Quick one this time....I have posted a few projects lately that incorporated a Raspberry Pi Pico, rotary encoder, and .96" OLED: here, here, and here. To make it unnecessary to breadboard the hardware, I posted an "experimenters board"--a development board to enhance a RP Pico.
Just now I updated the KICAD and Gerber files to the PCBWAY community site salient to the posts: go here.
The 9-29-24 experimenter's board uses less components, incorporates the encoder debounce library here, superceding the slightly less responsive CD4011 based hardware debouncing discussed here.
All in all--if we can do something in software, do it in software, right?
For now it all works.
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| Thanks to Wendy and the gang and PCBWAY for patiently providing revised PCB's. You can help this blog by checking 'em out. |
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| 9-29-24 revision |
To make sure the grounding issues I saw with earlier revisions was a function the PCB's layout, not the schematic nor code, I breadboarded put the entire "dev board for a dev board":
The breadboard worked every time.
I thought trace layouts for low frequency audio wasn't terribly important--put things almost anywhere, thrown in whatever traces you want--it will work--we are the bottom feeders?
Wrong. Apparently the I2C traces (at the very least) needed to be treated with forethought.
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| Previously: more narrow traces....no ground pour |
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| 9-29-24 design improves that. |
I found myself putting the 9-29-24 assembly on hold for a couple of weeks, partially because I was pretty tired of revising the board, and also having a feeling (an incorrect one, fortunately) that the 9-29-24 revisions would make things less reliable, not more.
Word of caution: 1306 128x64 .96 OLEDs are everywhere, but there appear to be 2 different pinouts coming from Shenzen: GND far left, and VCC far left.
My design requires VCC on the far left--make sure you get that style of OLED if you build this project.
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| Spinning the rotary encoder advances or diminishes the counter on the OLED as expected. Every time. Thank goodness. |
Next: I have augment the code to create a user interface for the frequency counter....yes, I will get to that someday, but it means a lot of code changes.
For now it's back to my day job--for better or worse the Pandemic is over.
