Incomplete documentation of auto-reset disabling capacitor in Arduino as ISP tutorial

[dvarrel]

Hi,
thanks for Arduino as ISP and Arduino Bootloaders Tutorial

for some arduino nano (old bootloader), it's necessary to put an 1µF capacitor between RESET and Ground to burn new Bootloader.

best regards

[per1234]

Are you referring to this tutorial?
https://www.arduino.cc/en/tutorial/arduinoISP

This may be a duplicate of #8032. However, I have wondered about how that tutorial shows the capacitor used on the Mega, but not on the Uno used as Arduino as ISP. Is there something about the Mega that makes the capacitor more likely to be needed? Using the stk500v1 protocol, I have never needed the capacitor on any board I've used for Arduino as ISP.

Perhaps it would make more sense to change the tutorial to show the Mega without capacitor, but then add a note that if you're experiencing such and such error, try using a capacitor. It would be safest to always use a capacitor (since it does no harm). However, I think it's best for the tutorial to recommend it only when absolutely necessary because it increases the complexity of a process the average Arduino user finds already extremely difficult. Many Arduino users don't happen to have a suitable capacitor on hand, though they may very well have a spare Arduino board and jumper wires.

Related: http://forum.arduino.cc/index.php?topic=591024

[dvarrel]

hello, yes you're right, no capacitor on mega and a note will be sufficient and will make more sense I didn't see the capacitor on the mega board, because i was using a uno !!! thanks a lot Le lun. 7 janv. 2019 à 02:45, per1234 <[email protected]> a écrit :

…

Are you referring to this tutorial? https://www.arduino.cc/en/tutorial/arduinoISP This may be a duplicate of #8032 <#8032>. However, I have wondered about how that tutorial shows the capacitor used on the Mega, but not on the Uno used as Arduino as ISP. Is there something about the Mega that makes the capacitor more likely to be needed? Using the stk500v1 protocol, I have never needed the capacitor on any board I've used for Arduino as ISP. Perhaps it would make more sense to change the tutorial to show the Mega without capacitor, but then add a note that if you're experiencing such and such error, try using a capacitor. It would be safest to always use a capacitor (since it does no harm). However, I think it's best for the tutorial to recommend it only when absolutely necessary because it increases the complexity of a process the average Arduino user finds already extremely difficult. Many Arduino users don't happen to have a suitable capacitor on hand, though they may very well have a spare Arduino board and jumper wires. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#8368 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AGQWTb1OGJeGNpiTO0db3j5UbheJ-N-kks5vAqa7gaJpZM4Zyf54> .