fossasia/pslab

http://pslab.io | https://play.google.com/store/apps/details?id=io.pslab

CyReVolt

@CyReVolt:matrix.org

Hi, I tried to join the install workshop yesterday, but came a bit later, at 4:30pm, though noone was in the BBB... did I get something wrong? I signed up via eventyay and used the link there. Next week I can't make it because we're having the annual Labortage event at our hackerspace https://wiki.das-labor.org/w/Labortage_2021

Mario Behling

@mariobehling

@CyReVolt:matrix.org Such a pity! In the meeting we had decided to switch to Jitsi in order to enable everyone to share their screen. It was in the chat, but we should have also shared it here. Sorry about that. We are doing a repetition of the process next week again.

CyReVolt

@CyReVolt:matrix.org

[m]

Yea next week I can't join because it collides with Labortage.
Hope things are smooth for everyone! The easiest way will be on Arch, just yay -S pslab-desktop and it works. The Python lib is pulled in as a dependency automatically with all its requirements.

MOHIT GUPTA

@MohitGupta121

@mariobehling Codeheat is also for pslab???

MOHIT GUPTA

@MohitGupta121

Okay

Mansi Mishra

@0904-mansi

When the project idea list for GSoC 2022 will be updated?

Michael Downey 🇺🇳

@michael:downey.net

[m]

It usually happens in the first few months of the year.

Google have to make their official announcements and select orgs, etc. :)

Mansi Mishra

@0904-mansi

ok Thanks, @michael:downey.net sir :)

Michael Downey 🇺🇳

@michael:downey.net

[m]

Per Google "dates coming soon" 😁 https://developers.google.com/open-source/gsoc/timeline

5 replies

Michael Downey 🇺🇳

@michael:downey.net

[m]

@0904-mansi theres never any guarantees which orgs get selected by Google, but people can always start contributing to open source projects! and pslab have a lot of smart people in case of questions along the way.

Mansi Mishra

@0904-mansi

@michael:downey.net Sir from where I can see the Beginner-friendly projects of the Fossasia organization?

Michael Downey 🇺🇳

@michael:downey.net

[m]

@0904-mansi: Someone else here may have a better ideas, but you might want to start by browsing the projects at https://github.com/fossasia and looking to see which interest you. Most will have documentation about how to chat with the project team. For example this project Pocket Science Lab you can ask questions here. But each project will be a little bit different in how they work so you'll want to watch, ask, and learn.

Mansi Mishra

@0904-mansi

@0904-mansi: Someone else here may have a better ideas, but you might want to start by browsing the projects at https://github.com/fossasia and looking to see which interest you. Most will have documentation about how to chat with the project team. For example this project Pocket Science Lab you can ask questions here. But each project will be a little bit different in how they work so you'll want to watch, ask, and learn.

ok, sir !! Thanku so much you helped me a lot🤗🤗

Mansi Mishra

@0904-mansi

I'm trying to start the development server of this project https://github.com/fossasia/pslab-webapp. I am following the steps as given but it's not starting throwing error [mansim@mansi frontend]$ ember s environment='development'
Required packages are missing, run npm install from this directory to install them.
whereas I have run npm install 3 times again and again it is throwing this error what should I do? Please help
Thank you!!

Mario Behling

@mariobehling

@0904-mansi This repo is currently inactive as we are focusing on the hardware, Android and desktop app. Please check out the desktop app here https://github.com/fossasia/pslab-desktop

Please join us today at 8.30 IST for an installation workshop https://eventyay.com/e/873f2ec3-d433-448a-8b72-e7520694e5c0

Mansi Mishra

@0904-mansi

ok Sure @mariobehling sir

2 replies

nielek2

@nielek2

i'll be at an art opening later, so can't join today unfortunately

Mario Behling

@mariobehling

Hello @CloudyPadmal I had a talk with @RafaelLeeImg and he can help us with the hardware further. There are a number of components that are not easily available. These can be substituted with other components but this will require some changes of the hardware layout. Do you have any feedback about this? I think he could make PRs in the harware repo for any changes, right?

Padmal

@CloudyPadmal

Sounds great. I think we can go ahead with that! :+1:

CyReVolt

@CyReVolt:matrix.org

[m]

This could be interesting for PSLab as well:
https://twitter.com/beriberikix/status/1465041736468611072?t=gA7HwYMINXofCj2kVtqrPA&s=19

(porting libusb to WASM)

Mario Behling

@mariobehling

Dear @/all Please join our weekly open hardware call on Saturday at 17:00 CET / 21:30 IST. Please register at https://eventyay.com/e/1873937b

In this meeting we discuss the progress and next steps of the new Pocket Science Lab version (https://pslab.io), development, firmware, Android app and production questions. If you would like to share updates on other projects you are working on, you are welcome too!

After registering you can click the "Join event" button on the event page and then click on the video room link on the left to participate in the meeting.

RafaelLeeImg

@RafaelLeeImg

I found a power bank charging management chip, supports 1.5A charging and 2A, 5V boost output, IP5206 or IP5305. The price is arount ￥1 RMB. It can replace LTC4040. The LTC4040 is around $5 USD in China. What do you think? The datasheet is in Chinese. I think the chip is widely sold in power bank around the world but it's only used in Chinese made power banks.
Any comments?

Mario Behling

@mariobehling

@RafaelLeeImg Nice. Do you have a link to the component/manufacturer?

RafaelLeeImg

@RafaelLeeImg

Here's the site of the IC manufacturer.
http://www.injoinic.com/product_detail/id/21.html

It just suddenly came to my mind that we can use power bank IC.

Mario Behling

@mariobehling

:thumbsup:

RafaelLeeImg

@RafaelLeeImg

Hi. The USB-to-Serial chip CP2102 I can find, but the price is a little high around $1.7 USD. However I found that PL2303GL is available, the price is half of it. The speed limit is 115200, is the speed enough?

Padmal

@CloudyPadmal

We're running at 1,000,000 baud rate. 115,200 is a bit slow..

RafaelLeeImg

@RafaelLeeImg

OK. Is there any other specific requirement for the USB-UART converter?

Padmal

@CloudyPadmal

Data rate is the key point. Other than that, it's the component count. CP210x doesn't require any crystals etc.

Story of Arduino.. https://blog.arduino.cc/2021/12/09/one-board-to-rule-them-all-history-of-the-arduino-uno/

RafaelLeeImg

@RafaelLeeImg

CP2102 QFN24 is out of stock. I bought 1000 pcs of CP2102 with QFN20.

RafaelLeeImg

@RafaelLeeImg

I sent the modified PSlab v6 to manufacturer. I changed nearly all power ICs to make the design able to manufacture.
Now the only blocking things are MCP4728 and MCP6S21 are not found.

Mario Behling

@mariobehling

@RafaelLeeImg Thanks! Curious to learn how it is working. We have a quote of another supplier in China as follows:
MCP4728: RMB 86.000
MCP6S21: RMB 10.800
What do you think about this?

RafaelLeeImg

@RafaelLeeImg

MCP6S21: RMB 10.800 is OK. MCP4728 is too expensive, think about this, we can use even several stm32s to replace this DAC, there is no reason to use that.

Mario Behling

@mariobehling

What price for MCP4728 is within an acceptable range?

RafaelLeeImg

@RafaelLeeImg

I suggest spend no more than 20 on this chip, idealy, no more than 10. Since it's only a 4 channel DAC with with the speed of below 200k samples per second. That's a very ordinary DAC. There is no need to spend much money on it.

Mario Behling

@mariobehling

Correct. In one of the previous orders MCP4728 was 6.00 RMB and now they quote 86 RMB. I wonder if they meant 8.60 RMB.

@RafaelLeeImg I am looking forward to your tests to see if any other components need to be changed.

RafaelLeeImg

@RafaelLeeImg

I already have too many ICs at home. Haha, really a lot.

Mario Behling

@mariobehling

:thumbsup:

Mario Behling

@mariobehling

@CyReVolt:matrix.org @bessman Here is the submission for an online talk on 27th Dec that we discussed today https://pretalx.c3voc.de/rc3-2021-xhain/talk/3BFKMQ/

apoorva-raj

@apoorva-raj

Hey, I'd like to contribute on this project for codeheat. Do I have to buy the hardware to do so?

CyReVolt

@CyReVolt:matrix.org

[m]

News on the rC3 world @mariobehling
https://events.ccc.de/2021/12/20/rc3-was-wie-wo/

Alexander Bessman

@bessman

@mariobehling Do we need to sign up somewhere before the panel discussion? What technology will be used for the call? Eventyay?

1 reply

CyReVolt

@CyReVolt:matrix.org

[m]

https://twitter.com/vthakkar_/status/1102228437140414465?t=f574UuaBASTlPFSWqeORYg&s=19
this is a nice cheat sheet for sending patches via email 📧 👩‍💻

RafaelLeeImg

@RafaelLeeImg

MCP6S21 is hard to find, I may use CAT5171 or MCP4017 to build variable gain amp.
I need to find another I2C DAC to replace MCP4728, too.

RafaelLeeImg

@RafaelLeeImg

Good news: The basic test of the replaced power chips all function normally, including the charging, discharging, power supply with/without the battery. 10V boost circuit, -10V capacitor pump, +6V and -6V voltage source.
I add a button to control the IP5189T power bank IC. Press the button to turn it on, press 2 times to turn it off. The power bank IC will measure the current, if the current is less than 45mA, it will cut-off the output after 40 seconds.

I've replace the MCP6S21 with a MAX5400 digital potentiometer and a TL082 general operational amplifier.
I've replace the 4 channel DAC MCP4728 with 2 two channel DAC MCP4822, if there is no strong synchronization between different DAC channels. I think it's OK because the 4 amplifing circuits after DAC are pretty different, so there may be no requirement for synchronization between DAC channels.
I've add a 74HC4051 to handle the Chip-Select pins which are newly added.

Bad news: I only bought 2 pieces of IP5189 for testing, I checked there are more than 3000 pieces when I chose to test it, but now there are none left. I may need to test IP5219 instead or wait for a while.

The datasheets are here http://www.injoinic.com/product_detail/id/21.html

I need PIC24 chips and a debugger if there are some to further test with modifying the firmware.

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