by Gokul Krithivasan, Clemson Automotive Engineering Graduate Student
The Video below demonstrates the working of a simple Battery Voltage Level Indicator that uses an array of 10 LEDs to display the level of voltage remaining on the battery. The Red LEDs denote "Low Battery Charge" while Green LEDs represent "Good/Full Charge" and the Yellow LEDs belong to the Mid-Range.
The Circuit Schematic
Components Used:
1. 1 x Breadboard
2. 1 x IC LM3914 - Dot/Bar Display Driver
3. 2 x 5K Potentiometers
4. 1 x 1K Resistor
4. 1 x 220 ohm Resistor
5. 1 x 4.7 K Resistor
6. 1 x 10 uF Electrolytic Capacitor
7. 1 x SPST Switch
8. 1 x NI MyDAQ
9. Connecting Wires
The Battery Voltage Indicator Circuit on Breadboard
At 15 Volts, the Green LED denotes Full Charge
At 9 Volts, the Yellow LED denotes Moderate Charge
