| 23 Jul 2021 |
 kelu | I had played with the https://www.adafruit.com/product/3056 | 17:41:04 |
 brycedrechselsmith | oh, ive actually used those before as well, but not for anything like this | 17:42:15 |
| kelu | See : https://github.com/kelu124/echomods/tree/master/retired/croaker | 17:43:11 |
| kelu | " In a nutshell: getting roughly 12bits, 2Msps+ ADC acquisition and Wifi-streaming, on a powerbank. Read more here for the details on the STM32 work. Arduino code here, with details for setup. " | 17:43:24 |
| kelu | Not continuous though | 17:43:54 |
| brycedrechselsmith | ah, what sort of interval? | 17:44:22 |
| kelu | I think 250us then sending, continuously | 17:45:52 |
| kelu | STM32F303 seems to have 5Msps ADC 😃 | 17:46:38 |
| kelu | to be honest, it'll be tricky | 17:46:58 |
| brycedrechselsmith | lordy dont i know it | 17:47:13 |
| kelu | ^^ | 17:47:22 |
| kelu | btw, if you signal is modulated, why don't you put the demodulation in hardware and slow ADC + wifi ? | 17:47:29 |
| brycedrechselsmith | i was able to get continuous capture on an rpi0w with an ads7884 using dma, and streaming the data into a csv file | 17:47:57 |
| kelu | Alternatively, i'd go for an wire connection 😃 | 17:48:01 |
| kelu | using a rpi0w isn't really a microcontroller but sounds good yup. | 17:48:24 |
| brycedrechselsmith | but continuous streaming was just not happeneing, couldnt set up a proper ping pong buffer, and i think the problem there was the way rpi works | 17:48:30 |
| kelu | if you have issues with how the RPi works, then using a microcontroler is .. courageous 😃 | 17:49:02 |
| brycedrechselsmith | hahaha | 17:49:33 |
| kelu | hum I have seen some hardware buffers | 17:49:41 |
| brycedrechselsmith | ~brave~ stupid and desperate | 17:49:54 |
| kelu | there are some chips that can act as FIFOs, so that could be a solution | 17:50:08 |
| kelu | you connect the FIFO buffer between the RPi and ADC, and you get the RPi to read the FIFO by burst when not shipping through wifi | 17:50:30 |
| brycedrechselsmith | thats a good idea, its essentially what I was trying to do with the ping pong buffer, i hadn't thought to put physical hardware in that position | 17:52:04 |
| kelu | hardware is nice 😉 | 17:52:18 |
| brycedrechselsmith | in answer to your earlier question about hardware for demod, I suggested that but was shot down... | 17:53:18 |
| kelu | to be honest I'd go for a small, cheap FPGA (like the up5k i use and like) that would go between the ADC and the buffer, then buffer to RPi. | 17:54:00 |
| kelu | trick is then when the RPi isn't sending to "size" the bandwidth required to read from the buffer | 17:55:41 |
| brycedrechselsmith | interesting, I really appreciate your help! | 17:58:42 |
| brycedrechselsmith | you've given me quite a bit to research | 17:59:11 |
| brycedrechselsmith | thanks | 17:59:29 |
