put SMD cream, 4 SMD components, make a
reflow process – or solder by hand
press and solder SubD receptacle keeping ½ mm gap between PCB and SubD shroud
Align and solder USB receptacle (see helper tool),
solder the pins with lowest possible iron temperature
電解コンデンサを装備 as flat as possible
Align and solder the LED using the shell, watch for right polarity
ショート回路の5 Vとグランドの間をチェック again
Check “operation” by connecting the USB cable, must show as
“inoperational USB device”, this is the power supply for programming
parallel portに連結する、 and program the bootloader
PonyProg: load main.hex, write,
set fuses as shown here
WinAVR: invoke make fuse flash lock
let install driver usb2lpt.inf
Scratch jumper SJ2 (the only solder jumper on silk-screen-less lower PCB side)
Kurzschlusstest.exeを呼び出す、 make corrections if necessary
Close shell, make a final check
The crystal and the both 22 pF capacitors are not to populate
Population with ATmegaX8 is currently not recommended.
If you want ATmega48 population, R1 should be 4.7 kΩ,
and the older firmware USB2LPT5 must be used.
A bootloader cannot be used (this chip has no bootloader support)
If D2 (BAV199) is used, R1 must be 1.5 kΩ
This revision 6 (USB2LPT 1.6) has 3 pre-connected solder jumpers:
SJ1 can assign power to pin 25 of SubD receptacle:
open: Pin 25 unbeschaltet
right connected: Pin 25 to ground (default)
left connected: Pin 25 to 5 volts
If power is needed, populating a self-resetting fuse is highly recommended.
SJ2, connected at PCB fabrication,
scratched at device manufacturing: activates the RESET pin of ATmega
for programming the microcontroller.
SJ3, connected by default, scratch when you want
3.3 volts operation of ATmega8 (e.g. for safer JTAG connection),
populate a BAV199 and change R1.
Moreover, scatch it to measure device's current consumption and re-solder.