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this makes no sence, why you need more power on the input side?emcs51 said:hi Andy_123
that is for increase buffers power!
evc said:First let me tell you what terrific work you've done so far! Congratulations!
And my question (it's more like suggestion) is - Why we don't try to put it all in one microcontroller - PIC18F4550? My idea is to load the operating system (originaly dedicated to be written into 16F877(A) ) into PIC18F4550's RAM (it will be enough, i think). And then the software of the 18F4550 to act like interpretator for this operating system. The only fault will be that you have to download this operating system every time when you switch on the power supply of ICD2, but the download will be much more faster. I think i can do it, only if i knew the comunication protocol between PC and ICD2. Any way, i will try to do it, with your support or without, but i like team play and think it will be fun. Unfortunately i have lately much more work then i would like to, so i don't know when it will be possible to visit this forum again, but still hope to receive some sign from you!
I like the idea of one PIC, instead of two, and I own a PICKIT2. Me being a person who like to take things apart, the first thing I did was to of course take apart the PICKIT2. It uses a 18F2550, and has two 24LC512's, which I believe are for temporary program storage space (correct me if I am wrong). Would it work to have MPLAB upload code to the ICD2, which would load it into the memory, and then program the target, then switch over to the debugger?
Thanks for your help in advance,
Benjamin B. Roy
wonbinbk said:To Chamera:Chamera said:If I'm looking at the right schematic (they are all pretty much the same thing) L1 on the USB port is to filter the power for the board. See "Choke"
L2 is used for the DC step-up converter to supply higher voltages for MCLR on some IC's
If you really want to make the inductors, you need a multimeter or similar device capable of measuring the inductance as you wind it. Try to use a core, I've found the air-wound inductors I've used in PLL systems are near telepathic. Think a bad thought and it stops working!
If the inductors are a problem, you can always use a external power supply for the reference voltage until samples arrive.
Thank you very much, I have found the inductor. So, my problem is solved. Thank you!
Here is my PCB, schematic redraw, all in pdf. I hope I can give a hand to this thread. And hope it is useful for all of you.
The Header-4 pin is the USB connector, just solder 4 wire of USB cable on it. The Header 6 pin is ICSP header which its first pin is MCLR.
The Firmware is downloaded in PiCs post.
C1 is to filter the target Vdd voltage, you can use 100nF. For testing i have used 470Ω as R2, and 3.3mH as L1 with Isat=240mA.MPi said:What is value of the R2 and the C1 on your last schematic? (mert ez lemaradt!)
wonbinbk said:Here is my USB ICD2 PCB! Now, with small dimension in one layer, it has only 8 jumpers.
I have tested it. It works like a BMW car! Hehe! All the value of Components is OK.
Note: I use schmatics PICs had posted. With no VPP regulator
wonbinbk said:Here is my USB ICD2 PCB! Now, with small dimension in one layer, it has only 8 jumpers.
I have tested it. It works like a BMW car! Hehe! All the value of Components is OK.
Note: I use schmatics PICs had posted. With no VPP regulator