i was using arduino uno to program attiny85, it worked firstly then i got this error
Sketch uses 1426 bytes (17%) of program storage space. Maximum is 8192 bytes.
Global variables use 21 bytes (4%) of dynamic memory, leaving 491 bytes for local variables. Maximum is 512 bytes.
"C:\Users\Dyaa\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude" "-CC:\Users\Dyaa\AppData\Local\Arduino15\packages\ATTinyCore\hardware\avr\1.3.3/avrdude.conf" -v -pattiny85 -cstk500v1 -PCOM6 -b19200 "-Uflash:w:C:\Users\Dyaa\AppData\Local\Temp\arduino\sketches\DDFF2AF34CA83FC3A5F3C2309CEA83C5/sketch_nov19a.ino.hex:i"
avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Users\Dyaa\AppData\Local\Arduino15\packages\ATTinyCore\hardware\avr\1.3.3/avrdude.conf"
Using Port : COM6
Using Programmer : stk500v1
Overriding Baud Rate : 19200
Setting bit clk period : 5.0
AVR Part : ATtiny85
Chip Erase delay : 400000 us
PAGEL : P00
BS2 : P00
RESET disposition : possible i/o
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 12 4 0 no 512 4 0 4000 4500 0xff 0xff
flash 65 12 32 0 yes 8192 64 128 30000 30000 0xff 0xff
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00
lock 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
lfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
efuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
calibration 0 0 0 0 no 2 0 0 0 0 0x00 0x00
Programmer Type : STK500
Description : Atmel STK500 Version 1.x firmware
Hardware Version: 2
Firmware Version: 1.18
Topcard : Unknown
Vtarget : 0.0 V
Varef : 0.0 V
Oscillator : Off
SCK period : 0.1 us
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.02s
avrdude: Device signature = 0xffffff (retrying)
Reading | ################################################## | 100% 0.02s
avrdude: Device signature = 0xffffff (retrying)
Reading | ################################################## | 100% 0.02s
avrdude: Device signature = 0xffffff
avrdude: Yikes! Invalid device signature.
Double check connections and try again, or use -F to override
this check.
avrdude done. Thank you.
Failed programming: uploading error: exit status 1
i thought the problem is from the attiny85 or the uno so i ordered a new arduino nano and new attiny85 and same error,
i measured the voltage between the 5v pin and gnd = 0v, the voltage from gnd to any other digital pin = 0v (same output voltage in both board 0) is it normal?! if normal why i get this error while programming the attiny
note i can upload any sketch to any board without and problem