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H Farhard,
Thanks for your comment. I managd to find some examples.. I now want to download it and see it working..better yet..if i can run my program without linux screen poppin up.. that is where the prob is..
I will keep on trying and keep you updated on this..
best,
Isurug
Hi all,
I recently bought a SBC with above arm 9 chip. Linux, Qutopia pre-installed (http://www.developmentboard.net/index.php/productdetail/Development+board/ARM9/SAMSUNG/S3C2440/MINI2440+with+3.5%22+LCD/info/1). looks really nice. now I want to play around with it. There were lot of docs...
Thank you all!
I solved the problem with MAX1705, a very reliable SM boost converter. gives very smooth 5V and 3.3V even from a nearly dead battery. recommend for other similar applications where the power does not exceed 800mA.
Re: car counter
Hi, So in where are you plannig to implement your car counter? I mean in which scenario are you planning to use it (multiple lane road, single lane entry road, just cars without other traffic etc). Once there is a clear prob definition, it is easier to suggest ideas.
-Isuru
recovery time diode
hi chepot,
Trr=sqrt(2*Qrr/(di/dt))
I approximated Qrr with the given data, which is a good estimation. now you still cannot get Trr, unless you know di/dt. that is what i was telling. suppose that you know di/dt (which is very hard to get an accurate value due to...
reverse recovery time diode
Hi chepot,
Qrr = Irr X trr approximately. in ur case Qrr= 1A X 100ns which is a rough estimation. di/dt really depend on your current path eg. if theres an inductor di/dt=v/L etc. thus to have a precise value, u need to simulate. but the bottom line is the max trr...
schematic of pic18f2620
this until the photo Tr is off the logic level at the output is high. connect it to one of the ext interrupt pins Port b (pin 1,2,3 ) and generate an interrupt when the pulse level goes to low (set ext_h_L). and u can use a variable in the program to count the pulses...
reverse recovery time of diode
it depends on how fast you are switching.. trr means that
in Maxim website:
Definition
When switching from the conducting to the blocking state, a diode or rectifier has stored charge that must first be discharged before the diode blocks reverse current. This...
Re: 12V Microcontroller
its not only power dissipation, but also the speed makes the manufactures to go lower voltages as it takes little time to switch between the logic levels...
but you stil can use standart uCons with ur 12V level components with proper techniques..
Hi all,
I would really appreciate if anyone of you could shine some light on me on getting started with ARM programming. I recently browsed for some hint on the net and alas..there are no clear idea there also.. I hit with GNUARM and Yagarto and eventhough I tried to setup a development...
---> ReadTemp(&MyTemp[0]); //store the value in the MyTemp[0] element of the array
tp = MyTemp[0] >> 1; // right shift the value by 1bit and store the result in tp
tpd = ((MyTemp[0] >> 1)&1) ? 5:0; // if ((MyTemp[0] >> 1)&1) is true
return 5
else return 0;
hope this helps..
Hi,
Can anybody give me some hint of a good sepic/step-up power supply chip for powering a cct with 5V from Li-Polymer batteries? I tried it with TPS61130 and it is very unstable :(
-thank you!
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