Table 4: Comparisons between observation at digital voltmeter module and I2C LCD.
| LED that turns ON | I2C LCD/A (Volt) | Digital voltmeter Module/B (Volt) | Differences/B - A (Volt) |
| 0 | 14.78 | 15.2 | 0.42 |
| 1 | 15.00 | 15.4 | 0.4 |
| 2 | 16.09 | 16.5 | 0.41 |
| 3 | 17.03 | 17.5 | 0.47 |
| 4 | 18.05 | 18.5 | 0.45 |
| 5 | 19.14 | 19.5 | 0.36 |
| 6 | 20.00 | 20.5 | 0.50 |
| 7 | 20.94 | 21.4 | 0.46 |
| 8 | 21.87 | 22.4 | 0.53 |
| 9 | 22.81 | 23.4 | 0.59 |
| 10 | 23.75 | 24.4 | 0.65 |
| 11 | 24.69 | 25.4 | 0.71 |
| 12 | 25.70 | 26.4 | 0.70 |