树莓派+TM1637 LED数字显示屏 简单测试
LED屏幕.jpg
#!/usr/bin/env python3
#-*- coding: utf-8 -*-
#导入tm1637模块，并检查模块是否引入成功：
try:
import tm1637 #请保证tm1637.py已复制到当前目录下
import time as tm
except RuntimeError:
print("引入错误")
#BCM pin coding,I2C SDA SCL
CLK=15 #CLK接15号针
DIO=14 #DIO接14号针
#实例化TM1637
led = tm1637.TM1637(clk=CLK, dio=DIO)
#测试，全点亮
led.show('8888', True)
tm.sleep(3)
#全灭4个空格
led.show(' ')
tm.sleep(1)
#显示数字
led.number(1234)
tm.sleep(3)
# 显示字符 Help
led.show('Help')
tm.sleep(3)
# 循环显示长字符串 Hello World
led.scroll('Hello World') # 4 fps
#tm.sleep(3)
# 显示温度
led.temperature(-5) # LO*C
tm.sleep(3)
led.temperature(37) # 5*C
tm.sleep(3)
# 显示时间
led.show('1259', True)
tm.sleep(3)
#30s倒计时
for s in range(30,-1,-1):
led.numbers(0, s)
tm.sleep(1)
#全灭, 4个空格
led.show(' ')
tm.sleep(1)
附： tm1637.py
需要将下面代码保存文件名为tm1637.py并放在同一个文件夹下面
"""
Original source for MicroPython
MicroPython TM1637 quad 7-segment LED display driver
https://github.com/mcauser/micropython-tm1637
Python3 Port
https://github.com/depklyon/raspberrypi-python-tm1637
MIT License
Copyright (c) 2016-2018 Mike Causer
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""
from time import time, sleep, localtime
from wiringpi import wiringPiSetupGpio, pinMode, digitalRead, digitalWrite, GPIO
wiringPiSetupGpio()
TM1637_CMD1 = 0x40 # 0x40 data command
TM1637_CMD2 = 0xc0 # 0xC0 address command
TM1637_CMD3 = 0x80 # 0x80 display control command
TM1637_DSP_ON = 0x08 # 0x08 display on
TM1637_DELAY = 0.00000001 # 10us delay between clk/dio pulses
TM1637_MSB = 0x80 # msb is the decimal point or the colon depending on your display
# 0-9, a-z, blank, dash, star
_SEGMENTS = bytearray(b'\x3F\x06\x5B\x4F\x66\x6D\x7D\x07\x7F\x6F\x77\x7C\x39\x5E\x79\x71\x3D\x76\x06\x1E\x76\x38\x55\x54\x3F\x73\x67\x50\x6D\x78\x3E\x1C\x2A\x76\x6E\x5B\x00\x40\x63')
class TM1637(object):
"""Library for quad 7-segment LED modules based on the TM1637 LED driver."""
def __init__(self, clk, dio, brightness=7):
self.clk = clk
self.dio = dio
if not 0 <= brightness <= 7:
raise ValueError("Brightness out of range")
self._brightness = brightness
pinMode(self.clk, GPIO.OUTPUT)
pinMode(self.dio, GPIO.OUTPUT)
digitalWrite(self.clk, 0)
digitalWrite(self.dio, 0)
def _start(self):
digitalWrite(self.clk, GPIO.HIGH)
digitalWrite(self.dio, GPIO.HIGH)
digitalWrite(self.dio, GPIO.LOW)
digitalWrite(self.clk, GPIO.LOW)
def _stop(self):
digitalWrite(self.clk, GPIO.LOW)
digitalWrite(self.dio, GPIO.LOW)
digitalWrite(self.clk, GPIO.HIGH)
digitalWrite(self.dio, GPIO.HIGH)
def _write_data_cmd(self):
# automatic address increment, normal mode
self._start()
self._write_byte(TM1637_CMD1)
self._stop()
def _write_dsp_ctrl(self):
# display on, set brightness
self._start()
self._write_byte(TM1637_CMD3 | TM1637_DSP_ON | self._brightness)
self._stop()
def _write_byte(self, b):
for i in range(8):
digitalWrite(self.clk, GPIO.LOW)
digitalWrite(self.dio, GPIO.HIGH if b & 1 else GPIO.LOW)
b >>= 1
digitalWrite(self.clk, GPIO.HIGH)
# wait for ACK
digitalWrite(self.clk, GPIO.LOW)
digitalWrite(self.dio, GPIO.HIGH)
digitalWrite(self.clk, GPIO.HIGH)
pinMode(self.dio, GPIO.INPUT)
while (digitalRead(self.dio)):
sleep(TM1637_DELAY)
if (digitalRead(self.dio)):
pinMode(self.dio, GPIO.OUTPUT)
digitalWrite(self.dio, GPIO.LOW)
pinMode(self.dio, GPIO.INPUT)
pinMode(self.dio, GPIO.OUTPUT)
def brightness(self, val=None):
"""Set the display brightness 0-7."""
# brightness 0 = 1/16th pulse width
# brightness 7 = 14/16th pulse width
if val is None:
return self._brightness
if not 0 <= val <= 7:
raise ValueError("Brightness out of range")
self._brightness = val
self._write_data_cmd()
self._write_dsp_ctrl()
def write(self, segments, pos=0):
"""Display up to 6 segments moving right from a given position.
The MSB in the 2nd segment controls the colon between the 2nd
and 3rd segments."""
if not 0 <= pos <= 5:
raise ValueError("Position out of range")
self._write_data_cmd()
self._start()
self._write_byte(TM1637_CMD2 | pos)
for seg in segments:
self._write_byte(seg)
self._stop()
self._write_dsp_ctrl()
def encode_digit(self, digit):
"""Convert a character 0-9, a-f to a segment."""
return _SEGMENTS[digit & 0x0f]
def encode_string(self, string):
"""Convert an up to 4 character length string containing 0-9, a-z,
space, dash, star to an array of segments, matching the length of the
source string."""
segments = bytearray(len(string))
for i in range(len(string)):
segments[i] = self.encode_char(string[i])
return segments
def encode_char(self, char):
"""Convert a character 0-9, a-z, space, dash or star to a segment."""
o = ord(char)
if o == 32:
return _SEGMENTS[36] # space
if o == 42:
return _SEGMENTS[38] # star/degrees
if o == 45:
return _SEGMENTS[37] # dash
if o >= 65 and o <= 90:
return _SEGMENTS[o-55] # uppercase A-Z
if o >= 97 and o <= 122:
return _SEGMENTS[o-87] # lowercase a-z
if o >= 48 and o <= 57:
return _SEGMENTS[o-48] # 0-9
raise ValueError("Character out of range: {:d} '{:s}'".format(o, chr(o)))
def hex(self, val):
"""Display a hex value 0x0000 through 0xffff, right aligned."""
string = '{:04x}'.format(val & 0xffff)
self.write(self.encode_string(string))
def number(self, num):
"""Display a numeric value -999 through 9999, right aligned."""
# limit to range -999 to 9999
num = max(-999, min(num, 9999))
string = '{0: >4d}'.format(num)
self.write(self.encode_string(string))
def numbers(self, num1, num2, colon=True):
"""Display two numeric values -9 through 99, with leading zeros
and separated by a colon."""
num1 = max(-9, min(num1, 99))
num2 = max(-9, min(num2, 99))
segments = self.encode_string('{0:0>2d}{1:0>2d}'.format(num1, num2))
if colon:
segments[1] |= 0x80 # colon on
self.write(segments)
def temperature(self, num):
if num < -9:
self.show('lo') # low
elif num > 99:
self.show('hi') # high
else:
string = '{0: >2d}'.format(num)
self.write(self.encode_string(string))
self.write([_SEGMENTS[38], _SEGMENTS[12]], 2) # degrees C
def show(self, string, colon=False):
segments = self.encode_string(string)
if len(segments) > 1 and colon:
segments[1] |= 128
self.write(segments[:4])
def scroll(self, string, delay=250):
segments = string if isinstance(string, list) else self.encode_string(string)
data = [0] * 8
data[4:0] = list(segments)
for i in range(len(segments) + 5):
self.write(data[0+i:4+i])
sleep(delay / 1000)
class TM1637Decimal(TM1637):
"""Library for quad 7-segment LED modules based on the TM1637 LED driver.
This class is meant to be used with decimal display modules (modules
that have a decimal point after each 7-segment LED).
"""
def encode_string(self, string):
"""Convert a string to LED segments.
Convert an up to 4 character length string containing 0-9, a-z,
space, dash, star and '.' to an array of segments, matching the length of
the source string."""
segments = bytearray(len(string.replace('.','')))
j = 0
for i in range(len(string)):
if string[i] == '.' and j > 0:
segments[j-1] |= TM1637_MSB
continue
segments[j] = self.encode_char(string[i])
j += 1
return segments
如果报错oduleNotFoundError: No module named 'wiringpi'， 可以尝试以下解决办法：
pip3 install wiringpi