Application description

AN3280

6/13

Doc ID 17983 Rev 1

1.3

Application principle

This application uses the ADC1, TIM1 and GPIO peripherals.

The input voltage analog signal from variable resistor RV1 is sampled and filtered on

channel 9 of the ADC1 system (PE6), which is internally triggered by TIM1.

The average value of this signal is represented on the LED bar (LD2-5).

Table 1.

Voltage and LED correspondence

Voltage (V)

LEDs switched on

0.0 - 0.7

None

0.7 - 2.0

LD2

2 - 3

LD2 + LD3

3 - 4

LD2 + LD3 + LD4

4 - 5

LD2 + LD3 + LD4 + LD5