TZXDuino pico: Difference between revisions
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As the TZXDuino Pico is not much more than a Arduino nano couple to a SD-Card holder, it might also be used for other uses where an Arduino with sd-card interface is needed. | As the TZXDuino Pico is not much more than a Arduino nano couple to a SD-Card holder, it might also be used for other uses where an Arduino with sd-card interface is needed. | ||
== October 11, 2022 the schematic == | == October 11, 2022 the schematic == | ||
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[[File:TZXDuino pico schematic.png|1000px]] | [[File:TZXDuino pico schematic.png|1000px]] | ||
I already had some DM3D-SF Hirose micro SD Push/Pull card holders, but the KiCad Library footprint of the schematic symbol for the cardholder was not an exact match to my DM3D-SF cardholders, so I used the below .PDF file that contains the exact pads of all used components to check the Footpad. when a .PDF is printed on a A4 paper it is exactly 100% correct dimensionally, so after printing the PDF (which wasn't as easy as it sounds) I could check if the pads of the footprint exactly fitted the real DM3D-SF, and luckily they did, so I can now start the layout. | |||
I already had some DM3D-SF Hirose micro SD Push/Pull card holders, but the KiCad Library footprint of the schematic symbol for the cardholder was not an exact match to my DM3D-SF cardholders, so I used the below file that contains the exact pads of all used components to check the Footpad. when a .PDF is printed on a A4 paper it is exactly 100% correct dimensionally, so after printing the PDF (which wasn't as easy as it sounds) I could check | |||
[[File:TZXDuino pico-F Cu.pdf]] | [[File:TZXDuino pico-F Cu.pdf]] | ||
Revision as of 23:42, 12 October 2022
| Project TZXDuino Pico | |
|---|---|
| |
| building a tiny cassette recorder replacement device that can fit inside a sinclair spectrum | |
| Status | Initializing |
| Contact | mahjongg |
| Last Update | 2022-10-12 |
For the nationaal VideoGame Museum in Zoetermeer, (https://www.nationaalvideogamemuseum.nl) I'm designing a version of the TZXDuino (a cassette replacement device) that is stripped down so much that it fits INSIDE a ZX-Spectrum. A normal TZXDuino has a row of 6 or so 6x6mm buttons, and either a 16x2 character LCD (with a I2C backpack) or a tiny I2C driver graphical screen such as were used in "candy-bar" phones like the NOKIA 3310. The tiny (1 by 1 inch) OLED screen must have an I2C interface. For my application a screen was unwanted and only two buttons (Up, and Play) were needed. Also I discovered that the LM386 speaker driver used to buffer/amplify the Cassette input signal was completely unnecessary. All Barrel and jack plug connectors were replaced with simple hard wire contacts, the "autostart" connection is not used in a spectrum, but might be used in a home computer with a built in cassette deck. Like a CPC646.
As the TZXDuino Pico is not much more than a Arduino nano couple to a SD-Card holder, it might also be used for other uses where an Arduino with sd-card interface is needed.
October 11, 2022 the schematic
File:TZXDuino pico schematic.pdf
I already had some DM3D-SF Hirose micro SD Push/Pull card holders, but the KiCad Library footprint of the schematic symbol for the cardholder was not an exact match to my DM3D-SF cardholders, so I used the below .PDF file that contains the exact pads of all used components to check the Footpad. when a .PDF is printed on a A4 paper it is exactly 100% correct dimensionally, so after printing the PDF (which wasn't as easy as it sounds) I could check if the pads of the footprint exactly fitted the real DM3D-SF, and luckily they did, so I can now start the layout.
To power the TZXDuino Pico, normally is done through its micro USB port, but I was planning to power it through the 5V line, but maybe it should be the VRAW input pin, I'm investigating that. If 5V is good enough I can power it through the Display connector, if powering via the VRAW pin is a necessity I have to add one more header.