from machine import SPI, Pin from hx711_spi import * # from hx711 import * pin_OUT = Pin(12, Pin.IN, pull=Pin.PULL_DOWN) pin_SCK = Pin(13, Pin.OUT) spi_SCK = Pin(14) # spi = SPI(0, mode=SPI.MASTER, baudrate=1000000, polarity=0, # phase=0, pins=(None, pin_SCK, pin_OUT)) spi = SPI(1, baudrate=1000000, polarity=0, phase=0, sck=spi_SCK, mosi=pin_SCK, miso=pin_OUT) hx = HX711(pin_SCK, pin_OUT, spi) # hx = HX711(pin_SCK, pin_OUT) from utime import ticks_ms, ticks_diff, sleep, sleep_ms from machine import Pin hx.OFFSET = 0 # -150000 hx.set_gain(128) sleep_ms(50) data = [0 for _ in range(100)] def get_median(hx, num=100): for _ in range(num): data[_] = hx.read() data.sort() return data[num // 2] def run(loops = 100): start = ticks_ms() hx.set_gain(128) sleep_ms(50) resulta = get_median(hx, loops) hx.set_gain(32) sleep_ms(50) resultb = get_median(hx, loops) print(resulta, resultb) def run100(loops=100, delay = 1): for _ in range (loops): run(100) if delay: sleep(delay) def minmax(loops=10000, raw=True): hx.set_gain(128) middle = hx.read_average(min(loops, 1000)) hx.filtered = middle middle = abs(middle) - hx.OFFSET cnt0003 = 0 cnt001 = 0 cnt003 = 0 cnt010 = 0 cnt030 = 0 cnt100 = 0 cntx = 0 print ("Mittelwert", middle) for _ in range(loops): if raw is True: val = abs(hx.read()) - hx.OFFSET else: val = abs(hx.read_lowpass()) - hx.OFFSET if middle * (1 - 0.00003) < val < middle * (1 + 0.00003): cnt0003 += 1 elif middle * (1 - 0.0001) < val < middle * (1 + 0.0001): cnt001 += 1 elif middle * (1 - 0.0003) < val < middle * (1 + 0.0003): cnt003 += 1 elif middle * (1 - 0.001) < val < middle * (1 + 0.001): cnt010 += 1 elif middle * (1 - 0.003) < val < middle * (1 + 0.003): cnt030 += 1 elif middle * (1 - 0.01) < val < middle * (1 + 0.01): cnt100 += 1 else: cntx += 1 print("Really out of band at %d: %d %x" % (_, int(val), int(val))) print("+/- 0.003%% %f\n+/- 0.01%% %f\n+/- 0.03%% %f\n+/- .1%% %f\n+/- .3%% %f\n+/- 1%% %f\nBeyond: %f" % (cnt0003/loops, cnt001/loops, cnt003/loops, cnt010/loops, cnt030/loops, cnt100/loops, cntx/loops)) run() # minmax(10000)