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emdarcher last won the day on June 18 2014

emdarcher had the most liked content!

About emdarcher

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    San Francisco, CA
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    Tinkering, Inventing, Electronics, Robotics, FIRST, Linux, C, Engineering, Bushcraft, and many other things.
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  1. @@greeeg The 555 was mounted on the PCB in a circuit with the relative humidity sensor to give a frequency output from the change in capacitance. There may be a way to make a clever circuit to use the MSP430's Analog comparator, or the ADC for capacitance measurement, but I decided to just use the circuit on the board. If it was a resistive sensor, rather than capacitive, I would definitely use the ADC. As for the project, I haven't has as much time to work on it with school and stuff going on, and also many other side projects that I am messing around with, mostly using STM32 and AVR mic
  2. Here is my current project and entry for the Hackaday Prize: http://hackaday.io/project/2375-Garden_automation_and_sensor_network The main purpose originally was to have temperature monitoring of a small outdoor greenhouse, but then I decided to expand it from there. For more info look into the project page via the link above. Description originally from my hackaday projects page: This is a project to create a small network of sensors in the garden, and possibly some automation. The sensor data will be logged on an embedded Linux server (probably a Raspberry Pi or BeagleBone)
  3. @@spirilis I would love to have the 1284p tqfn ic if it is still available. just getting into smd and seeking a more powerful avr to try out, so this seems like a good chip for that.
  4. @@zlalanne The l293d part needs a minimum of 4.5v on the datasheet , so i am supplying it with power straight from the 4-5 AA NiMH batteries to get 4.8 - 6V. The L293D was very picky and would stop working if under 4.5V ( battery strain with only 4 cells ), but as for the control logic, the 3.3V HIGH signals from the msp430 worked fine for the logic inputs on the L293D.
  5. Thanks for the great advice @@jpnorair ! I love taking things apart to find out how they work ( been doing that forever it seems ) and "taking apart", well seeing how the processor is doing things at a lower level is definitely interesting to me. I may try doing some assembler with msp430-as, the assembler that comes with mspgcc. I am trying to learn as much as I can with the resources I have, so far making projects is how I learn best. Currently am thinking of making a wireless sensor node inside a cheap solar garden light maybe using a nrf24l01+ module, but am likely going to implement i
  6. Recently finished my first msp430 based robot, a Basic Light seeker! This was a project to get me to learn more about the MSP430 microcontroller. In this project specifically, using multiple ADC inputs and PWMs ( 2 PWMs was a little tricky on the MSP430G2452 but eventually got it ). The robot turns according to the difference between the light values on the left and right, using two Photoresistors/LDRs. The robot is powered my a set of 4 to 5 NiMH 1.2-1.4V batteries which directly power the l293d Motor Driver IC and DC motors, and is also fed into a LP2950-33 3.3V LDO to provide re
  7. @@SixSixSevenSeven @@dubnet @@Fred Yeah, I wasn't too confident about the MSP430 breadboard breakout, but was just interested. The 3.3V LDO board is small enough that I may squeeze it in the extra space with some later PCB designs. It is only around 3x1cm so could fit a couple in a 5x5cm board or in the empty areas on a 10x10cm board fabrication. When I design some other boards to get fabricated in the future I will probably add some of these small LDO boards in the layout. If I made a SMD version I could fit even more, just haven't ventured into SMD quite yet ( but some g2210
  8. This is a project I made while I was learning about the MSP430's ADC10 peripheral and messing with multiplexing of 7-segment LED displays. It is a test bed for analog sensors where the 10-bit value of the analog input on the MSP430 mcu ( a MSP430G2252 in this case ) is displayed on two 2-digit 7-segment displays, which are being driven via a TPIC6B595N Power Shift register ( the SPI is currently bit-banged ). This has come quite handy for testing sensors quickly for my robotics projects and such. Here is my blog post that goes into the project in detail: http://emdinventor-blog.tk/msp430-
  9. I have been working on a breadboard compatible Launchpad-based board for the DIP value-line MSP430s. I have finished an initial design in KiCAD, and am wondering if there is enough interest in this product before I get any PCBs fabricated, and to gauge how many I should produce. The main focus is to make MSP430G2 launchpad - like board that eases prototyping on a solderless breadboard, making small robotics platforms, etc. I originally designed this because I rarely use the Launchpad + boosterpack scheme, but instead usually use a value-line DIP ic on a breadboard and use the Launchpad's SB
  10. Hey, I am a rising high school senior who has been messing around and tinkering with electronics for as long as I can remember, soldered some kits starting in 3rd grade, first got introduced to programming with an Arduino about 2 years ago, Linux with a Raspberry Pi 1.5 years ago ( and then started tinkering with computers from my school's e-waste and installing Linux on everything, experimenting with running servers and SysAdmin stuff ), and now digging deeper into microcontrollers without the Arduino or Energia IDEs and their abstraction. Just finished my first robot ( a basic light seeker )
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