Question

#!/usr/bin/env python

# i2c_ADXL345.py  este es el accelerómetro de 3 ejes
# 2015-04-01
# Public Domain

import time
import struct
import sys

import pigpio # http://abyz.co.uk/rpi/pigpio/python.html

if sys.version > '3':
   buffer = memoryview

BUS=0

ADXL345_I2C_ADDR=0x53

#RUNTIME=60.0 This is the original line.
#RUNTIME=0.10 / This was the new line

pi=pigpio.pi() # open local Pi

h = pi.i2c_open(BUS, ADXL345_I2C_ADDR)

if h >= 0: # Connected OK?

   # Initialise ADXL345.
   pi.i2c_write_byte_data(h, 0x2d, 0)  # POWER_CTL reset.
   pi.i2c_write_byte_data(h, 0x2d, 8)  # POWER_CTL measure.
   pi.i2c_write_byte_data(h, 0x31, 0)  # DATA_FORMAT reset.
   pi.i2c_write_byte_data(h, 0x31, 11) # DATA_FORMAT full res +/- 16g.

   read = 0

#   start_time = time.time() ?part of the RUNTIME?

#   while (time.time()-start_time) < RUNTIME: ?part of the RUNTIME?

      # 0x32 = X LSB, 0x33 = X MSB
      # 0x34 = Y LSB, 0x35 = Y MSB
      # 0x36 = Z LSB, 0x37 = Z MSB

      # < = little endian

(s, b) = pi.i2c_read_i2c_block_data(h, 0x32, 6)

if s >= 0:
         (x, y, z) = struct.unpack('<3h', buffer(b))
         print("{} {} {}".format(x, y, z))
         read += 1

pi.i2c_close(h)

pi.stop()

print()

以上代码生成

265 -17 -34

作为输出。我的问题是我如何更改代码，以便只有＆＃34; 256＆＃34;被生产？包含此值的变量的名称是什么？这些似乎是非常基本的问题，但由于我不是程序员，我试图一次采取这一步骤。我正努力适应＆＃34;这段代码让我可以将它替换为Jay Dosher的Sun位置代码，但由于他使用的是另一个IMU Joan，来自Raspberry Pi，请编写上述代码来阅读我们的IMU。

#!/usr/bin/env python

# i2c_ADXL345.py  this is the 3 axis accelerometer
# 2015-04-01
# Public Domain
# Note - Don't forget to run pigpiod first

import time
import struct
import sys

import pigpio # http://abyz.co.uk/rpi/pigpio/python.html

if sys.version > '3':
   buffer = memoryview

BUS=0

ADXL345_I2C_ADDR=0x53

#RUNTIME=60.0 This is the original line.
#RUNTIME=0.10 / This was the new line

pi=pigpio.pi() # open local Pi

h = pi.i2c_open(BUS, ADXL345_I2C_ADDR)

if h >= 0: # Connected OK?

   # Initialise ADXL345.
   pi.i2c_write_byte_data(h, 0x2d, 0)  # POWER_CTL reset.
   pi.i2c_write_byte_data(h, 0x2d, 8)  # POWER_CTL measure.
   pi.i2c_write_byte_data(h, 0x31, 0)  # DATA_FORMAT reset.
   pi.i2c_write_byte_data(h, 0x31, 11) # DATA_FORMAT full res +/- 16g.

   read = 0

#   start_time = time.time() ?part of the RUNTIME?

#   while (time.time()-start_time) < RUNTIME: ?part of the RUNTIME?

      # 0x32 = X LSB, 0x33 = X MSB
      # 0x34 = Y LSB, 0x35 = Y MSB
      # 0x36 = Z LSB, 0x37 = Z MSB

      # < = little endian

(s, b) = pi.i2c_read_i2c_block_data(h, 0x32, 6)

if s >= 0:
         (x, y, z) = struct.unpack('<3h', buffer(b))
#         (x) = struct.unpack('<3h', buffer(b)) # Let's experiment again.
#         print("{} {} {}".format(x, y, z))
         print("{}".format(x))

         read += 1

pi.i2c_close(h)

pi.stop()

print()

这是新代码，现在只生成254.我们剩下的问题是：具有此值的变量的名称是什么？

Answer 1

在这种情况下，变量的名称为x，如(x, y, z) = struct.unpack('<3h', buffer(b))中所定义。

我如何让这个程序只产生输出：265为变量？

1 个答案: