<\/div>\n<\/div>\n
In particular, the\u00a0i2cdetect<\/code>\u00a0program will probe all the addresses on a bus, and report whether any devices are present. Enter the following command in the command line. The\u00a0-y<\/code>\u00a0flag will disable interactive mode so that you do not have to wait for confirmation. The\u00a01<\/code>\u00a0indicates that we are scanning for I^{2<\/sup>C devices on I^{2<\/sup>C bus 1 (e.g. i2c-1).<\/p>\n}}
i2cdetect -y 1\n<\/code><\/pre>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\nYou will get an output from your Raspberry Pi similar to the output below.<\/p>\n
pi@raspberrypi:~\/$ i2cdetect -y 1\n     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f\n00:          -- -- -- -- -- -- -- -- -- -- -- -- --\n10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --\n20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --\n30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --\n40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --\n50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --\n60: 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --\n70: -- -- -- -- -- -- -- --\n<\/code><\/pre>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\nThis map indicates that there is a peripheral at address\u00a00x60<\/strong>. We can try to read and write its registers using the\u00a0i2cget<\/code>,\u00a0i2cset<\/code>\u00a0and\u00a0i2cdump<\/code>\u00a0commands.<\/p>\n
A few comments:<\/strong><\/p>\n
The instructions provided by\u00a0anvoice<\/strong>\u00a0in\u00a0this question<\/a>\u00a0were essential, but the actual dependencies are a few years out of date. So I suggest you try step #1 and read the dpkg output to tailor dependencies to your version of raspi-config.<\/p>\n
It appears that raspi-config may not be necessary, but you might only need to add the\u00a0dtparam=i2c_arm=on<\/code>\u00a0flag to \/boot\/config.txt (see\u00a0the official docs<\/a>). I haven’t tried (yet). If you want to try,\u00a0sudo nano \/boot\/config.txt<\/code>, add the flag on a new line, CTRL-X, confirm with Y, then start at step #6.<\/p>\n
 <\/p>\n
2.2\u5b89\u88c5adafruit\n\u65b9\u6cd51\nsudo pip3 install adafruit-pca9685<\/p>\n
\u65b9\u6cd52\nsudo apt-get install git build-essential python-dev\ncd ~\ngit clone https:\/\/github.com\/adafruit\/Adafruit_Python_PCA9685.git<\/a>\ncd Adafruit_Python_PCA9685\nsudo python3 setup.py install<\/p>\n
\u65b9\u6cd52\u5b89\u88c5\u7684\u5728Adafruit_Python_PCA9685-master\/examples\u4e0b\u6709\u4e2a\u4f8b\u7a0bsimpletest.py\n\u65b9\u6cd5\u4e00\u6211\u6ca1\u627e\u5230\u8fd9\u4e2a\u6587\u4ef6\uff0c\u627e\u4e0d\u5230\u7684\u53ef\u4ee5\u53bbgithub\u91cc\u627e\u3002\u70b9\u8fd9\u91cc\u00a0https:\/\/github.com\/adafruit\/Adafruit_Python_PCA9685\/tree\/master\/examples<\/a><\/p>\n\n
\u590d\u5236\u6216\u4e0b\u8f7d\uff0c\u7136\u540e\u8fd0\u884c<\/p>\n
python3 simpletest.py\n\u53ef\u4ee5\u770b\u89c1\u8235\u673a\u8f6c\u52a8<\/p>\n
\u6211\u6539\u8fc7\u7684\u4ee3\u7801<\/p>\n
from future<\/strong> import division # python2\u4f7f\u7528<\/h1>\nimport time\nimport Adafruit_PCA9685 # \u8c03\u7528PCA9685\u6a21\u5757<\/p>\n
pwm = Adafruit_PCA9685.PCA9685()<\/p>\n
\u8bbe\u7f6e\u6700\u5927\u6700\u5c0f\u8109\u51b2\u957f\u5ea6<\/h1>\nservo_min = 90 # 4096\u7684\u6700\u5c0f\u8109\u51b2\u957f\u5ea6\nservo_max = 640 # 4096\u7684\u6700\u5927\u8109\u51b2\u957f\u5ea6\nservo_mid = 365 # 4096\u7684\u4e2d\u95f4\u8109\u51b2\u957f\u5ea6<\/p>\n
\u8bbe\u7f6e\u9891\u7387\u4e3a60<\/h1>\npwm.set_pwm_freq(60)\nprint(‘Moving servo on, press Ctrl-C to quit…’)\nwhile True:\npwm.set_pwm(0, 0, servo_min)\ntime.sleep(1)\npwm.set_pwm(0, 0, servo_max)\ntime.sleep(1)\n\u8fd0\u884c\u5c31\u53ef\u4ee5\u770b\u89c1\u63a5\u5728\u901a\u90530\u4e0a\u7684\u8235\u673a\u53cd\u590d\u8fd0\u52a8<\/p>","protected":false},"excerpt":{"rendered":"
\u6811\u8393\u6d3e\u63a7\u523616\u8defPWM\u8f93\u51fa\u7684PCA9685\u6a21\u5757 1.PCA9685 1.1\u7b80\u4ecb \u91c7\u7528I2C\u901a\u4fe1\uff0c\u5185\u7f6e\u4e86PWM\u9a71\u52a8\u5668\u548c\u4e00\u4e2a\u65f6\u949f\uff0c\u4e0d\u9700\u8981\u4e0d\u65ad\u53d1\u9001\u4fe1\u53f7\u5360\u7528\u5355\u7247\u673a\u8d44\u6e90 \u652f\u630116\u8defPWM\u8f93\u51fa\uff0c\u6bcf\u8def12\u4f4d\u5206\u8fa8\u7387(...<\/p>","protected":false},"author":1,"featured_media":2152,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,274,39],"tags":[509,510],"class_list":["post-2135","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux","category-python","category-scm","tag-pca9685","tag-510"],"_links":{"self":[{"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/posts\/2135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/comments?post=2135"}],"version-history":[{"count":6,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/posts\/2135\/revisions"}],"predecessor-version":[{"id":2188,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/posts\/2135\/revisions\/2188"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/media\/2152"}],"wp:attachment":[{"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/media?parent=2135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/categories?post=2135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nick.txtcc.com\/index.php\/wp-json\/wp\/v2\/tags?post=2135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}