Jump to content
43oh

AaronInSpace

Members
  • Content Count

    43
  • Joined

  • Last visited

  • Days Won

    1

Everything posted by AaronInSpace

  1. Thanks for the find! Pretty good baud rate but still a bit slow: "Baud Rate : Max 921,600bps" I'm now looking at ones that have SPI. Anyone got an idea of how fast a SPI can run? I see the G2553 spec sheet says frequency is system frequency...So if i clock my 2553 to 16 MHz, what bps is that? It's not quite so easy for me to figure out as UARTs... I'm specifically looking at the Wifi Xbee but I can't figure out the models offered...very confusing: http://www.digi.com/products/wireless-w ... i#overview Also looking at the TiWi-R2 offered by LS Research (http://www.lsr.com/products
  2. Has anyone ever controlled a hobby rc car's Electronic Speed Controller before? It seems like its simple PWM same as the car's servo but mine doesn't behave. Sometimes it runs sometimes it doesn't. It may be that I am using a programmable high-end ESC that doesn't like something about my signal. I'm using the Fusion Novak ESC by the way.
  3. Why not use WiFi for the car? WiFi can stream video easily. Problem will be finding one with a serial interface fast enough.
  4. Okay so perhaps that idea is out. I appreciate all the feedback! If anyone comes up with some idea or product we haven't thought of, let me know!
  5. I don't have an answer to your question, but when first learning I2C a month or so ago I had a lot of trouble with the idea that the address is actually 7 bits. So you may be causing the left shifting by misunderstanding that somehow. After the address (7 bits) the 8th bit should be a read or write (1 bit) making 8 bits followed by a slave ACK. Maybe you are a guru of I2C for all I know but worth a shot to mention.
  6. I have worked a bit with the NXP PCA8565 (http://www.nxp.com/documents/data_sheet/PCA8565.pdf) and it works nicely. Has everything I would want from one, but I have never used the timer or alarm side of it. Just the timekeeping portion. Works over I2C.
  7. Thanks all. I will look into analog video but I am still thinking of doing it digitally. You don't learn much buying a kit and plugging it into your uC. For me this is all about learning (oh ya and playing!). The one at work is to test a radio system anyways and so changing the way it transmits is not a possibility. I can only change the data I am sending. So what format could you use that wouldn't be screwed if you lost a packet the way that a JPEG is?
  8. Hey all, Working up a new project where I want to drive my RC car using an onboard camera module transmitting over some radio frequency to me. It is also similar to something I want to do at work in that I want to transmit video or images with limited bandwidth. Also it will eventually lead to doing a FPV RC airplane (check these out on youtube if you don't know what they are...theyre awesome) which will require longer distances and higher framerates and quality. My main question is this: is there a format of image which can easily be sent over radio. The limitations are that if you use J
  9. Well I tested it on the 5V and it worked fine. I later found a small line somewhere saying that the data and power line must match voltages so that was the problem. I managed to drive my Hobby Off-road RC cars front wheels with the launchpad and am working on the electronic speed controller for the motor. It operates on a PWM signal too but I can't find the info on its specs (I assume 20ms but doesn't work as expected; intermittent) but that's another story. Anyways I am driving servos and good to go on that now. Thanks all!
  10. Wow! Thanks! I managed to test it on my oscilloscope at work today and it was a good square wave 1.5ms per 20ms cycle just as I wanted. Gonna try powering the servo off the 5v on the launchpad instead of 4 AA pack when I get spare time.
  11. Hey Rob. I've read through your code before and must have missed that your 2nd example isn't based on a pot or shift register. Thanks for pointing that out. Bad news is it still doesn't work for me. Same results on pins 1.4-1.7 as I have with my code. I am driving the servo off of a 4 AA battery pack wired straight into the servo and then driving the data line from my launchpad.
  12. Okay thanks I'll start shopping! I saw a cool USB oscilloscope for $175 but was hoping there was a sub-$50 kit out there somewhere. I tried using TI's Grace to get the PWM working and got the same results. I'm starting to lean towards the issue being using 3.3V to drive the data line. Does anyone out there have any experience driving the Futaba S3003. It's pretty common so I'm sure some of you use it. If I need 5V, how can I rig that up? I'm a programmer...not EE
  13. Hey all. I've searched and read through a number of posts about running servos on the launchpad and used some of the code I've found in some of the posts. I'm using the MSP430G2231 on the launchpad with a Futaba S3003. The S3003 wants a 20ms period (50 Hz) with a centering pulse of about 1.5ms. I don't have any pots on me so I was trying to hardcode a centering function. #include void main(void) { // Stop watchdog WDTCTL = WDTPW + WDTHOLD; P1DIR |= BIT0; // Set clock to 1 MHz DCOCTL= 0; BCSCTL1= CALBC1_1MHZ; DCOCTL= CALDCO_1MHZ; // SMCLK = 1 MHz / 8 = 125 KHz (SLAU144E
  14. Different pin patterns for the same chip, huh? More to learn I guess! Okay thanks to you guys! Here's a pic of the first project my friend and I came up with. It's a LED Word Wand writing out "GO NERDS". Made from scratch with no code libraries Also made a motion-activated light show. Next up, robots! Thanks for getting me going.
  15. I made my first circuit last night, and promptly made a "Glow box". That's what I'm calling it at least. I made a breadboard with 3 LED's flashing in sequence and put a paper box around them to diffract the light. Anyways, are you sure that you can use a G2553 on the Launchpad? TI website says it has 24 pins but the board only has 20 slots. It's also not in the table of compatible MCU's in the Launchpad manual. But I probably am missing something, no?
  16. Okay, thanks for both of your suggestions. I got my launchpad yesterday and am going to start playing with it after work today.
  17. Hey all, I am a software engineering student working with an MSP430-based satellite kit at my job. I'm about one month in, having had no electrical engineering or embedded programming experience (except for a bit of experience with a SumoBot kit from Parallax) and am now thoroughly hooked on embedded programming. I'm now deciding how to begin my playtime with embedded systems off the job. Arduino is obviously all the rage right now but I already know and use the MSP430 at work. My interest is in robotics, UAVs, and systems that DO THINGS or MOVE. Games are meh to me. So the question
×
×
  • Create New...