Step 17: Insert the Photocell

Insert one pin of the photocell at pin 1 of the relay, just above the diode connection.

Insert the other pin of the photocell just above the center pin of the second transistor (the one more towards the front of the SpurtBot).

Pinch the two leads of the photocell slightly, being very careful not to let them touch each other. Then take a piece of 3/16 inch shrink tubing about ¾ inch to 7/8 inch long, and place it over the photocell.

This will prevent stray light from interfering with the operation of the photocell.

Note: If you find the SpurtBot is not sensitive enough to light during testing, even after adjusting the potentiometer, you can trim the length of the shrink tubing so that the photocell is closer to the opening. You want to keep the photocell lower than the top edge of the tubing. Don't cut it now, wait until testing.
<p>really cool!!</p><p>i like your all spurt robots.</p>
Very cool, pretty clever there with the relay! I had my scouts build these. Here's mine running around the kitchen: https://www.youtube.com/watch?v=0VKtpQ8i1AU&amp;feature=youtube_gdata_player
Yay! Nice to see the ShadowRunner worked out well for you.<br>You can also check out my other SpurtBot designs. You can re-use the body of the Shadow Runner and try the line follower (http://www.instructables.com/id/Build-a-SpurtBot-Line-Follower/) or light follower (http://www.instructables.com/id/SpurtBot-Light-Follower-Rocket-Brand-Studios-Tadpo/)<br><br>Have fun!
Huh, well I feel silly now. Don't know how I missed that, but thanks anyway!
Hey ignoblegnome, <br>Do you think you could post a schematic for the bot? It'd be a big help as I'm using a different relay and several other parts. <br>Thanks!
The schematic is posted as a picture in the Intro section. It is the 2nd picture, right at the top if the Instructable.

About This Instructable


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Bio: I'm a robotics hobbyist and general tinkerer, among other things. Check out my blog or the LetsTalkRobots Playlist on YouTube: http://www.youtube.com ...
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