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Found 3 results

  1. So I have my MSP430 launchpad with g2553 and g2452 lying around for year now and finally have a reason to use it. I'm a total noob (I mean I programmed some assembler and C in college and know some basic stuff about MCUs but never actually put it to use), but my for my first project I've picked a tough one. That way I'll be challenged and won't get bored. So I've just bought a motherboard that only has 2 fan connectors on it, but I need at least 4 of those, so I decided to make a fan controller. I could just use some 7805s but what's the fun in that? The idea is to use the inferior msp430g2452 controller from the launchpad to generate 4 pwm channels to control 4 fans by changing the duty cycle with potentiometers. From what I've found on the internet, you can only have as many PWM channels as Capture/Compare Registers on a timer, but the first one will always be used for frequency and have 50% duty cycle. 2452 has only one timer with 3 CCRs, so I could only use 2 PWM channels. With g2553 in a 20 pin package that number is 3 and for SMD package you could have 4 PWM channels. But from what I understand from page 6 in tidu761 design guide, you could have as many software PWM channels as you have GPIO pins available. They can all be the same frequency after all, I only need to change the duty cycle. So far as I keep researching design guides and datasheets I have a few questions: 1) What frequency should I use for PWM? I'm guessing it should at least be outside the audible range, so 25 to 30khz should be fine, right? 2) What pins should I use? I would need at least 4 pins for potentiometers, say P1.0 through P1.3 and 4 pins for PWM, P2.0 to P2.3 would be fine? Or should I use some specific pins? Thanks for reading this!
  2. I'm interested in some applications combining a microcontroller and wifi for home automation. My plan is to use an MSP430 with a cc3000 wifi module. I have started some high level functional block diagrams and am interested in any opinions on correctness and suggestions on specific 430 MCUs for the applications. Thanks in advance for any suggestions! Alarm Panel Window Blinds Ceiling Fan Dog Door Garage Door Door Lock Pool Pump Water Heater
  3. I have several of these case fans installed on my PC. Each fan uses four standard 5mm LEDs like the one pictured here. I'd like to replace each LED with an RGB LED controlled by a ws2801 ic. I plan to design a small PCB which would include the ws2801 controller along with a 5mm RGB LED. I would probably just control the whole thing with a Launchpad and use the USB to UART connect for communication with a visual basic or python app on the PC side. The board I'm planning would almost identical the Sparkfun ws2801 breakout, the only differences being the dimensions and LED type. This will be the first PCB I've ever designed so I'm hoping the 43oh community will be able to help me with some advice and hopefully double checking my work. The PC side app would allow for the user to select any color or animation. Another mode I'd like to implement would be a visual temperature monitor that would fade the LEDs from blue to red based on ambient or CPU temp. Phase One: Design PCB: Would you guys recommend I use Eagle PCB for this? Any tutorials you would recommend? I'll be doing this over the next few weeks or so depending on my class work load. Order PCB: I'm going to need 8 to 12 identical boards (depending on price breaks) for two to three fans. Whats the recommended budget PCB house around here, Itead/Dorkbot? Phase Two: Write embedded application: I'm thinking a MSP430g2553 should be fine, It's overkill really. Write PC side application: A GUI that runs in the background and hangs out on the task bar would be awesome for this. This will be another learning curve for me. That's all for now, let me know what you guys think. -Matt