I tried to proceed as " TOOLS->TROUBLESHOOT Its returning "calibration cannot be done. In VDD & calibration dialog i am not able to do calibration. As soon as i open pic kit 2 application the error window saying "VPP error" pops outĢ. Heating problem of inductor gone away after i replaced the 2N3094 transistors.ġ.
CANAKIT USB PIC PROGRAMMER PIN SERIAL
I am successful in downloading the firmware into 18F2550 via serial programmer and Pic Kit clone is detected in PC. I did the pic clone referring your guidelines here. Good work, Gaurav!īefore i start i shall express my sincere Thanks to You for all the works :)Īm a newbie to PCB and schematics like these and i know nothing on this. Now everything works as charm (Vdd, Vpp, calibrating, programming). The USB voltage may be too low to completely calibrate." does occur. Although the hint in Pickit 2 says "4.000", the comma is just fine, otherwise an error "Could not fully calibrate the unit.
when inserting the measurement 4.x Volts (e.g. This also depends on the type of the BD140 transistors used.Ī hint: if you stay in country where the decimal delimiter is comma (,), not punctuation (.), try to use comma when calibrating in Pickit2 -> Tool -> VDD Calibration. Normally the R24 should be 10x R25 (1k) but I stayed as low as possible. 330E is simply closing the Q3 (BD140) too soon. This helped to get the voltages down to 2.5V. This helped to be able to adjust Vdd from 4.97V down to 2.7V (not to 2.5V!) Changed LM358 to MCP6002 (rail-to-rail op-amp, very cheap) Removed R36 (which does not exist in latest HW version)Ģ. Built the board even before R36 (240E) was removed but faced some problems regarding Vdd calibrations.Here is the summary what I changed in order to pass all tests successfully:ġ.
Just want to share some of my experiences.
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