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--- hardware:attiny85 [2021/04/12 04:22]
nanodano created
+++ hardware:attiny85 [2021/04/13 02:01] (current)
nanodano
@@ Line 4: / Line 4: @@
   * Official product page: [[https://www.microchip.com/wwwproducts/en/ATtiny85]]
 ===== Wiring/Pinout =====
 SparkFun has a nice pinout diagram: https://learn.sparkfun.com/tutorials/tiny-avr-programmer-hookup-guide/attiny85-use-hints
+SparkFun also has a nice one-page PDF reference guide for ATtiny85: [[https://cdn.sparkfun.com/assets/2/8/b/a/a/Tiny_QuickRef_v2_2.pdf]]
 <code>
@@ Line 14: / Line 17: @@
  Reset  1 -o==- 8  5V
- A3/D3  2 -   - 7  D2/A1
+ A3/D3  2 -   - 7  D2/A1 (SCK)
- A2/D4  3 -   - 6  D1 (PWM)
+ A2/D4  3 -   - 6  D1 (PWM, MISO)
- GND    4 -===- 5  D0 (PWM)
+ GND    4 -===- 5  D0 (PWM, MOSI, AREF)
 </code>
@@ Line 22: / Line 25: @@
 ===== Programming =====
-Use an Arduino as ISP to program the ATtiny85.
+Since the ATtiny85 has no USB plug for serial over USB, you can use an Arduino UNO as an inline serial programmer (ISP) to flash the ATtiny85 with a sketch.
+  * Nice YouTube video by Mitch Davis on programming Attiny85 [[https://www.youtube.com/watch?v=N591sLGYWnM]]
+Wire up the Arduino UNO to the ATtiny85 over GPIO pins.
+Also add a 10uF capacitor between RESET and GND in the Uno (anode to ground) to prevent the upload causing the board to reboot.
+<code>
+    Uno:ATtiny85
+=======:========
+V:Gcc
+    GND:GND
+ Pin 13:Pin 7 (SCK)
+ Pin 12:Pin 6 (MISO)
+ Pin 11:Pin 5 (MOSI)
+ Pin 10:RESET
+</code>
+The MISO, MOSI, and SCK pings are used for SPI communication.
+In the Arduino IDE, set the target board as the ATtiny85 1MHz speed. And select for the Programmer: Arduino as ISP. If you need to add the board, add this URL to your board manager: [[https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json]]

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