Search found 39 matches

by Hans61
Yesterday, 13:01
Forum: Hardware and software hacking
Topic: Pluggy Reloaded
Replies: 147
Views: 54654

Re: Pluggy Reloaded

I also thought of stm32duino, the code could be taken 1:1. The software for the USB keyboard is not that simple I think. I've only found one example of it so far, but haven't had time to try it out yet. The second thing would be the connection to a PC (USB->serial) would be nice if the STM could do ...
by Hans61
Yesterday, 10:17
Forum: Hardware and software hacking
Topic: Pluggy Reloaded
Replies: 147
Views: 54654

Re: Pluggy Reloaded

I've been thinking about a Pluggy Reloaded 2 based on an STM32 for a while now. I still have a "Blue Pill" with the STM32F103C8T6 lying here (bought a long time ago for 2$). The chip has 2x USB and at least one of them is host capable, which means you could connect a USB keyboard directly....
by Hans61
Yesterday, 09:52
Forum: Hardware and software hacking
Topic: Video Repeater
Replies: 26
Views: 2024

Re: Video Repeater

Yes I can add a few more LED's for different signals, that is also useful for troubleshooting. I really only have the MCP23S17 on the expansion for one reason, to have the ability to switch video modes (3/4 lines) via software. I have read through the "Expansion bus" post (https://forum.gi...
by Hans61
Yesterday, 08:48
Forum: Hardware and software hacking
Topic: 6Bit audio:
Replies: 19
Views: 2138

Re: 6Bit audio:

Thanks for the information. I will deal with it and try to realize a feasible solution for it. (the parts mentioned above don't really seem to be available). Since the audio expansion is autonomous (independent of the expansion board) I will design two separate PCB's that fit side by side and can be...
by Hans61
14 Oct 2021, 19:55
Forum: Hardware and software hacking
Topic: 6Bit audio:
Replies: 19
Views: 2138

Re: 6Bit audio:

A circuit for a test board, with 8 bit audio, might look like this:
8Bit audio.sch.png
8Bit audio.sch.png (25.54 KiB) Viewed 90 times
I still want to test it. If it works I will integrate it on the expansion board.
IC2 is the adapter to the Gigatron.
by Hans61
13 Oct 2021, 19:48
Forum: Hardware and software hacking
Topic: Video Repeater
Replies: 26
Views: 2024

Re: Video Repeater

Here is an intermediate stand. I have tested the prototype of the current board. Except for the two missing GND connections, which I fixed with two wires on the bottom, everything seems to work. I've attached a few quick cell phone pictures. A short cell phone video can be found here: https://www.yo...
by Hans61
12 Oct 2021, 20:31
Forum: Hardware and software hacking
Topic: Video Repeater
Replies: 26
Views: 2024

Re: Video Repeater

With the 100mm x100mm limit, I was referring more to the price at the PCB manufacturer. For me, this is not really decisive, but for the wider distribution, I think so. I currently have JLCPCB manufacture, there it does not hurt so "hurt" if one has made a mistake. My first version of the ...
by Hans61
12 Oct 2021, 05:57
Forum: Hardware and software hacking
Topic: 6Bit audio:
Replies: 19
Views: 2138

Re: 6Bit audio:

@alastair Sorry, I think I have to correct myself. If I understand correctly, the low pass is mainly influenced by 2R and C43, the high pass consists of C44 and R10. So you don't have to change the filter.
by Hans61
09 Oct 2021, 11:03
Forum: Hardware and software hacking
Topic: 6Bit audio:
Replies: 19
Views: 2138

Re: 6Bit audio:

I am not so audio affine, but the sound and the video impress me. Since it's 4 bit we may as well refrain from expanding it. @alastair I am an electronics engineer. I don't know much about audio technology. Impedance is the AC resistance, for resistors it is the same as ohmic resistance. If I replac...
by Hans61
09 Oct 2021, 10:23
Forum: Hardware and software hacking
Topic: Video Repeater
Replies: 26
Views: 2024

Re: Video Repeater

@lb3361 thanks for the info, it took me some time to understand the GCL notation and thus the code. I have now managed to connect the MCP 23S17 to the Gigatron and have 8 LED's flashing. https://www.youtube.com/watch?v=DepDiEJabMI Here is my code: ; 00111100 0x3C all off ; 00110100 0x34 /SS1 active ...