Figure 1 shows the schematic for the game board. Build the circuit shown below, paying close attention to the polarity of your LEDs. Before continuing, check that your circuit meets the following criteria:
Now, it's time to build and test two phototransistor circuits to give your ActivityBot phototransistor "eyes." Leave the piezo speaker circuit in place.
As you build the circuit shown below:
Now, it's time to build and test two phototransistor circuits to give your ActivityBot phototransistor "eyes." Leave the piezo speaker circuit in place.
Build the circuit shown below.
Not only does this activity provide another useful application for your WAM Kit, but it is also a great lesson on optimizing your breadboard real estate. There are a lot of components to fit onto the board, so we need to make the most of the space available. Figure 1 shows the schematic for this mini timer.
If you have difficulties assembling the timer, check this Parallax forum thread for more help.
The schematic for the RF tilt controller and the schematic for the radio controlled Boe-Bot are below.
Phototransistors are a common type of analog light sensor – the kind that might help a porch light automatically turn on at night. Think of the phototransistor as a light-controlled current valve. When light strikes the base of the device (B), more current will conduct into its collector lead (C) and flow out of its emitter lead (E).
Phototransistors are a common type of analog light sensor – the kind that might help a porch light automatically turn on at night. Think of the phototransistor as a light-controlled current valve. When light strikes the base of the device (B), more current will conduct into its collector lead (C) and flow out of its emitter lead (E).
In this activity, you will build and test the infrared object sensor system to make sure they detect objects in front of the ActivityBot. Just like the whisker circuits, there is one on the right and one on the left so the ActivityBot can determine which way to turn in relation to the obstacle.
In this case, each side needs two electronic components: an LED that rapidly flashes infrared light, and an infrared receiver to detect a reflection of that infrared light bouncing off of objects nearby.
In this activity, you will build and test the infrared object sensors to make sure they detect objects in front of the ActivityBot.
(2) IR LEDs
(2) IR receivers
(2) 1 k-ohm resistors (brown-black-red)
(2) 220-ohm resistors (red-red-brown)
In this activity, you will build and test the infrared object sensor system to make sure they detect objects in front of the ActivityBot. Just like the whisker circuits, there is one on the right and one on the left so the ActivityBot can determine which way to turn in relation to the obstacle.
In this case, each side needs two electronic components: an LED that rapidly flashes infrared light, and an infrared receiver to detect a reflection of that infrared light bouncing off of objects nearby.
