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January 3, 2017 23:47
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Basics for a wifi enabled speedometer for your bike 🚲. Designed for the ESP8266.
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| import array | |
| import machine | |
| import micropython | |
| import socket | |
| import time | |
| html = """<!DOCTYPE html><html><head><meta http-equiv="refresh" content="5"></head><body><h1>Speed</h1>%s</body></html>""" | |
| micropython.alloc_emergency_exception_buf(100) | |
| index = 0 | |
| ticks = array.array('i', [0] * 10) | |
| p = machine.Pin(12, machine.Pin.IN, machine.Pin.PULL_UP) | |
| def cb(p): | |
| global ticks | |
| global index | |
| if p.value(): | |
| ticks[index] = time.ticks_us() | |
| index = (index + 1) % 10 | |
| irq = p.irq(trigger=machine.Pin.IRQ_RISING, handler=cb) | |
| addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1] | |
| s = socket.socket() | |
| s.bind(addr) | |
| s.listen(1) | |
| print('listening on', addr) | |
| while True: | |
| cl, addr = s.accept() | |
| irq.trigger(False) | |
| vals = list(ticks) | |
| i = index - 1 | |
| then, now = vals[i-1], vals[i] | |
| cl_file = cl.makefile('rwb', 0) | |
| while True: | |
| line = cl_file.readline() | |
| if not line or line == b'\r\n': | |
| break | |
| deltaT = (now - then) / 1000000 | |
| txt = "deltaT: %ss freq: %sHz" % (deltaT, 1/deltaT) | |
| cl.send(html % txt) | |
| cl.close() | |
| irq.trigger(True) |
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