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| 1 | # Accelerometer-controlled "burning coals" display | |
| 2 | # For the BBC Micro:bit, with the Mu Editor | |
| 3 | # By Ido Gendel, 2017 | |
| 4 | # Share and enjoy! | |
| 5 | # P.S. Thanks to Timo Denk for the Python advice :-) | |
| 6 | ||
| 7 | from microbit import * | |
| 8 | from random import randrange, seed | |
| 9 | ||
| 10 | tickMS = 10 | |
| 11 | ||
| 12 | energy = 0 | |
| 13 | minEnergy = 2 | |
| 14 | maxEnergy = 9 | |
| 15 | maxTwinklerTicksToStart = 36 | |
| 16 | energyLossPerTick = 1 | |
| 17 | ||
| 18 | ||
| 19 | class twinkler: | |
| 20 | def __init__(self): | |
| 21 | self.ticksToStart = 0 | |
| 22 | self.light = 0 | |
| 23 | self.lightTarget = 0 | |
| 24 | ||
| 25 | def twinklerReset(self, energyLevel): | |
| 26 | self.ticksToStart = max(0, randrange(maxTwinklerTicksToStart) - | |
| 27 | energyLevel * 2) | |
| 28 | self.light = 0 | |
| 29 | self.lightTarget = max(1, int(energyLevel)) | |
| 30 | ||
| 31 | ||
| 32 | twinklers = [twinkler() for _ in range(25)] | |
| 33 | ||
| 34 | ||
| 35 | def getDisplayImage(): | |
| 36 | """ Convert the twinkler object data to an image string """ | |
| 37 | twinkleStr = "" | |
| 38 | for i, t in enumerate(twinklers): | |
| 39 | twinkleStr = twinkleStr + str(t.light) | |
| 40 | if (i+1) % 5 == 0: | |
| 41 | twinkleStr = twinkleStr + ":" | |
| 42 | return Image(twinkleStr) | |
| 43 | ||
| 44 | ||
| 45 | def cycleLights(): | |
| 46 | """ Update the twinkler objects """ | |
| 47 | for t in twinklers: | |
| 48 | if t.ticksToStart > 0: | |
| 49 | t.ticksToStart -= 1 | |
| 50 | continue | |
| 51 | ||
| 52 | if t.light < t.lightTarget: | |
| 53 | t.light += 1 | |
| 54 | if t.light == t.lightTarget: | |
| 55 | t.lightTarget = 0 | |
| 56 | else: | |
| 57 | t.light -= 1 | |
| 58 | if t.light < 0: | |
| 59 | t.twinklerReset(energy) | |
| 60 | ||
| 61 | ||
| 62 | # Initialization code | |
| 63 | display.clear() | |
| 64 | seed() | |
| 65 | for t in twinklers: | |
| 66 | t.twinklerReset(0) | |
| 67 | lastAcc = accelerometer.get_values() | |
| 68 | ||
| 69 | # Main loop | |
| 70 | while True: | |
| 71 | sleep(tickMS) | |
| 72 | ||
| 73 | energy = max(minEnergy, energy - energyLossPerTick) | |
| 74 | currAcc = accelerometer.get_values() | |
| 75 | # Magic number 750 is based on trial and error | |
| 76 | accDiff = max(abs(currAcc[0] - lastAcc[0]), | |
| 77 | abs(currAcc[1] - lastAcc[1]), | |
| 78 | abs(currAcc[2] - lastAcc[2])) / 750 | |
| 79 | energy = min(maxEnergy, energy + accDiff) | |
| 80 | lastAcc = currAcc | |
| 81 | ||
| 82 | display.show(getDisplayImage()) | |
| 83 | cycleLights() |
