A standard LED, connected to a pair of microcontroller bidirectional I/O pins with a high-impedance capability, can act as a photodiode to detect light intensity
| Authors | Radovan Stojanovic, Dejan Karadaglic |
| Main Document | Article «Single LED Takes On Both Light-Emitting And Detecting Duties» |
| Description | Figure 1 |
| File Format / Size | PDF / 15 Kb |
| Document Language | English |
Other Materials from the Main Document
- Article «Single LED Takes On Both Light-Emitting And Detecting Duties»
- Figure 1. A standard LED, connected to a pair of microcontroller bidirectional I/O pins with a high-impedance capability, can act as a photodiode to detect light intensity
- Figure 2. The LED photodiode circuit operates in three steps, with control provided through the microcontroller and a C-based software routine
- Figure 3. With greater light intensity on the LED, the decay time (TD), during which the voltage on P1 discharges, is shorter (a). The voltage on P2 goes high if TD exceeds TDCR (b). These are experimental results using a 5-mm, high
