ATmega2560 6/PH3 7/PH4 1