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by msl
Thu Jan 14, 2021 4:24 pm
Forum: Compute Module
Topic: CM4 PCB Design and Manufacturing
Replies: 36
Views: 2117

Re: CM4 PCB Design and Manufacturing

I've just had to quit using JLCPCB as they're simply not bothering to restock items on their Extended parts list so I have three designs ready to go and no way of getting them loaded. They even had the cheek to suggest I solder the missing parts myself. A company going downhill fast ! There are rum...
by msl
Tue Jan 12, 2021 7:18 pm
Forum: Compute Module
Topic: Access CM4 via micro USB port (g_ether module) and connect Wi-Fi adapter to USB 2.0 port at the same time
Replies: 20
Views: 534

Re: Access CM4 via micro USB port (g_ether module) and connect Wi-Fi adapter to USB 2.0 port at the same time

Fair enough but is that a fair comparision? Is pushing 1.2A into a battery in the elapsed time of an hour a guarantee of a well regulated 1.2A @ 5v supply? Especially if both Apple devices are using USB PD (the Pi doesn't). I'm quite happy to be proved wrong, but given the recommended PSU for the 4...
by msl
Tue Jan 12, 2021 12:18 pm
Forum: Compute Module
Topic: Access CM4 via micro USB port (g_ether module) and connect Wi-Fi adapter to USB 2.0 port at the same time
Replies: 20
Views: 534

Re: Access CM4 via micro USB port (g_ether module) and connect Wi-Fi adapter to USB 2.0 port at the same time

Have you tested this? I've no idea if an iPad supports g_ether (it'll appear to the iPad as an RNDIS or CDC ethernet dongle). There is an article on this https://magpi.raspberrypi.org/articles/connect-raspberry-pi-4-to-ipad-pro-with-a-usb-c-cable So there is. I've still got doubts about power thoug...
by msl
Tue Jan 12, 2021 11:41 am
Forum: Compute Module
Topic: Access CM4 via micro USB port (g_ether module) and connect Wi-Fi adapter to USB 2.0 port at the same time
Replies: 20
Views: 534

Re: Access CM4 via micro USB port (g_ether module) and connect Wi-Fi adapter to USB 2.0 port at the same time

thagrol wrote:
Tue Jan 12, 2021 11:34 am
Have you tested this?
I've no idea if an iPad supports g_ether (it'll appear to the iPad as an RNDIS or CDC ethernet dongle).
There is an article on this
https://magpi.raspberrypi.org/articles/ ... sb-c-cable
by msl
Sun Jan 10, 2021 12:35 am
Forum: Compute Module
Topic: Can Someone recommend a designer to make cm4io changesthat can so
Replies: 3
Views: 293

Re: Can Someone recommend a designer to make cm4io changesthat can so

All; Can someone recommend an organization that can create a circuit board in Kicad if a schematic is provided in Kicad? I am not that experienced yet in Kicad board layout. Thanks; idea-thinker There was video from Digi-Key recently that covers most of PCB layout aspects: https://youtu.be/ge6gYIEN...
by msl
Fri Jan 08, 2021 8:35 am
Forum: Compute Module
Topic: CM4 Hirose connectors are not parallel
Replies: 9
Views: 483

Re: CM4 Hirose connectors are not parallel

dp11 wrote:
Thu Dec 24, 2020 1:08 pm
With the seasonal break I can't check the logs. Is this an early prototype board that we sent or purchased via a reseller ? Production boards have a much more advanced test and inspection procedure.
msl wrote:
Thu Dec 24, 2020 1:26 pm
It’s purchased via officially listed distributor in Germany.
Any updates?
by msl
Thu Jan 07, 2021 8:46 pm
Forum: Compute Module
Topic: CM4 I²C0 and I²C1 connections
Replies: 25
Views: 967

Re: CM4 I²C0 and I²C1 connections

Brilliant, I wasn't sure it was a proper I2C bus. Next question: Can I put 2 official displays on Disp0 and Disp1, and/or 2 identical cameras on Cam0 and Cam1 using the same I2C bus? In other words, is there a means of setting different addresses on these identical devices? Take a look at CM4 CMIO ...
by msl
Thu Jan 07, 2021 6:08 pm
Forum: Compute Module
Topic: CM4 I²C0 and I²C1 connections
Replies: 25
Views: 967

Re: CM4 I²C0 and I²C1 connections

Hi, I have not posted before, so if I am butting into the wrong discussion, I apologise. I am designing a motherboard like the CM4 IO board and looking at the SDA0 and SCL0 going into both a camera connector and a display connector on the CM4IO schematic. If a camera and display were fitted simulta...
by msl
Wed Jan 06, 2021 2:21 pm
Forum: Compute Module
Topic: compute module 3
Replies: 3
Views: 232

Re: compute module 3

HI, Iam working on raspberry pi compute module we have designed our custom i/o board. when i insert the cm3 in our custom board, the rpi is not booting. we found we missed 1.8 v supply in our schematic we added later,but still it is not booted. schematic: https://1drv.ms/b/s!AvAuLbPBCqSaeTyyl3alV6y...
by msl
Wed Jan 06, 2021 1:51 pm
Forum: Compute Module
Topic: USB with CM3 powered by only 3v3 and 1v8
Replies: 2
Views: 199

Re: USB with CM3 powered by only 3v3 and 1v8

Hello All, If the CM3 is powered by only 3V3 and 1V8 (i.e. VBAT connected to 3V3 and not 5V) do we expect the USB bus to work? I can't see anything in the docs suggesting that it wouldn't but I have seen it mentioned in a forum post. I have a test board where the only power is 3V3 and 1V8 and the U...
by msl
Thu Dec 31, 2020 9:42 am
Forum: Compute Module
Topic: [SOLVED] DSI Panel JDI LT070ME05000 bringup issues
Replies: 30
Views: 4532

Re: [SOLVED] DSI Panel JDI LT070ME05000 bringup issues

If the viewing angle is really good and the brightness is well enough then I am going to use this LCD for a double DIN car stereo project. Can I ask you to take a video of the screen at really wide angles (all 4 sides)? Also at high brightness, to check if it is usable in car. This LCD screen is us...
by msl
Wed Dec 30, 2020 12:38 am
Forum: Compute Module
Topic: CM4 - Converting HDMI1 to 3.5mm Audio Jack (Audio only)
Replies: 4
Views: 304

Re: CM4 - Converting HDMI1 to 3.5mm Audio Jack (Audio only)

Thanks for the reply, The reason why I dont want to sue the PWM pins for audio is they might be not loud enough compared with USB-audio. (I have not experimented, it just a guess). I2S solution sounds so tempting :) , I will look at it as an alternative solution. so I think I would go for USB-audio...
by msl
Sat Dec 26, 2020 11:13 pm
Forum: Compute Module
Topic: CM4 - Converting HDMI1 to 3.5mm Audio Jack (Audio only)
Replies: 4
Views: 304

Re: CM4 - Converting HDMI1 to 3.5mm Audio Jack (Audio only)

1. Take a look at Raspberry Pi 4 schematics for PWM to audio jack schematics. 2. Another option is to use audio CODEC on i2s. Good point to start here is to look at device tree overlays list and see if any of those ICs would work for you. For particular ICs look at TI website 3. Don’t forget USB aud...
by msl
Thu Dec 24, 2020 1:26 pm
Forum: Compute Module
Topic: CM4 Hirose connectors are not parallel
Replies: 9
Views: 483

Re: CM4 Hirose connectors are not parallel

It’s purchased via officially listed distributor in Germany.

Fun thing is that I didn’t notice that on own carrier, since was using this CM as soldering jig to fix connector edges on PCB
by msl
Thu Dec 24, 2020 12:54 pm
Forum: Compute Module
Topic: CM4 Hirose connectors are not parallel
Replies: 9
Views: 483

Re: CM4 Hirose connectors are not parallel

29426A45-1CD7-4FEA-9F4C-84DF21BDD7B9.jpeg
29426A45-1CD7-4FEA-9F4C-84DF21BDD7B9.jpeg (57.31 KiB) Viewed 468 times
Hope it’s readable

Forgot to mention, CM4 itself boots normally
by msl
Thu Dec 24, 2020 12:41 pm
Forum: Compute Module
Topic: CM4 Hirose connectors are not parallel
Replies: 9
Views: 483

CM4 Hirose connectors are not parallel

One of my CM4 modules requires some efforts to snap it to CMIO board. Then I noticed that Hirose connectors are not parallel on CM4 and distance between connectors measured on opposite sides of connectors differs by 0.25mm.
Is it something within margins or manufacturing fault?
by msl
Mon Dec 21, 2020 6:18 pm
Forum: Compute Module
Topic: CM4 based compact avionics display
Replies: 15
Views: 621

Re: CM4 based compact avionics display

- There are special USB connectors without USB3 pins, thus they have only one row of pins and can be hand soldered Interesting. Any part number reference? I picked the most "mainstream" looking USB-C connector because last time I tried something more "boutique", PCBWay.com said ...
by msl
Mon Dec 21, 2020 12:25 pm
Forum: Compute Module
Topic: CM4 based compact avionics display
Replies: 15
Views: 621

Re: CM4 based compact avionics display

Greetings! In the hope that this of general interest, I'd like to share my design for a CM4 based Open Source avionics display. This work is all Creative Commons licensed, and so available to anyone who would like to use it. This design has not been manufactured , so please do not rely on it yet; I...
by msl
Sat Dec 19, 2020 7:26 pm
Forum: Compute Module
Topic: Touch screen, how to turn this on in Android in environment
Replies: 4
Views: 179

Re: Touch screen, how to turn this on in Android in environment

Thanks alot for the answer, an you are correct, there also was an touch usb connector "not connected :shock: " i have both power, touch connected now, is that correct, cause the screen works also "no touch still" only on the touch usb cabel ? Still it does not work in my lineage...
by msl
Sat Dec 19, 2020 2:42 pm
Forum: Compute Module
Topic: Touch screen, how to turn this on in Android in environment
Replies: 4
Views: 179

Re: Touch screen, how to turn this on in Android in environment

Hi guys. Im pretty new to this Rasberry pi stuff, sorry about that first of all. I bought an rasberry pi 3 b+ an a touch screen, im running android 9.0 (playstore incl.) with some app´s i would like the screen to be setup fixed in my dinner room, so i can turn lights phillips hue, irobot, youtube f...
by msl
Thu Dec 17, 2020 2:55 pm
Forum: Compute Module
Topic: I have a question about raspberry pi cm3+ lite.
Replies: 2
Views: 145

Re: I have a question about raspberry pi cm3+ lite.

Hello I want to use raspberry pi cm3+lite module. So we ordered development kit together. But I don't know how to run the raspberry pi cm3+lite module. First, I installed raspbian on the sd card. I searched on the Internet and found that only the cm3 module with emmc was explained, so I asked this ...
by msl
Wed Dec 16, 2020 8:15 pm
Forum: Compute Module
Topic: Any plans to restock RPI CMDK ADAPTER?
Replies: 1
Views: 95

Any plans to restock RPI CMDK ADAPTER?

RPI CMDK ADAPTER, board to interface 15 pin camera and display to 22 pin CMIO, used to be available at Farnell as well as other online stores. While camera adapter can be purchased as flex cable, there seem to be no replacement for display adapter. With CM4 CMIO release, any plans to restock those?
by msl
Tue Dec 15, 2020 5:49 pm
Forum: Compute Module
Topic: Where to buy CM4 in EU
Replies: 5
Views: 256

Re: Where to buy CM4 in EU

No WiFi version is available in Germany, as well as CMIOs and I use it with USB-WiFi adapter while waiting for wireless version.

EDIT:
List of local resellers available at the bottom of product page: https://www.raspberrypi.org/products/compute-module-4
by msl
Mon Dec 14, 2020 9:37 pm
Forum: Compute Module
Topic: best compute module for Google Coral edge TPU accelerator
Replies: 10
Views: 382

Re: best compute module for Google Coral edge TPU accelerator

I wanted to know which is the best best compute module to use Google Coral edge TPU accelerator ? I was looking at the CM4108000 Lite 8Gb RAM with wireless. Is eMMC necessary for such application or I can just use the SD/NVMe for OS/storage? Any suggestions? thx eMMC is two times faster than SD, be...
by msl
Mon Dec 14, 2020 9:32 pm
Forum: Compute Module
Topic: CM4 USE Raspberry Pi Touch Display
Replies: 13
Views: 903

Re: CM4 USE Raspberry Pi Touch Display

I sometimes wonder why we bother writing documentation as no one ever appears to read it. https://www.raspberrypi.org/documentation/hardware/computemodule/cmio-display.md section "Quickstart — display and camera(s)" At the bottom of the page Sources: - dt-blob-disp1-only.dts - dt-blob-dis...

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