Raspberry Pi on Aamnah - Frontend Web Developer

Installing Raspbian on SD Card (macOS)

Tue, 19 Dec 2017 00:00:00 +0500

1IMAGE=""
2SDCARD="disk3" # identify SD partition card with `diskutil list`
3
4# unmount card
5diskutil unmountDisk ${SDCARD}
6
7# write to card
8sudo dd bs=1m if=${IMAGE} of=/dev/r${SDCARD}

Short:

mount card, diskutil list and identify your card partition, something along the lines of disk2s1. make note.
unmount card, sudo diskutil unmount disk2s1
change naming convention, disk2s1 to rdisk2. Getting the name right is important, so is adding the R at the start.
sudo dd bs=1m if=~/FILE/LOCATION of=/dev/rdisk2
wait till done. It’ll take a while. (takes around 3-6 mins usually)
eject. sudo diskutil eject /dev/rdisk2

Note:

Troubleshooting Audio

Sat, 16 Dec 2017 00:00:00 +0500

Situation: Audio is not working over HDMI

Possibility 1: The TV/Monitor is not being detected in CEA mode

DMT is only well defined in DVI and DVI can not do audio. Audio only works in CEA modes..

1# run to detect if tv/monitor mode 
2tvservice -s
3
4# tvservice -m CEA
5# tvservice -m DMT

Uncomment the following in /boot/config.txt to force an HDMI mode. It can make audio work in DMT (computer monitor) modes.

Install/Upgrade Node.js on Raspberry Pi (Raspbian Jessie)

Wed, 24 Aug 2016 17:07:46 +0500

tl;dr

Run this one command in Terminal:

1curl raw.githubusercontent.com/aamnah/bash-scripts/master/install_nodejs.sh | bash

This will automatically run a script i wrote that takes care of removing existing Node.js stuff, downloading and installing the latest version, and cleaning up afterwards. It also confirms the Node.js version once the installation is done.

The Node.js version that comes pre-installed with Raspbian Jessie is old. If you check the version using node -v, it’ll give you v0.10.29. The latest ARM-version of Node.js as of this writing is v4.2.1. Let’s remove the old and install the latest version available on our Raspberry Pi.

Raspberry Pi on a battery

Wed, 26 Aug 2015 00:00:00 +0500

https://www.youtube.com/watch?v=5Lw2bFTro58 8x GP2700 rechargeable AA batteries. It’s powering a Raspberry Pi model A+. In this test it lasted approximately 44 hrs 45 minutes.

https://www.youtube.com/watch?v=6Wj7bu3MkI8 14hr30min

Setting up cam on Raspberry Pi

Tue, 25 Aug 2015 00:00:00 +0500

You have two options:

- [motion](http://www.lavrsen.dk/foswiki/bin/view/Motion/WebHome)
- [kerberos](https://kerberos.io/)

Motion install is pretty much all command line based.

Kerberos is more user friendly, easier to install and has a modern interface

Install motion

sudo apt-get install motion -y

Config

sudo nano /etc/motion/motion.conf

The following settings should do. Frame settings (width, height, framerate) and ports (webcam_port, control_port) are optional. The most important are the two on/off settings for daemon and webcam_localhost

System Monitor for Raspberry Pi

Wed, 21 May 2014 16:30:36 +0500

RPi-Monitor is a nifty utility that monitors and displays system information about your Raspberry Pi in a nice-looking graphical interface in the browser.
It can show you how much CPU Load you have, what is the temperature of your Raspberry Pi (good to know in cases where you have overclocked the raspberry pi), Used, Free and Total Memroy (RAM), Used, Free and Total Space you have on both partitions of your SD Card, Used, Free and Total SWAP space (Virtual RAM), how long the Raspberry Pi has been running (Uptime), and general information about your Versions (Kernel, Firmware, Processor etc.) as well as any packages that might need updating.
You can see these as stats as well as Graphs.

Custom Raspberry Pi MOTD (Message Of The Day)

Wed, 21 May 2014 16:25:33 +0500

MOTD = Message Of The Day, is the message that shows when you login to the raspberry pi.

See the Bash scripts repo for up to date scripts

1# Disable existing scripts
2sudo chmod -x /etc/update-motd.d/10-uname
3
4# Remove GNU free software text
5echo "" | sudo tee /etc/motd > /dev/null

1# Create new MOTD script and make it executable
2sudo touch /etc/update-motd.d/20-sysinfo
3sudo chmod +x /etc/update-motd.d/20-sysinfo

You can use any of the scripts below. You can either save them in /etc/profile.d/ or in /etc/update-motd.d/. If placing in /etc/profile.d/, the file should have a .sh extension. The contents of the script can also be placed in ~/.bashrc. Recommended place is /etc/update-motd.d/.