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blankfield last won the day on May 21 2017

blankfield had the most liked content!

About blankfield

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  • Birthday 07/23/1987

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  1. OK nothing has happen because I'm interested in TMP006 boosterpack. Some time ago I've bought some TMP006 IC's and they still haven't been assembled onto PCB. I'll send my address via PM. Thanks for clarifying this situation and for interesting prize.
  2. According to last PM message I'm putting my question here, "Hi Bluehash, Is there a reason for skipping me in contest results? All the best, blankfield"
  3. Really nice project especially from software side, Android is fantastic OS because of free development add-on for eclipse. If you're using UART it is easy to make wireless communication via bluetooth. I did something similar with this module and based on this Java code - it's good point to start with android.
  4. It's time to submit own project for the POTM contest. It will be my first attempt . Project name: ATX2CHARGER Short description: Switch your ATX into a car battery charger with msp430g2553 Link: http://forum.43oh.com/topic/2906-atx2charger-switch-your-atx-into-a-car-battery-charger-with-msp430-updated/?p=24584 Karol (aka blankfield)
  5. Hi, my project basis only on modification of some feedback resistors, no need to play with trafo. Up to ~17V for typical ATX PSU is maximum value. Above this value you need to rewind or made a new transformer. In my opinion it's to tricky, especially to disassemble fragile core (2 "E" shapes glued together).
  6. Thanks for advice, probably I'll made small transformer on toroidal ferrite bead with symmetrical output and primary:secondary 1:3 ratio, should be ok and can be drive via small mosfet from stellaris MCU.
  7. These mistakes are caused by the scheme organisation, divided into several pages and on the most important page is not clearly enough. TxD RxD pin connections are presented deeper, on page with debugger circuit. Which is trap for young players ;-) . Maybe we should make better schematics, without netlist labels and only for msp430gxxx section, which is most important for beginners. Schemes etc: www.ti.com/lit/sw/slac437a/slac437a.zip
  8. I'm working on few projects based on msp430 and recently on lm4f Stellaris. Year ago I've left atmel AVR for TI mcu's and I'm happy of this Cheers ~blankfield~
  9. Hi, i'm looking for simple solution to convert 5V USB to 8-15V simetrical but at least 50mA output. Anyone have a idea do this as simple as possible? I've tested solution with max232 IC - source of simetrical +-8V but current is too low. I will be gratefull for all ideas.
  10. In few words it depends on kind of PWM switching controller which ATX supply is using. I have tested models with TL494 and SG6105 IC's both with success. At first you need to remove all components from 3.3V, 5V, -5V rails, then "upgrade" components in 12V rail to new required voltages and power. After this and based on datasheet you need to provide correct voltages on feedback inputs of switching controller basically from resistor dividers, this step bypass OV, UV, OVC protections for missing rails. Via value change in resistor dividers of feedback it's easy to set output voltage. When I fini
  11. In case of wrong polarity with mosfet switched on, a car battery can provide lot more amps. In this case current is limited only by series resistance of battery, wires, Rds(ON), atx transformer secondary side winding etc. I've made some simulations and conclusion is only one: don't switch this mosfet when battery is in wrong polarity, it's easy to make software protections for this situation. Wrong polarity for circuit is safety, I don't want to add reverse protection diode on high current path because of power losses.
  12. Hi, This is only maximal voltage to drive mosfet (Uds) to achieve desired current. PWM will drop this value. I've made test with resistive load and light bulbs but not with battery, I've measured up to 9A not more because my DMM limit. I have to add some reverse protection diode's on ISENSE and USENSE in parallel and one diode in series with 5V rail. This should protect msp430. MOSFET should protect secondary side of atx, I have to make some simulations in LTspice to check this. I didn't mention that charge process is started only when at least 2V (positive = good po
  13. Hi everyone, I have idea to use msp430 and hacked atx power supply as a car battery charger. Simply msp430 will be used to control of charge process, different charging current, time, precharging and swichable load for accurate voltage measurement will be available. Done: * hacked atx to 17V * enclosure * schematics * pcb * functional code To do: * firmware development If anyone have some suggestions fell free to post within this topic, I'll be grateful. Simple description of operation: At first voltage measurement is initiated, user set type of car battery, capacity and charge strat
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