!mtSnuCHbcPbERguOKO:matrix.org

usdevkit

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Chat room for [ultrasound imaging dev kit](https://hackaday.io/project/10899-a-hsdk-for-ultrasound-imaging).30 Servers

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10 Sep 2020
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu By the way, just to confirm, the flash remains between poweroffs, so you can flash it once and never flash it after. 11:26:39
@_slack_usdevkit_U01AEE7N8BV:matrix.orgb.osullivan just usb connection 11:58:36
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu That's weird. Seems like a Linux issue - what do the logs say? 12:04:14
@_slack_usdevkit_U01AEE7N8BV:matrix.orgb.osullivan I am new to rasp pi and unsure how to interpret the logs, I am now looking into it. If the usb to un0rick connection was previously connected and failed, will this show up in the dmesg logs, or does it currently have to be connected to show up 12:53:02
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Thanks, it seems the board is pulling too much current while still not browning out the pi. Would you have a pic of the board? I would tend to believe there's a short somewhere there. 14:32:19
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Please do also try with another usb cable just to rule out it's not the cable 14:32:43
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Another thought: the rpi4 does use a significant current, are you sure you have a big enough supply ? 21:35:15
11 Sep 2020
@_slack_usdevkit_U01AEE7N8BV:matrix.orgb.osullivan Hi yes I am using the raspberry pi 4 usb c power supply from their website. I tried multiple usb cables with same result. 09:45:53
@_slack_usdevkit_U01AEE7N8BV:matrix.orgb.osullivan Here is the RPi picture 09:47:53
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu I mean, a picture of the un0rick board 10:01:46
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu maybe a jumper is set wrong and could cause a short ? 10:02:03
12 Sep 2020
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Hum I've tried and reproduce the bug, but it seems, that with keyboard and mouse plugged in, I can still flash the board and not glitch the RPi. Weird. 11:10:19
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Not often that it happens but.. @room, we need you 😃 Managed to get some rad images from a RPi Zero ( https://github.com/kelu124/echomods/tree/master/matty/20200608a ) but the same script fails on a Raspberry Pi 4. No idea why. Guessing some changes in spidev? In any case, a bit unclear. Soooo, in your view, from the python contro lib in question ( https://raw.githubusercontent.com/kelu124/echomods/master/matty/20200608a/pyUn0.py ), what's the bug ? 11:13:31
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Thinking of something to do with spidev? Don't know 😞 11:19:12
15 Sep 2020
@_slack_usdevkit_U01AEE7N8BV:matrix.orgb.osullivan Hello, I did not do any soldering on the Un0rick board but I will send some pictures 07:43:37
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu If you have a pi w with you, may be worth checking it too. 16:55:07
16 Sep 2020
@_slack_usdevkit_U01AEE7N8BV:matrix.orgb.osullivan I checked with a second rasp pi 4 and still getting the same issue, must be an issue with the board 11:28:52
17 Sep 2020
@erbse:synod.im@erbse:synod.im left the room.00:29:17
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Hum weird. If I remember well this was a board I sent to you soldered, so normally tested. Anyhow. Just a last test, can you try with a different power supply? The Pi4 may be drawing quite a bit of current, just want to make sure we'e not borderline on the energy enveloppe. 10:47:31
@_slack_usdevkit_U01AEE7N8BV:matrix.orgb.osullivan I will test this tomorrow, I need to get another power supply 13:00:39
19 Sep 2020
@_slack_usdevkit_U019BD4E8LX:matrix.orgcarlos.santiago.diaz Just got the NMTx module, they're tiny! I think I will go for the unipolar signal for the pvdf transmitter. 16:15:10
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Yeah! 17:36:33
@_slack_usdevkit_U019BD4E8LX:matrix.orgcarlos.santiago.diaz How fast are you switching the Mosfet on un0rick? The mosfet that drivers the piezo element. 18:20:03
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Hum that's settable - you can control the pulse width through the ice40, with a resolution of 1/128us 18:25:00
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu That's a single pulse though, but you can program it to repeat of course 18:25:20
@_slack_usdevkit_U6E49CNV6:matrix.orgmhough Another interesting paper https://www.nature.com/articles/s41586-020-2685-y 21:42:36
20 Sep 2020
@_slack_usdevkit_U019BD4E8LX:matrix.orgcarlos.santiago.diaz Cool, I will try to find that. I'm currently working on my prototype and I'm generating a 1mhz signal. 00:01:26
21 Sep 2020
@_slack_usdevkit_U5M5PLH9S:matrix.orgkelu Exciting. Better resolution, sensitivity - plenty of things to do with that ! 06:57:05
26 Sep 2020
@dagmar:hive-mind.networkdagmar 07:44:35
@joaquin:matrix.valenciawireless.orgjoaquin joined the room.08:47:51

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