<p>我正在尝试使用adc转换器(ads1115)</p>
<p>但是当我尝试运行示例脚本时;simpletest.py</p>
<p>我得到:</p>
<p>正在读取ADS1x15值,请按Ctrl-C退出</p>
<h2>|0 | 1 | 2 | 3|</h2>
<p>回溯(最近一次呼叫最后一次):
文件“simpletest.py”,第43行,在
值[i]=adc.read\u adc(i,增益=增益)
文件“build/bdist.linux-armv7l/egg/Adafruit_ADS1x15/ADS1x15.py”,第192行,在read_adc中
文件“build/bdist.linux-armv7l/egg/Adafruit_ADS1x15/ADS1x15.py”,第133行,已读
文件“build/bdist.linux-armv7l/egg/Adafruit\GPIO/I2C.py”,第136行,在readList中
文件“build/bdist.linux-armv7l/egg/Adafruit_PureIO/smbus.py”,第216行,在read_i2c_block_数据中
TypeError:需要一个字符串</p>
<p>当我运行diagnostic命令:i2cdetect时,我得到</p>
<pre><code>i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- 48 -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
</code></pre>
<p>显示错误消息的python脚本(simpletest.py)的完整代码:</p>
<pre><code># Simple demo of reading each analog input from the ADS1x15 and printing it to
# the screen.
# Author: Tony DiCola
# License: Public Domain
import time
# Import the ADS1x15 module.
import Adafruit_ADS1x15
# Create an ADS1115 ADC (16-bit) instance.
adc = Adafruit_ADS1x15.ADS1115()
# Or create an ADS1015 ADC (12-bit) instance.
#adc = Adafruit_ADS1x15.ADS1015()
# Note you can change the I2C address from its default (0x48), and/or the I2C
# bus by passing in these optional parameters:
#adc = Adafruit_ADS1x15.ADS1015(address=0x49, busnum=1)
# Choose a gain of 1 for reading voltages from 0 to 4.09V.
# Or pick a different gain to change the range of voltages that are read:
# - 2/3 = +/-6.144V
# - 1 = +/-4.096V
# - 2 = +/-2.048V
# - 4 = +/-1.024V
# - 8 = +/-0.512V
# - 16 = +/-0.256V
# See table 3 in the ADS1015/ADS1115 datasheet for more info on gain.
GAIN = 1
print('Reading ADS1x15 values, press Ctrl-C to quit...')
# Print nice channel column headers.
print('| {0:>6} | {1:>6} | {2:>6} | {3:>6} |'.format(*range(4)))
print('-' * 37)
# Main loop.
while True:
# Read all the ADC channel values in a list.
values = [0]*4
for i in range(4):
# Read the specified ADC channel using the previously set gain value.
values[i] = adc.read_adc(i, gain=GAIN)
# Note you can also pass in an optional data_rate parameter that controls
# the ADC conversion time (in samples/second). Each chip has a different
# set of allowed data rate values, see datasheet Table 9 config register
# DR bit values.
#values[i] = adc.read_adc(i, gain=GAIN, data_rate=128)
# Each value will be a 12 or 16 bit signed integer value depending on the
# ADC (ADS1015 = 12-bit, ADS1115 = 16-bit).
# Print the ADC values.
print('| {0:>6`enter code here`} | {1:>6} | {2:>6} | {3:>6} |'.format(*values))
# Pause for half a second.
time.sleep(0.5)
</code></pre>
<p>请告知</p>
<p>凯文</p>