i will build the brenner8 programmer but befor build it i need to know somthing , i dont have pic18f2550 and i search all electronics store here but
cant find it , so can i use pic18f4550 instead of pic18f2550 ?
offcourse i will assign the right pins to the new pic18f4550 ,like ra1>>ra1
rb2>>rb2 etc . .
and anyone here have any problem with it ? i only will program "pic184550" .
Yes the 18F4550 will work, and don't build the brenner8. Instead build a PICkit2 clone (nearly the same amount of parts and a far far better programmer and debugger with MPLAB support etc, etc...)
You can use the 18F4550 in a PICkit2 clone too, I did. **broken link removed** Prototype PICkit2 compatible using a 18F4550
It's in the Junebug manual, just build the top part above the green line in the schematic.
You can omit the 2N7000 and the BS250 (jumper the D & S) if you want to keep it simple.
The firmware is part of MPLAB and documented in the manual. You also need MPLAB 8.01 and the PICkit2 software are both supported.
yes i found the firmware called "PK2V021000.hex" , and offcourse i will burn it to the blank pic18f4550 . and all is done , or i have to change anything in the firmware ? . thanks
yes i found the firmware called "PK2V021000.hex" , and offcourse i will burn it to the blank pic18f4550 . and all is done , or i have to change anything in the firmware ? . thanks
Nope it'll work as is. It'll even automatically update in MPLAB. Nice programmer you'll like it I'm sure. You even get a free UART tester! (USB to serial TTL) under the tools menu in the PICkit2 software. Of couse the debugger alone is great.
Yes burn that firmware onto the 18F4550, MPLAB 8.01 has even newer firmware and it will update the PIC just fine to PK2V020200.hex (it's part of your MPLAB install)
Your PICkit2 compatible will automatically update itself, even if you burned version 1.1 of the firmware on it. (actually 1.1 can recalibrate 12F675 PICs a feature that has been dropped in V2)
Just skip them, the BS250p can supply 230ma both are used only for VPP before VDD and is only needed in some situations.
So for now just place a jumper across the DS250 D,S When you can get a BS250 then solder one in.
my device "pic18f4550" not detect , it say "pickit 2 vpp voltage level error .
check target & retry operation" .
but note i change the 2n3906 by bc557 and the coil with another one " i dont know its value but its like the capacitor in size "
so what can i do now ?
any idea
Well that's the problem. 470uH thru 680uH should work, but the coil is important. The BC557 should be fine. The VPP cap can be 22uF thru 47uF.
A too small inductor won't work.
my device "pic18f4550" not detect , it say "pickit 2 vpp voltage level error .
check target & retry operation" .
but note i change the 2n3906 by bc557 and the coil with another one " i dont know its value but its like the capacitor in size "
so what can i do now ?
any idea
18F4550 has a 18F2550 compatible mode, so it is doable.
For more PICKit2 assembly and trouble-shooting during the DIY process, you can reference my site as:
Hardware CB0703(enhanced PICkit 2): **broken link removed**
Step by step assembly guide for PICkit2 DIYer : **broken link removed**
FAQ: Q3-Q6: **broken link removed**
i build that in the picture , but i omit the icd pins "i dont use it" am using the other vpp gnd pgd pgc u5v at the buttom , and omit the "con3" ,and bs250 .
can this work normally ? or not ? and plz any solution for this coil .