The previous articles in this series [1] brought to you by Elektor.POST showed how to program a PICAXE chip and how to build interfacing circuits to provide both digital and analog inputs and outputs to a PICAXE project. Now we can also allow the PICAXE to switch and control various other electronic circuits, and we know how to select adequate electronic components for our own circuit designs. Additionally, in Part 3 we explored various uses for pulsewidth modulation (PWM), including servo control and sound (by the way, did you recognize the tune?). This article concludes the series, and as promised we will be adding an OLED display and a PS/2 keyboard to a PICAXE. Finally, we will connect the PICAXE to a PC via a serial connection.
 
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