Try This: Improve the Script

Try This – Prove it Works

If you’re skeptical that packet = “HAPPY” followed by getattr(Image, packet) is equivalent to Image.HAPPY, try this:

• Add this routine between sleep(1000) and while True: in the transmitter script radio_send_images.py.
• Flash the modified script with the Send to micro:bit button.

print("Image.HAPPY =", Image.HAPPY)
sleep(500)
packet = "HAPPY"
print( "getattr(Image, packet) =", getattr(Image, packet) )    
sleep(500)

• If the serial monitor isn’t already open, click Show serial.
• Verify that the results resemble what’s shown here.

Image(…) has brightness data for each LED in the display.  In this case it only uses 0 (LED off), and 9 (LED brightest).  Values between 0 and 9 for each LED can be used to control the brightness.
 

Your Turn – Compact your Code

This code takes up unnecessary program space in the micro:bit module’s memory.  

    packet = "HAPPY"
    print("Send:", packet)
    radio.send(packet)
    sleep(2500)
    
    packet = "SAD"
    print("Send:", packet)
    radio.send(packet)
    sleep(2500)

    packet = "ANGRY"
    print("Send:", packet)
    radio.send(packet)
    sleep(2500)

Your program can instead create a list like string_list = [“HAPPY”, “SAD”, “ANGRY”].  Then, inside the while True loop, the for packet in string_list can index through each string in string_list.

• Use that hint to modify the radio_send_images transmitter script.  
• Test and verify your solution.