Page 113 - Programming the Raspberry Pi Getting Started with Python

The serial range finder module, shown in Figure 11-6, outputs an inverted signal; therefore, a tiny
board with a single transistor and resistor on it must be used to invert the signal back to normal. Full
instructions for assembling this little adaptor board can be found on the book’s website
(www.raspberrypibook.com).

Figure 11-6 The range finder serial adapter and range finder module
The range finder module plugs into the top of the adapter, and the bottom of the adapter fits into the
serial socket, as shown in Figure 11-7.

Figure 11-7 Assembling the range finder and adapter
Step 2: Attach the Screen
The LCD screen comes in two parts: the screen itself and the driver board. These are connected
together with a rather delicate ribbon cable. I attached the two together with a cushioned self-adhesive
pad. Be careful where you attach the screen, and treat the display delicately.
The screen comes with power leads (red and black) as well as two RCA plugs. To neaten things up, I

cut off one of the RCA plugs (the one connected to the middle cables in the white connector plug).
Refer to Figure 11-8. If this seems too drastic, an alternative is to fasten it somewhere with a cable tie
so that it’s out of the way.