It’s a single sided board i’m fabricating my self with the required etching materials.
Why a 16Mhz crystal?
I need the crystal to program the chip, the board is just for testing random led patterns and eventually it may be repurposed so it needs to remain programable.
There are online calculators for trace width depending on length and current. It does not cost you anything to make a wider trace. You should also connect all the CPU GND pins together and all the Vcc pins together.
I modified the width of he traces to 18, Also all the vcc and gnd’ are connected, are you saying there is nothing else wrong with the schematic if those are the only issues you see?
Yeah I’m aware of pcb fabricators but I would prefer to learn from this experience so I can create my own circuit boards ON-THE-GO. Any more assistace with the ACTUAL circuit diagram would be appreciated.
If you can’t post schematic I can’t possibly say if it will work. I have reverse engineered PCB designs before but have no desire to do yours when you can supply the original.
I never built a schematic for this, I can provide you the chip diagram? All i want to do is program the chip (on board) to flash the lights however needed… the circuit i put down is what i could gather based on what i have looked around for online, The circuit should be simple ftdi i/o headers which i can connect to a (chipless uno) rx/tx/reset/gnd/3.3vcc, i don’t see how i need to draw a schematic when the diagram above should be easy for anyone to figure out within a few seconds.
Before i jump to making this circuit i thought i would ask some likeminded people to conclude that the wiring should act as required?
I have been doing this type of work for some time and always start with a schematic. I tend to think of schematics as “What I want to do” and artwork as “What I did do”. Makes it much easier to ask for review.
My preferred tools are the GNU gEDA tool set with gschema and PCB. They, like almost all others, allow a smooth transition between the two views with error checking. gEDA plays best on Linux and very poorly on Windows. Two other popular options are KiCad and Eagle. What do you use?
If this is your latest artwork please notice the thin traces between the pins on the FTDI header.
I'm not sure if this is how schamatics are done however I have modified the circuit a little. Also, KiCad has no momentary push button in the libs o.0???
Notes:
# Only one led is in this circuit, no need for the others. # Changed FTDI for ISP Header (FOR PROGRAMMING, NOT BOOTLOADING) doh!
There, i hope that helps Please advise if the circuit should act as a programable led Just so you know, this is just a test, i don’t care about the cost.
You wont need D? on the reset line. Most circuits just have the 10K pullup to Vcc and the momentry push button to ground. C1 should be a 100uf electrolythic (mind the polarity !) for a bit of extra power supply filtering. Minor suggestions…