ATTiny85_BOM.csv

Keep in mind that I have a large stash of headers and female headers and ATTiny85 IC's so these are not included in the BOM. may want to change the 240 Ohm resistor or potentiometer so you can achieve HVSP functionality.

Here's a link to the HVSP tutorial I followed. https://arduinodiy.wordpress.com/2015/05/16/high-voltage-programmingunbricking-for-attiny/

ms-excel - 3.84 kB - 04/15/2021 at 18:06

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ATTiny_85_Circuit_2.zip

better version. made a copy just in case I caboshed my Gerber files and moved onto V3. Here for archival and showing progress purposes.

x-zip-compressed - 8.48 MB - 04/15/2021 at 17:53

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ATTiny 85 Circuit.zip

First attempt at the design. Good start but has some flaws.

x-zip-compressed - 3.86 MB - 04/15/2021 at 17:53

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ATTiny_85_Circuit_3.zip

3rd version with better spacing for AVRISP MKII programmer, Better Micro USB then the surface mount one, added jumpers to be able to disconnect the Zenner Diodes from the rest of the board, added capability for on board HVSP (I soldered the wrong resistor value on the board to get to 12V though. Either need to add a higher value Potentiometer or smaller resistor to the feedback line of the linear regulator.) Also added a way to disconnect from the NPN transistor as well as from the rest of the circuit in case the regulator needs to power something else.)

Also if you modify the circuit and pull the changes into the board layout editor you will need to modify the pinout for the 2n3904 resistor. For whatever reason the default has the base switched with the collector or emitter pins. (This is from the Digikey kicad library.)

x-zip-compressed - 4.63 MB - 04/15/2021 at 17:53

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