Differences

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--- arduino:arduino_without_a_bootloader [2021/04/22 00:56] – [Case 1: Uno or Nano with USBtinyISP] mithat
+++ arduino:arduino_without_a_bootloader [2021/04/22 01:01] – [Case 3: Pro Mini 3.3V/8MHz with USBtinyISP] mithat
@@ Line 112: / Line 112: @@
 <WRAP center round important 80%>
-**Be careful!**
+**Make sure your USBtinyISP level shifts the I/O before attempting this approach.**
-Version 1 of the Adafruit USBtinyISP has a jumper that disconnects the internal VCC from the programming headers, but it does //not// level-shift the I/O.
+Version 1 of the Adafruit USBtinyISP has a jumper that disconnects the internal VCC from the programming headers, but it does //not// level-shift the I/O. All the thrid-party USBtinyISP clones I've encountered have the VCC jumper as well as the needed circuitry to level shift the I/O. But it's entirely likely that there are some that don't.
-All the thrid-party USBtinyISP clones I've seen have the VCC jumper as well as the needed circuitry to level shift the I/O. But it's entirely likely that there are some old or bargain-basement versions that don't.
-Make sure your USBtinyISP level shifts the I/O before attempting this approach.
 </WRAP>