Retro Gaming Handheld Without a PCB -- Episode 384

Retro Gaming Handheld Without a PCB

element14 presents | davedarko's VCP Profile | Project Videos

Dave is a big fan of freeform soldering styles and made a tiny skeleton handheld. As the wise Ben Heckendorn said years before, Dave too tells everyone to collect spare LED legs. "Don't throw them away, as they might come in handy one day!" - or they get stuck in your maglock sockets. Here we need them to connect an Attiny85 with some buttons and an I2C display.

Supplemental Content:

Learn more about Charlieplexing: The Charlieplexing

For more on resistors checkout Karen's The Learning Circuit 17: Resistors

Now encased in Resin:Episode 384: Skeleton Handheld is now encased in resin!

Bill of Material:

Part
ATTINY85-20PU	MICROCHIP	1	Buy Now
6MM TACT SWITCH	ALCOSWITCH	5	Buy Now
SPDT SLIDE SWITCH MFS101D-14-Z	NIDEC COPAL ELECTRONICS	1	Buy Now
MF25 2K	MULTICOMP	2	Buy Now
MF25 3K9	MULTICOMP	1	Buy Now
MF25 8K2	MULTICOMP	1	Buy Now
MF25 18K	MULTICOMP	1	Buy Now
MF25 10K	MULTICOMP	1	Buy Now
S8421-45R - HOLDER	HARWIN	1	Buy Now
KXG1205 - Buzzer	KINGSTATE	1	Buy Now
IC & Component Socket - DIP8	TE CONNECTIVITY	1	Buy Now

Additional Parts:

Product Name
0.96 inch - I2C OLED display - SSD1306
2mm single core copper wire 1/2 meter

Attachments:

7418.Code.zip
Schematics.zip

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gpsjay over 6 years ago

This looks great! Seeing as I don't have an ATtiny85 immediately available I wondered if this can run on an UNO or a NANO as I have loads of those.

Following the links in the above comments takes me to the Arduino Collection where it claims it is it directly compatible and will run on an UNO, but whilst it compiles and programs OK, I don't get anything on the screen....So am I doing anything wrong or misunderstanding something?

I have loads of UNO's and NANO's and barebones ATmega328P, it would be great if I could use them!

Any pointers greatly appreciated! Thanks.

UPDATE: I have some Digistump ATtiny85 boards, will it work on those??
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gpsjay over 6 years ago

This looks great! Seeing as I don't have an ATtiny85 immediately available I wondered if this can run on an UNO or a NANO as I have loads of those.

Following the links in the above comments takes me to the Arduino Collection where it claims it is it directly compatible and will run on an UNO, but whilst it compiles and programs OK, I don't get anything on the screen....So am I doing anything wrong or misunderstanding something?

I have loads of UNO's and NANO's and barebones ATmega328P, it would be great if I could use them!

Any pointers greatly appreciated! Thanks.

UPDATE: I have some Digistump ATtiny85 boards, will it work on those??
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davedarko over 6 years ago in reply to gpsjay

Hi Jason!

I haven't tested it myself, how did you connect it? Did you use the I2C pins of the Arduino for it (A4, A5)? Or did you use the same pins as the Attiny would use?

It seems as if the digistump can be programmed over the 6 pins of that header, _but_ that will definitely remove the USB functionality and therefore you would need to be able to reupload the firmware to it. Definitely would work - I don't have them at home though, to try.
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gpsjay over 6 years ago in reply to davedarko

Following the connections in the image which shows pin 10 and 8 of the UNO, but I also tried the UNO I2C pins A4 & A5 as well.

For the moment I think I'll stick to the UNO to try and get this to work!

https://sites.google.com/view/arduino-collection/arduino
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