I'm going to tinker with different soundcards I have, USB and PCI to see which is better at storing and playing audio from old vinyl records that I have.
What do/don't you have planned?
I'm going to tinker with different soundcards I have, USB and PCI to see which is better at storing and playing audio from old vinyl records that I have.
What do/don't you have planned?
I want to use multicoloured LEDs as indicators on an instrument front panel and It will need 32 of them. I thought I might use the 2mm square neopixels and I bought 1000 from Aliexpress for about 1.6p (£0.016) each.
I thought I had better see how well they worked.
I'm driving them from the SPI MOSI pin on an ARM processor (Giga Devices GD32E103 and I had to tweak the clock to get a good ratio of high and low times from 4 bits of a 16 bit SPI data word.
Right now the code is using interrupts (one for every 16 bit word transmitted) but I'll change it to use DMA.
Happy to post the code if any one wants to play with it. The GD processor SPI is a pretty much exact clone of earlier ST ST3210x processors.
I set up a pseudo random thing to drive it (sorry about the kitchen paper optical filter - the camera couldn't cope with bright LEDs).
So I'm pleased to say that the sub 2p neopixels work OK.
Unfortunately the little light pipes (plastic rods a few mm long with a domed end) cost about 5x as much as the pixels - but I need them to get the light through the front panel.
MK
I want to use multicoloured LEDs as indicators on an instrument front panel and It will need 32 of them. I thought I might use the 2mm square neopixels and I bought 1000 from Aliexpress for about 1.6p (£0.016) each.
I thought I had better see how well they worked.
I'm driving them from the SPI MOSI pin on an ARM processor (Giga Devices GD32E103 and I had to tweak the clock to get a good ratio of high and low times from 4 bits of a 16 bit SPI data word.
Right now the code is using interrupts (one for every 16 bit word transmitted) but I'll change it to use DMA.
Happy to post the code if any one wants to play with it. The GD processor SPI is a pretty much exact clone of earlier ST ST3210x processors.
I set up a pseudo random thing to drive it (sorry about the kitchen paper optical filter - the camera couldn't cope with bright LEDs).
So I'm pleased to say that the sub 2p neopixels work OK.
Unfortunately the little light pipes (plastic rods a few mm long with a domed end) cost about 5x as much as the pixels - but I need them to get the light through the front panel.
MK
