Velleman VMP502, User Manual

Page: 26 / 51

VMP502
V. 02
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25/10/2019 26 ©Velleman nv
Experiment
C Programming
1. Change directory:
cd/home/pi/IDUINO_SuperKit_C_code_for_RaspberryPi/09_Timer555/
2. Compile:
gcc timer555.c
–
o timer555
–
lwiringPi
3. Run:
sudo ./timer555
Python Programming
1. Change directory:
cd/home/pi/IDUINO_SuperKit_Python_code_for_RaspberryPi/
2. Run:
sudo python 09_timer555.py
You should see data on the display, which are square waves generated by the 555 timer. The programme
counts pulses by interrupt as we have learned previously.
The above circuits outputs square waves with constant frequency and duty cycle. You can simple change this
circuit to adjust the frequency and duty cycle.