I'm lazy and dont like to convert values in my head while programming or use windows calculator so I made a standalone widget!
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Hex-Bin-Dec_Converter.hexCompiled Firmware Hex File (remember to set 8MHz internal oscillator and disable brownout detect fuses!!!)hex - 31.73 kB - 08/04/2020 at 16:46 |
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Hex-Bin-Dec_Converter.inoArduino C Firmware v1.0ino - 12.81 kB - 08/04/2020 at 16:42 |
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unit converter.schEagle Schematicsch - 629.25 kB - 08/04/2020 at 16:41 |
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unit converter.brdEagle Board Layoutbrd - 120.72 kB - 08/04/2020 at 16:41 |
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unit converter_2020-08-04.zipPCB Gerbers v1.1 - Fixed missing vias for '8' and 'A' Buttonsx-zip-compressed - 274.11 kB - 08/04/2020 at 16:40 |
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Just a quick update as I still use this device nearly every day for a few minutes, and by my count it's been running for nearly 1 year and three months off the same battery I put in it when I assembled it! So that actually puts it right in line with my original 1.5 year estimation! Now it is apparent that the battery is getting quite flat at around 2.8V or so and the display is getting dim with the falling voltage so I'm not very confident it'll hold on much longer without a battery swap. Overall I'm pretty happy with the runtime especially considering how often I use the little guy.
*my phone camera makes the display look a little brighter than it does in real life
Special Thanks to JLCPCB for sponsoring this project. JLCPCB Prototype for $2 (Any Color): https://jlcpcb.com
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Very nice! I like the user interface display on the oled. It's much easier to use than the Windows calculator.
Very cool! Is that your programming port next to the processor? you must have some sort of pogo pin fixture along with it then.
Yep, I designed a little pogo to 0.1" header board that I use to flash chips in circuit.
What's the white square component behind the power button? Do you have a dual soft latch and slide switch for the power?
It's a piezo speaker for making a beep when you press a button. The switch is for disconnecting the battery for long term storage, but even when left on in standby I estimate it'll last over a year and a half on a standard cr2032.
Ah yes, the power button is a hw interrupt wake button then?
Nifty piezo. I usually see them in flat square form factor. Anything special about this kind?
Yep, pin change interrupt. I pulled the piezo from an old beeper ages ago, nothing special about it as far as I know.
Nice! At some point in the past I wanted a CIDR calculator but those days are past.
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do you have the stl files for the case?