Step 7: Front End Work
Time for some work on the business end of Buggy. First is the IR emitter (clear) and detector (dark). Note the orientation of the long legs (picture 1). Bend them 90 degrees near the base and insert them into the board (picture 2).
Now for another sub-optimal trick. Insert the CdS cell as shown. One of the legs shares a hole with the detector (picture 3). If the don’t both fit, drill it out a bit. Try to leave some pad on the backside, but it is not critical. The leads just need to be solder together.
Resistor R3 (150 ohm) also shares a hole with the emitter (see picture 4).
Double check you’ve got the emitted and detector in the right places (I’ve switched them more than once), and solder away. See if you can do a better job than I am in picture 5!