我刚做了一个树莓皮秤。下面的代码运行良好。皮重完成后,它会准确称量物体,同时在rasp pi屏幕上显示时间/日期和重量值。但是,它对csv文件没有任何作用。列上没有名称,没有数据。奇怪的是,代码运行时没有显示错误。谁能看看出了什么问题吗? 谢谢 波琳娜
#! /usr/bin/python2
import csv
import datetime
import time
#tare and use the scale
EMULATE_HX711=False
referenceUnit = 1
if not EMULATE_HX711:
import RPi.GPIO as GPIO
from hx711 import HX711
else:
from emulated_hx711 import HX711
def cleanAndExit():
print("Cleaning...")
if not EMULATE_HX711:
GPIO.cleanup()
print("Bye!")
sys.exit()
hx = HX711(5, 6)
hx.set_reading_format("MSB", "MSB")
#CALCULATE THE REFFERENCE UNIT
hx.set_reference_unit(1903.3090)
hx.reset()
hx.tare()
print("Tare done! Add weight now...")
#measure weight and write it to csv
while True:
try:
# gets the weight.
val = hx.get_weight(5)
# problems here, doesn't write to csv
with open('/home/pi/Desktop/sensor2.csv', 'w') as csv_file:
writer = csv.writer(csv_file)
# Write a header row with the name of each column.
writer.writerow(['Time', 'weight'])
# loop generating new sensor readings every and writing them
# to the CSV file.
while True:
# Make some sensor data.
reading_time = datetime.datetime.now()
weight = hx.get_weight(5)
# Print out the data and write to the CSV file.
print('Time: {0} weight: {1}'.format(reading_time, weight))
writer.writerow([reading_time, weight])
hx.power_down()
hx.power_up()
time.sleep(0.05)
except (KeyboardInterrupt, SystemExit):
cleanAndExit()
检查文件夹和文件的权限,因为这可能是问题所在。我在我的RPI3b+上运行了你的代码(没有下面的比例部分),它运行得非常好。确保文件和文件夹都是可写的。我的传感器文件以前不存在,已按预期创建和填充。这就是我测试的:
sensor.csv的内容是:
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