Download Assembly Language Programming for the TRS-80 Color Computer by Laurence A. Tepolt PDF

By Laurence A. Tepolt

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Add them all to the cat sprite. The game uses broadcasts to pass control to the various parts of the program, including on the same sprite. The ‘ask a question’ section picks a random question number from the list of countries and makes a list of possible answers. It includes the correct answer, and two wrong answers which must be different from the correct answer. The code then shuffles this list to put the answers in a random order, before using a broadcast to make the answer sprites appear and show their answers.

You also need to make a variable called player guessed to remember which answer the player chooses, and a list called possible answers. Make all these variables and the list ‘For all sprites’. >STEP-05 Make the main game code The main game code uses three scripts (Listings 1-3). Add them all to the cat sprite. The game uses broadcasts to pass control to the various parts of the program, including on the same sprite. The ‘ask a question’ section picks a random question number from the list of countries and makes a list of possible answers.

In the if field, we place an = Operator block; in its left field, we add gpio21 sensor value, with 1 in the right field. Underneath, we insert broadcast gpio17off. This way, when the button isn’t pressed, the LED will be off. Under else, we insert broadcast gpio17on, to light the LED when the button is pressed. Run the code (as in Listing 4), press that button, and watch your LED! In the next chapter, we’ll add more LEDs to the circuit to make a pedestrian crossing. 04 39 ESSENTIALS ESSENTIALS [ CHAPTER EIGHT ] LED TRAFFIC LIGHTS Following on from the previous chapter, we’ll use three LEDs and a push button to make a pedestrian crossing 40 [ Chapter Eight One ] ] [ LEARN TO CODE WITH SCRATCH ] When the button is pressed, the circuit is broken and Scratch senses a zero value from GPIO pin 21 A piezo buzzer is wired up to the ground rail and GPIO pin 16, for our pedestrian crossing beeps Each LED is connected to a different GPIO pin, so it can be triggered during the traffic light sequence You’ll Need > Solderless breadboard n the latest version of Raspbian Jessie, Scratch features a built-in GPIO server to make it easier to control electronic components or add-on boards.

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