| RF Communications - August 06 2012, 03:30 pm Pacific Daylight Time |
I've been spending a lot of time at work reverse engineering some frequency-hopping communication signals. Unfortunately, I can't go into a lot of the details, but the communications center around TI's CC2500 all-in-one RF transceiver. The chip is a very cheap way to develop 2.4 GHz systems. I've been thinking of developing some kind of remote using the CC2500, perhaps using challenge-response encryption to secure it.
I discovered probably the most useful debugging tool for embedded development: the Saleae Logic. It's a very affordable USB logic analyzer that has been more useful to me than some expensive $15k logic analyzers in the lab. It can capture 10 billion samples at reasonable sample rates. Most importantly, it has built-in decoding for almost every serial interface you'd use, including asynchronous serial, SPI, I2C, CAN, etc. It has saved me countless hours while debugging. Although it lacks complex triggering and sometimes gets angry with high sample rates, it's still a great tool for hobbyists.
I have pretty much finished development on my RFID Door Controller and I'm currently installing it at the radio station (1 door works so far). I should have a writeup finished this week.
Finally, for my Microwave Design class that I took this summer, I had to design a 5.8 GHz frequency-hopping signal generator using a PLL, VCO and microcontroller. My group had the most successful project, so I'll be posting it here soon.0 comments | Write Comment |
| New projects - May 29 2012, 12:32 pm Pacific Daylight Time |
I've added a few more of my recent projects!
This completes all of my past projects that I've wanted to upload, with the exception of the Lab Kiosk. I'm still working on some documentation for that, including a video of the nerf gun that shoots intruders, so I should be uploading that soon.
My current side project is a door controller that I plan to add to my radio station. It can control up to 4 doors with RFID readers and electronic strikes, and it will be very well documented since I intend to leave it at the radio station for many years in the future after I've left. I've finished the first hardware prototype and am preparing to get the PCB's made at Seeed Studio. They make PCB's for incredibly cheap prices. I should be getting a batch with 10 boards, 5x10cm for only $30 shipped! Full two layers with silkscreen and soldermask.2 comments | Write Comment |
| Welcome! - February 06 2012, 05:19 pm Pacific Standard Time |
I have given my website a bit of a reboot.
PageMac is now where I will be documenting all of my personal projects. Although it's pretty much always been this, I did not update anything during my undergrad years, and I plan to fill the site now. Most of my projects are hardware and EE related, as opposed to the software projects I worked on in high school. The only content sticking around from before is D++ (and it's been updated!)
If there are any old school PageMac members, come say hi!1 comment | Write Comment |
| Beep - February 03 2012, 12:25 pm Pacific Standard Time |
Hello. Hello. Transmitter Control.
Thank you. Alarms are clear. For readings, enter the channel number.
1 a plate current equals two point four eight amps.
2 a plate volts equals nine point four two kilovolts.
3 a transmitter power out equals one five point nine three kilowatts.
To raise this channel, press the pound key. For lower, press star.
Please enter command.
Thank you. Goodbye.
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