Light To Frequency 2
All Mikroelektronika’s development systems feature a large number of peripheral
modules expanding microcontroller’s range of application and making the
process of program testing easier. In addition to these modules, it is also
possible to use numerous additional modules linked to the development system
through the I/O port connectors. Some of these additional modules can operate
as stand-alone devices without being connected to the microcontroller.
™
Manual
Additional board
MikroElektronika
Light To Frequency 2
The Light to Frequency 2 additional board is used to convert light into frequency.
Key features:
- Communicates directly with a microcontroller;
- Absolute output frequency tolerance of ±5%;
- Nonlinearity error typically 0.2% at 100 kHz;
- Power supply 3.3 or 5V DC.
Figure 1:
Light to Frequency 2 additional board
How to connect the board?
The Light to Frequency 2 board is connected to a development system via a 2x5 connector CN1 on the additional board
and one of 2x5 port connectors on the development system.
How to use the board?
The operation of this additional board is based on converting light into square wave voltage pulses or pulse train. The
frequency of voltage pulses obtained in this way is directly proportional to light intensity received by the on-board sensor.
The higher light intensity on the sensor, the higher pulse frequency.
The sensitivity of the on-board sensor depends on the logic levels of pins S1 and S0, table 1. The pulse frequency may
be reduced by dividing with numbers contained in table 2.
S1
L
L
H
H
Table 1
S0
L
H
L
H
SENSITIVITY
Power down
1X
10X
100X
S3
L
L
H
H
Table 2
S2
L
H
L
H
fo SCALING (divided by)
1
2
10
100
The meaning of deisgnations used in the tables:
L
H
- Logic 0
- Logic 1
MikroElektronika
Figure 2:
Additional board connection schematic
Figure 3:
Dimensions of the board
Figure 4:
Light to Frequency 2 connected to a development system
MikroElektronika
MikroElektronika
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