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nuetron last won the day on December 7 2011

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About nuetron

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  1. I actually did that to a co-worker one time and got banned from doing that to him for a long time. He was in the middle of a critical project when he left his workstation unlocked while he was up talking to management, and when he got back I let him go as far as task manager before I stopped him from terminating Excel, with his unsaved docs. I've been thinking about pranks for a long time, and these have been rattling around in my mind: 1. The Frozen Programs Prank With Hidden Taskbar (same as above, but with the apps open) 2. The AZERTY Prank (switch the keyboard layout to the azerty format) 3. The Busy Cursor Prank (change the cursor to the spinning circle) 4. The Upside-Down Screens Prank (Ctrl-Alt-Arrow, or whatever the videocard has for shortcuts to rotate the screen) I have a slightly less tech-savvy co-worker who leaves his workstation unlocked. I'm going to combine all of these and hit him at one time.
  2. I used incandescent christmas light bulbs for my igniters. They will light up (and ignite anything toching it) on an AAA battery.
  3. I'm designing a bluetooth-controlled quadcopter, but use the MSP430 only to control the rotors and get instructions from the HC06 bluetooth module. An android cellphone will provide all the sensors and computing power.
  4. Well, the sensors arrived. I haven't double-checked the online listing, but it looks like the "Wireless" aspect was only that they do not require a wired power supply. The internal circuitry consists of a button cell battery pack, inductor, unprotected reed switch (no glass casing), Piezo, and plastic-blob-covered integrated circuit (dislike those...). The way these work is on a current status basis. The door opens, the alarm sounds, the door closes, the alarm quits. I have purchased a set of the system that CJN mentioned above, so I will see how that goes. Until that comes in and for quite a while afterward, I will be busy with the bluetooth module that came in yesterday (HC06 type). Time to learn Bluetooth and developing android apps (I have been wanting to for some time anyway, just never had the hardware for it). Anybody ported mspgcc to android yet?
  5. Thanks all! I had a long response all typed out and addressed to people, but had a glitch and tapatalk lost it. One of the things I had hinted at was using the sensor modules' built-in speakers for ultrasonic communication, instead of the typical RF communication, that would be so out of band as to be alien to the normal hacking.
  6. Recently, someone broke into our house while nobody was home during the weekend - They didn't disturb or steal anything, just probably getting financial info. I have been brainstorming, gathering ideas that have been lying dormant. Here is what I have come up with so far: System contains 8 - 20 wireless *(1) nodes with sensors. System has one basestation, contains registration info for all nodes, contains bluetooth module for keyless arm/disarm of zones. *(2) Each node will poll its sensor *(3) several times a second, and check in with the base station once an hour to inform that all is well. Any false result of polling the sensor will result in immediate warning sent to base station once per second for the duration of the false result. The base station will then upload to the server in the cloud the event ID (i.e. which door/window of the house), duration, and time of event. The server will then send out a text message (at the beginning of the duration to ensure prompt alert) to the person responsible for said door/window (this is useful if there are multiple people in the same house, and each bedroom's sensors will alert the occupant). *(1): I have purchased several wireless modules which I plan to remove the internal circuitry and replace with MSP430's, possibly keeping the radio. They also have 90db speakers installed, which could be used to transmit data ultrasonically (no pets in the building). *(2): Bluetooth pairing beforehand, not visible to unpaired devices. Requires app on phone to log in and send code for (en/dis)able of zone. Zone may include multiple devices, i.e., the whole house excluding specific rooms. *(3): Whether infrared or magnetic leaves, but I prefer IR. I also want the server to be accessed externally via web interface (HTTPS - login required) so that the events can be reviewed. I currently have a Linux webserver already running one Wordpress site, so it wouldn't be a problem adding another website or sub address. Any suggestions/additions? Are there any projects already incorporating elements described here that I can reference code?
  7. Ah, I missed a line. Here is the corrected version of that command in context with this program: rs ? (P1OUT |= RS) : (P1OUT &= ~RS); Thanks for catching that. I'll fix it so other people don't stumble on it. There had been several programs I was working with at the time, jumping from program to program that used almost the same functions. In one of those programs, I used a char variable as an 8-bit compact set of bool variables. A char and a bool use the same amount of ram (8 bits), but a bool is used for the least significant bit, and the rest are truncated. I had several global bools, but little ram. So I used a char to hold 8 bools, and I toggled the bit I needed, and read that bit when required, then determined whether it was true or false. I could even use that 8 bits as 4 bools and a 4-bit counter. There are all kinds of ways to compress things.
  8. How long is the sale supposed to last? Or has it already ended?
  9. Come to think of it, they would work well for powering the 8x8x8 LED cube I haven't finished...
  10. Seems to me they would be great for generating 5v for an HD44780 LCD (especially one with a backlight), or what ever else needed 5vdc when even a single AA cell was the only source available (same goes for 3.3v). For that matter, since this provides 1.5amps, a USB port connector could be attached to it to create a quick single-use (AA side) cellphone charger. Two potentiometer-adjustable 1763's on a small PCB with a 4-pin 90-degree header (common gnd, common input, out1 and out2) would be great for plugging straight into a breadboard socket.
  11. Now priced! We have almost a full reel (2044). $1.5 apiece + $2.50 shipping (USPS padded envelope + static free packaging from the reel, and will pack as many purchased in an envelope as possible) Message me with how many you want and I'll get back to you with paypal info. Willing to trade some max1763's for boards to install some on...
  12. A friend gave us a few of these very attractive MAX1763EEE-T DC-DC converters/regulators. (We also received some 2.4uH inductors, but I'm not sure if they will work with these.) These are surplus from L3's nightvision manufacturing division. Specs: 0.7vdc to 5.5vdc input 2.5vdc to 5.5vdc output 1.5Amp output MAX1763 datasheet here There are several pros and cons: Pros: Small, compact size Few external components required Designed to run on one to three AA batteries Resistor-controlled output voltage Cons: SMD (a heat gun works quite well for soldering) Components have a very low maximum distance: All of the cons would be overcome if we had some 2x2cm boards to install these on. Anyone with SeeedStudio experience want to turn a proft?
  13. Changed, but now the order isn't correct, and I don't seem to be able to change it...
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