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AGlass0fMilk

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Everything posted by AGlass0fMilk

  1. Hi there! I recently won a littleBits Workshop Set from an instructables contest for my 430-based DJ controller. I feel a bit guilty for selling a prize but I don't need these littleBits and would like to get some new tools. So I'm offering the set here for $850 + shipping (figure 10lbs, tracked/insured/signature confirmation). It retails for about $1,200 new so you can save a couple hundred. Here's a description: New littleBits Workshop Set w/ Workshop Guide Save on this great kit today! Perfect for educators, hackerspaces, kids, teens, and even adults interested in learning about electron
  2. I haven't checked out the new Launchpads but after developing on the Rev 1.4 MSP430G-series for so long I think I'm ready to move up. I checked out the F5529 Launchpad and it seems pretty cool! Might have to pick one up soon, I want to make more USB-based instruments/music-related electronics. They're super cheap at $12 too! I'm still amazed at how much a little IC can do. Integrated ADCs, Timers, USB, UART/SPI/I2C, it's really impressive. Thanks for the suggestion, I'm going to look at other dev boards from TI now. After getting my friend's feet wet with this instructable, he doesn't
  3. I said I'd post it when I was done, so here it is! It's a Laser-cut USB DJ Controller made with two MSP430G2553s and an MCP3008 ADC. Check out the Instructable I made for more information about the build. If you like it, please vote for it in the contests I entered! Thanks guys! Instructables Link Representing the 43Oh!
  4. Wow guys... I've been working with this code for so long and never even realized it was the OR operator in the if statement... I feel so embarrassed. I've been programming for a few years now, even on MSP430. Hahaha, I guess it really takes a few fresh eyes to pick out the little mistakes like that. I will recompile it with the && operator when I have the change and see how much it improves. I may try the running average idea. I could also try upping the sample count and balance the latency with the stableness of the readings. Also, the purpose of the check for absolute min
  5. Hey there guys. First post in a long time. I find myself developing once again on an MSP430G2553 chip on a Rev 1.4 Launchpad and I am trying to take samples from the on-chip ADCs using Energia. It's not secret that the on-chip ADCs are quite unstable (very accurate perhaps?), I don't get anywhere near the kind of jitter I see when using the MCP3008 (10-bit, 8-channel ADC converter IC). Regardless, I am very frustrated with the section of my code that deals with smoothing the signal from analog controls. I am sampling 4 ADC values and averaging it, no problem. What really frustr
  6. Thanks, I'll see what I can do to suppress jitter in my signal with a low pass filter. I'll get back with the results. Thank you all!
  7. As it stands, I do not think I am going to have the computer send any information so scenario 1 will be what I'm doing. I just have a general circuitry question. The launchpad in question will be in quite a noisy (electrically and audio-wise) environment (it will be a MIDI controller). How can I limit the amount of jitter in my ADC lines? A small value ceramic cap to ground? Edit: The mcu software already checks new values to see if they are within a certain number of "clicks" of the old value. I'm just wondering if there's a way through hardware to limit it in cases where there m
  8. I think the alternative method would be the best option there. Data transfer from the PC to the Launchpad will be sparse (if I do it at all) so I could just include a sender identifier bit in the commands sent to the Launchpad from the G2553. I'll try it out and check back, thanks for your help.
  9. Just to give you an idea of what I'm trying to do, I plan on programming the independent (off-Launchpad) G2553 to backpack onto a keypad (I plan on it being modular so I can use it in other projects if I want to) in order to increase the number of available pins on the main microcontroller. I will probably make it possible to get keypress data from the independent G2553 through both UART and I2C so it will be a more universal keypad solution, but for this situation I would like to use the UART so I can use the I2C pins as ADCs instead. I'll just give you a little diagram (as you did) for t
  10. Hello there. For a project I am making, the Launchpad board must be able to communicate with my computer. Mostly the dataflow will be from the microcontroller to my computer, but I may introduce communication from the computer to the Launchpad sometime in the future. I am wondering a couple things at the moment (and may use this thread to ask further questions if I have any): 1. If I do not plan to have the computer send data to the microcontroller, can I have another G2553 send commands to the Launchpad using this line? (TXD to computer, RXD to another G2553) 2. If I plan to do th
  11. I have been experimenting with MSP430G2553 for a while now, I have the hardware UART sending the measured frequencies to my computer through the USB and I have successfully measured PWM'd signals accurately. I have been reading the user guides for both the family and the specific chip I have, and I came across the fact that you can set P1 and P2 interrupts to go off on rising edges, much like the Capture/Compare function of Timer_A. But since I need more than 5 capture ports (which is how many my device supports externally) I was thinking: What is the difference between having the Capture/
  12. Thank you very much! I guess I missed that setting But the capture/ISR works, I'll post back if I have anymore questions.
  13. I have been reading the datasheet and family user guide and have found out more about the MSP430G2553's two Timer_As. For my project, I want interrupts enabled so I have written some extra code. I have also looked at demos that are designed do to things similar to what I am trying to do, but my code isn't working. There's a lot to initialize that I don't fully understand yet so bear with me. I am testing my code with a 555 timer that is set to emit around 500Hz, but nothing happens when I apply the output to P2.0 (the pin I am testing with) Here's the code: #include void main(void) {
  14. It appears that the MSP430G2553 actually has two 16-bit Timers (Timer0_A and Timer1_A)! Which I believe means I have 6 Capture/Compare channels, which is a good number for my project. The only problem is that the TACCRO1 and TACCRO2 are grouped into the TAIV interrupt vector but it probably won't be that big of a problem. EDIT: It also appears that there is no external input pin for TA0CCTL2 so I may only be able to have 5 inputs
  15. I am trying to make a frequency counter in order to experiment with the MSP430G2553. But as a beginner to microcontrollers (although not programming), it is proving harder than I thought (an operating system certainly hides a lot!) This project is supposed to be able to measure quite low frequencies (at most ~1.5kH) and I need to sample multiple frequencies at a time. From my understanding of the research I've currently done, one possible (quick) formula to measure a frequency is to start a counter at the rising edge of a frequency, and then stop it at the next rising edge of a frequen
  16. I got off-board input and output working, and as far as I can see, the chips as well as the board are not fried due to my stroke of stupidity! :roll: I also ordered some samples from TI for other microcontrollers and I look forward to further experimentation with the Launchpad. Thanks for your support guys.
  17. I am trying to control a higher-voltage circuit with the low-power MSP430G2231 and Launchpad that is rated for ~3.3V. The circuit I want to control is 9V. I can use a transistor for such low-voltages, but how would I wire the circuit so that both circuits have separate power supplies? I have a 3V power supply that I will use to power the uC and the other circuit has a 9V power supply as well. I'm a newbie to uC's (but not programming) and a novice in electronics so thank you for your help. Nevermind, I just connected the negative wires, is this the proper way though?
  18. I should've mentioned before, when first experimenting with the board, I reinserted the microcontroller backwards and powered it up, could it have damaged the board? :? The microcontroller can still be programmed and operation seems normal, I just can't get off-board peripherals to work. Is there anyway I could check if the board is damaged and I should just order another? Applying the pull-up resistor part to my code, when touching a wire to the pin hole, the Red LED flickers on then off quickly. It's a start but I probably need to solder a female header onto the board to get a good con
  19. I'm new to Microcontrollers and the Launchpad and I'm trying to implement simple programs that receive and send input and output from OUTSIDE the Launchpad, but I'm having trouble doing so. Currently, I'm testing receiving input by making the onboard red LED turn on when the microcontroller receives input on a specified pin (in this case, P1.5). But with both the microntrollers that come with the Launchpad (MSP430G2231 and MSP430G2211), whenever I wire an input to P1.5 the red LED turns on, even touching a wire to the pin without power to it turns on the LED. The code I have written works when
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