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  1. scaevola's post in Orange PI Zero - GPIO does not work? was marked as the answer   
    Armbianmonitor: https://paste.debian.net/1190400/ Hi there.
    I use Orange Pi zero as home print server. It works for few months for now and I am very pleased with that. Although, my printer falls into deep sleep after printing (it's Brother HL-1110EW) and cannot be woken up by the server. I have to start printer manually to print next printouts. Thus I wanted to install tea4cups to drive a relay turning the printer on and off when needed. 
    I installed the WiringOP-zero (from here: https://github.com/xpertsavenue/WiringOP-Zero) but then strange things become to happen. I connected temporarily a LED diode to indicate the changes of the GPIO. (GPIO-7 and GND). The LED is on all the time, no matter what command I send.
    Even if "gpio readall" shows "0" state on GPIO-7 the led still is on.
    I tried to push the values through "echo":
    But also without success. That means gpio readall still shows changes in the table but there are no physical changes on the pin (the voltage still is on).
    Then I thought that maybe there is no kernel module loaded, but I can see that w1-gpio is loaded:
    lsmod Module Size Used by aes_arm_bs 20480 2 crypto_simd 16384 1 aes_arm_bs ccm 20480 6 xradio_wlan 110592 1 mac80211 532480 1 xradio_wlan sun4i_gpadc_iio 16384 0 cfg80211 491520 2 mac80211,xradio_wlan industrialio 53248 1 sun4i_gpadc_iio zram 24576 2 sun8i_thermal 16384 0 sunxi_cedrus 32768 0 rfkill 20480 3 cfg80211 libarc4 16384 1 mac80211 v4l2_mem2mem 20480 1 sunxi_cedrus videobuf2_dma_contig 20480 1 sunxi_cedrus videobuf2_memops 20480 1 videobuf2_dma_contig videobuf2_v4l2 20480 2 sunxi_cedrus,v4l2_mem2mem videobuf2_common 40960 3 sunxi_cedrus,v4l2_mem2mem,videobuf2_v4l2 w1_gpio 16384 0 wire 32768 1 w1_gpio cn 16384 1 wire uio_pdrv_genirq 20480 0 uio 16384 1 uio_pdrv_genirq cpufreq_dt 20480 0 usb_f_acm 20480 1 u_serial 24576 3 usb_f_acm g_serial 16384 0 libcomposite 45056 2 g_serial,usb_f_acm ip_tables 24576 0 x_tables 24576 1 ip_tables autofs4 36864 2 pwrseq_simple 16384 1 sunxi 16384 0 phy_generic 20480 2 sunxi Then I started to read forums, including this one. Still no clue what is happening, I did not find any similar case.
    I run out of ideas -maybe anyone would have some?
    Oh, I forgot one thing that may be interesting - driving onboard red led actually works. (gpio 30)
    I changed the driving pin for pin9 and it works fine. Pin 7 is damaged or anything? Dunno.
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