DocID028405 Rev 1

11/28

UM1955

Photodiode/UV sensor

28

5

Photodiode/UV sensor

This configuration can be used to monitor the ambient light and, for example, trigger an

action when a threshold level is reached.

5.1

Schematic diagram

Figure 6 depicts the circuit schematic of photodiode sensor configuration.

Figure 6. Photodiode configuration circuit schematic

5.2

How to set up the expansion board

This configuration does not require any setup. Only the output voltage is reported. This

voltage is available on pin A4 of the Arduino UNO R3 connector and PC1 of the ST morpho

connectors (not mounted in the expansion board).

5.3

Measurement example

Here, three examples have been selected.

•

amplifier which is saturating)

•

•

amplifier which is saturating)

Depending on the needs of the application, it can be interesting to have current with better

sensitivity to darkness. In this case, it is recommended to increase the value of the R26