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by markost
Tue Jun 04, 2019 7:36 pm
Forum: Automation, sensing and robotics
Topic: Pi in the Car - Accessory Power Monitoring
Replies: 11
Views: 738

Re: Pi in the Car - Accessory Power Monitoring

Relay switching time is too long for sensitive electronics like Pi.
Look at https://www.tindie.com/products/picotou ... w-version/, special designed for car.
by markost
Wed May 08, 2019 6:47 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Shutting down and STAYING shut down
Replies: 10
Views: 920

Re: Shutting down and STAYING shut down

Try something like this for your solution (not a real code) void loop() int state=1 if (state==1) { digitalWrite(GPIO_X, HIGH); // bypass start push button&arduino power supply and start raspberry delay xx seconds/minutes (raspberry full boot time) state=0 } if (digitalRead(GPIO_Z) == LOW) // stop p...
by markost
Tue May 07, 2019 2:04 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Shutting down and STAYING shut down
Replies: 10
Views: 920

Re: Shutting down and STAYING shut down

I'm sorry, but I can not explain it easier. You can look at the logic described at https://www.tindie.com/products/picotouch/raspberry-pi-automatic-onoff-v21-new-version/, where it is described in detail how my circuit works. Pay attention to the explanation of POWER ON (especially the last sentence...
by markost
Mon May 06, 2019 5:11 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Shutting down and STAYING shut down
Replies: 10
Views: 920

Re: Shutting down and STAYING shut down

Similarities in the design are: using a microcontroller to control the process, using delays, using GPIO for start up and as sense for shutdwon on Raspberry Pi side ... There are two buttons in your set up (start&stop) For me it is ACC, for both of them. My design is designed to automate the startup...
by markost
Sun May 05, 2019 5:59 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Shutting down and STAYING shut down
Replies: 10
Views: 920

Re: Shutting down and STAYING shut down

...atmega's GPIO is being used to keep this "relay" is the "continue to power the board" state. The pi begins booting... I think that's a problem here. Obviously GPIO resets Raspberry Pi. Especially when using a voltage regulator that is still faster than the classic relay. I use a similar logic fo...
by markost
Wed Sep 19, 2018 11:47 am
Forum: Troubleshooting
Topic: Problem for undervoltage
Replies: 19
Views: 2219

Re: Problem for undervoltage

@Joel_Mckay Thanks for your point of view. I agree for the 5V power rail (all marked as 5V on schematic are on the same rail), but I don't agree that the 5V on the GPIO (pin 2 and pin 4) are not after polyfuse. I don't have RPi3B+, only 3B. If 5V on the GPIO doesn't go through the polyfuse than must...
by markost
Wed Sep 19, 2018 10:15 am
Forum: Troubleshooting
Topic: Problem for undervoltage
Replies: 19
Views: 2219

Re: Problem for undervoltage

OK,

can you show me on schematic where is the 5V input for the GPIO header (from where this voltage is coming)?
Obviously I'm looking at something wrong

Thank you!
by markost
Wed Sep 19, 2018 9:55 am
Forum: Troubleshooting
Topic: Problem for undervoltage
Replies: 19
Views: 2219

Re: Problem for undervoltage

How can I solve this problem? How about doing this: 1. Power the Raspberry Pi with its own 5v 2.5A PSU with thick microSUB cable. 2. Power the Arduino with its own PSU (5V 2A perhaps) 3. Connect the USB deviced thru a powered Hub.. Its still up to you to apply the solution....... or continue wonder...
by markost
Wed Sep 19, 2018 9:50 am
Forum: Troubleshooting
Topic: Problem for undervoltage
Replies: 19
Views: 2219

Re: Problem for undervoltage

@markost That is the usb port input, not the 5v/VCC gpio header pin 2 and 4. The 3B+ looks like it has kept this external shield power feature. the power supply comes via the microUSB, it goes over the polyfuse. Here we have "first" 5v, which is the same as the GPIO expansion pin 2 and 4. So, does ...
by markost
Wed Sep 19, 2018 9:10 am
Forum: Troubleshooting
Topic: Problem for undervoltage
Replies: 19
Views: 2219

Re: Problem for undervoltage

try to use the power supply arduino separately and not through the usb port
by markost
Wed Sep 19, 2018 9:07 am
Forum: Troubleshooting
Topic: Problem for undervoltage
Replies: 19
Views: 2219

Re: Problem for undervoltage

Let us assume you already enabled max_usb_current=1 ... This site is wrong for 3 reasons:. https://www.raspberrypi.org/help/faqs/#powerReqs 1. The 5v header pins do not pass through the poly fuse. 2. While 1.2A for the USB port is fine, that optimistic minimum 400mA core draw should be more like 1....
by markost
Mon Sep 17, 2018 5:58 am
Forum: General discussion
Topic: Using your Pi with an SSD (Solid State Drive)
Replies: 46
Views: 53913

Re: Using your Pi with an SSD (Solid State Drive)

Hi, here are some information about the KingDian SSD (S100 +, 16GB, 1.8 ", SATA2) and SATA to USB (22 Pin SATA to USB 3.0), tested on Raspberry Pi 3B. Set RPI with program_usb_boot_mode = 1. Test 1: RPi is powered by a Xiaomi smartphone charger (originally), declared as 5V / 2A. NO to boot from the ...

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