Doppler activity
| Doppler video |
|
| The Doppler baggie is a very small ziploc bag, with string, a small colored breadboard and more | 
|
| Tie the string around the battery holder as shown (the knot is on the left). | 
|
| Remove the protective paper from the back of the breadboard and stick it on the back of the battery holder. Wrap a rubber band a few times also. | 
|
| In the Elegoo kit, find the beeper. It is in a tiny ziploc bag with black components. It is the one with 2 legs, and likely a white sticker on top. Remove the sticker and you'll see a small hole. | 
|
| Stick the beeper into the breadboard, here the legs are in row 1 and 4, and put the wires in the same rows, as shown, The red one goes on the row where the + sign is, the black one in the row where the othe leg is. Should beep! | 
|
| If the beeper moves away from you, you can hear the tone lowering, and
when it moves toward you, you can hear a slightly higher pitch.
You can tape the string to the top of a doorway and swing the beeper, or you can have someone else swing it around, while you listen at a safe distance. If you don't have a helper, stand near a wall outside and swing it around, the sound bouncing off the wall will go up and down in pitch. | 
|
APOD: HDF with sound (The sound file takes a while to load) | |