jfedyczak/kyarr

NanoPi NEO Air voice recorder

kyarr

Installation instructions

NanoPi NEO Air

Flash eMMC (from SD-booted system)

# dd if=nanopi-air-core-qte-sd4g-20161213.img of=/dev/mmcblk1 bs=1M
# apt-get install parted
# parted /dev/mmcblk1
(parted) print
(parted) resizepart 2 100%
(parted) quit
# resize2fs /dev/mmcblk1p2

Setup WiFi

# mount /dev/mmcblk1p2 /mnt/
# cd /etc/wpa_supplicant
# cp /etc/wpa_supplicant/wpa_supplicant.conf ./
# cat wpa_supplicant.conf
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
        ssid="ESSID"
        psk="PASSWORD"
}
# umount /mnt/

Tools Installation

After removing SD card and rebooting into eMMC:

# apt-get install alsa-base
# timedatectl set-timezone Europe/Warsaw
# apt-get install dosfstools
# apt-get install avahi-daemontools

SD card management

Creating new partition map

Partition script clear.sfdisk:

label: dos
label-id: 0x6b797272
unit: sectors

start=8192, type=b

Where 0x6b797272 is a magic number of your choice. Apply partition script:

# sfdisk /dev/mmcblk1 < clear.sfdisk

Format partition:

# mkfs.vfat -n KYARR /dev/mmcblk1p1

Recording instructions

arecord -l

This gives:

**** List of CAPTURE Hardware Devices ****
card 1: sndhdmi [sndhdmi], device 0: SUNXI-HDMIAUDIO sndhdmi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: Microphone [Logitech USB Microphone], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0

Then use -D hw:2,0 to record from card 2, device 0:

arecord --max-file-time 180 -D hw:2,0 -t wav -c 1 -r 44100 -f S16_LE --use-strftime /mnt/%Y-%m-%d/rec-%H%M%S-%v.wav

It will create new file every 180 seconds.