CodingPirates/microbit-micropython-cookbook
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Alan Wang
2020-02-20 10:15:45 +08:00
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@@ -148,10 +148,12 @@ while True:
## LED Bar Graph ## LED Bar Graph
A 25-level LED progress bar.
```python ```python
from microbit import display, sleep from microbit import display, sleep
def plotBarGraph(value, maxValue, brightness = 9): def plotBarGraph(value, maxValue, brightness=9):
bar = value / maxValue bar = value / maxValue
valueArray = ((0.96, 0.88, 0.84, 0.92, 1.00), valueArray = ((0.96, 0.88, 0.84, 0.92, 1.00),
(0.76, 0.68, 0.64, 0.72, 0.80), (0.76, 0.68, 0.64, 0.72, 0.80),
@@ -160,19 +162,17 @@ def plotBarGraph(value, maxValue, brightness = 9):
(0.16, 0.08, 0.04, 0.12, 0.20)) (0.16, 0.08, 0.04, 0.12, 0.20))
for y in range(5): for y in range(5):
for x in range(5): for x in range(5):
if bar >= valueArray[y][x]: display.set_pixel(x, y,
display.set_pixel(x, y, brightness) brightness if bar >= valueArray[y][x] else 0)
else:
display.set_pixel(x, y, 0)
while True: while True:
lightLevel = display.read_light_level() lightLevel = display.read_light_level()
plotBarGraph(lightLevel, 255, 9) # or plotBarGraph(lightLevel, 255) plotBarGraph(lightLevel, 255) # or plotBarGraph(lightLevel, 255, 9)
sleep(50) sleep(50)
``` ```
Since read_light_level() uses LEDs themselves as light sensors (see [this video](https://www.youtube.com/watch?v=TKhCr-dQMBY)), a short delay is added, but the LED screen would flicker a bit. Since read_light_level() uses LEDs themselves as light sensors (see [this video](https://www.youtube.com/watch?v=TKhCr-dQMBY)), in this example a short delay is added, but the LED screen would still flicker a bit.
## Servo Control ## Servo Control