Difference between revisions of "How to control the backlight brightness with PWM(7-B/7-C)"
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[[File:7-C-背光控制-4.jpg|750px]] | [[File:7-C-背光控制-4.jpg|750px]] | ||
+ | |||
+ | <br><br> | ||
+ | 连接树莓派: | ||
+ | <br><br> | ||
+ | [[File:7-C-背光控制-21.jpg|500px]] | ||
+ | <br><br> | ||
+ | 在树莓派3B/3B+终端执行以下命令即可控制背光亮度: | ||
+ | |||
+ | <pre> | ||
+ | gpio -g pwm 18 1024 | ||
+ | gpio -g mode 18 pwm | ||
+ | gpio pwmc 1000 | ||
+ | gpio -g pwm 18 X | ||
+ | </pre> | ||
+ | |||
+ | (X的数值应当在0~1024之间) | ||
+ | <br><br><br> | ||
+ | 在树莓派4B中,需要先更新 wiringPi GPIO 库(树莓派需要连接互联网): | ||
+ | <pre> | ||
+ | cd /tmp | ||
+ | wget https://project-downloads.drogon.net/wiringpi-latest.deb | ||
+ | sudo dpkg -i -B wiringpi-latest.deb | ||
+ | </pre> | ||
+ | |||
+ | 执行以下命令即可控制背光亮度: | ||
+ | <pre> | ||
+ | gpio -g pwm 18 1024 | ||
+ | gpio -g mode 18 pwm | ||
+ | gpio pwmc 1000 | ||
+ | gpio -g pwm 18 X | ||
+ | </pre> | ||
+ | |||
+ | (X的数值应当在0~1024之间) |
Revision as of 15:35, 13 June 2020
This method is only available for 7-B Rev3.2, 7-C Rev3.3 or above
连接树莓派:
在树莓派3B/3B+终端执行以下命令即可控制背光亮度:
gpio -g pwm 18 1024 gpio -g mode 18 pwm gpio pwmc 1000 gpio -g pwm 18 X
(X的数值应当在0~1024之间)
在树莓派4B中,需要先更新 wiringPi GPIO 库(树莓派需要连接互联网):
cd /tmp wget https://project-downloads.drogon.net/wiringpi-latest.deb sudo dpkg -i -B wiringpi-latest.deb
执行以下命令即可控制背光亮度:
gpio -g pwm 18 1024 gpio -g mode 18 pwm gpio pwmc 1000 gpio -g pwm 18 X
(X的数值应当在0~1024之间)