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#!/bin/bash

# Send a Twilio SMS when a person logs in over SSH or uses sudo. Michael Fincham <[email protected]> 2017-05-22
#
# For a Debian host:
# - Install the packages for libpam-script and curl 
# - Edit this script to set the configuration variables, and place it in /usr/share/libpam-script/pam_script_acct
# - Add this line to /etc/pam.d/common-account:
#   account optional pam_script.so

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$fn = 50;
corner_radius = 7;

module lens(h) {
	// lens is a cube([192.96, 110.76, 5]) with rounded corners
	hull() {
		cylinder(r=corner_radius, h=h);
		translate([192.96, 110.76, 0]) cylinder(r=corner_radius, h=h);
		translate([192.96, 0, 0]) cylinder(r=corner_radius, h=h);
		translate([0, 110.76, 0]) cylinder(r=corner_radius, h=h);

fincham

1 x Pololu DRV8835 Dual Motor Driver Shield for Arduino = @ $10.00 ea.
1 x Romi Chassis Kit - Pink = @ $40.00 ea.
1 x RedBoard - Programmed with Arduino = @ $31.00 ea.
1 x RedBot Sensor - Mechanical Bumper = @ $7.00 ea.

Depending on how much you want to thrash the motors, you might want a replacement regulator to power the RedBoard (knock off arduino) so you can use fewer batteries and run the whole thing at a lower voltage. Pololu 5V Step-Up/Step-Down Voltage Regulator S7V8F5 will give you 5v to feed in to the RedBoard's Vcc after the regulator.

Whatever sensors appeal to you, here are some suggestions:
1 x Mini Photocell = @ $1.00 ea.
1 x Ultrasonic Range Measurement Module - HC-SR04 = @ $7.00 ea.

fincham

/*
 * Sandbox the execution of `ls' to just a subset of the available Linux syscalls.
 */

#include <seccomp.h>
#include <stdio.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    scmp_filter_ctx ctx = NULL;

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$fn = 50;

module foot() {
	cylinder(r=3,h=1);

	hull() {
		translate([0, 0, 0.99])
			cylinder(r=2.8, h=0.01);

		translate([0, 0, 5])