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Dobrica Pavlinušić's random unstructured stuff
PCA9685: Revision 7
{image: PCA9685.jpg}
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller .pre dpavlin@cubieboard:~$ zgrep 9685 /proc/config.gz CONFIG_PWM_PCA9685=m # on armbian this requires kernel recompile root@cubieboard:~# i2cdetect -y 2 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: UU UU -- UU -- -- -- -- UU -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: 70 -- -- -- -- -- -- -- root@cubieboard:~# echo pca9685 0x70 > /sys/bus/i2c/devices/i2c-2/new_device [Tue Jun 25 19:59:58 2019] i2c i2c-2: new_device: Instantiated device pca9685 at 0x70 root@cubieboard:/sys/devices/platform/soc/1c2b000.i2c/i2c-2/2-0070/pwm/pwmchip0# echo 0 > export # Default period_ns = 1/200 Hz root@cubieboard:/sys/devices/platform/soc/1c2b000.i2c/i2c-2/2-0070/pwm/pwmchip0/pwm0# echo 5000000 > period root@cubieboard:/sys/devices/platform/soc/1c2b000.i2c/i2c-2/2-0070/pwm/pwmchip0/pwm0# cat period 5000000 root@cubieboard:/sys/devices/platform/soc/1c2b000.i2c/i2c-2/2-0070/pwm/pwmchip0/pwm0# cat duty_cycle 0 # move servo root@cubieboard:/sys/devices/platform/soc/1c2b000.i2c/i2c-2/2-0070/pwm/pwmchip0/pwm0# echo 2000000 > duty_cycle root@cubieboard:/sys/devices/platform/soc/1c2b000.i2c/i2c-2/2-0070/pwm/pwmchip0/pwm0# echo 1000000 > duty_cycle .pre ^ sg90 servo motor .pre root@cubieboard:/sys/devices/platform/soc/1c2b000.i2c/i2c-2/2-0070/pwm/pwmchip0/pwm0# echo 20000000 > period # 50Hz root@cubieboard:/sys/devices/platform/soc/1c2b000.i2c/i2c-2/2-0070/pwm/pwmchip0/pwm0# echo 1000000 > duty_cycle # min? root@cubieboard:/sys/devices/platform/soc/1c2b000.i2c/i2c-2/2-0070/pwm/pwmchip0/pwm0# echo 3000000 > duty_cycle # max? .pre |