Raspberry Pi Forums

John Public

I'd like to buy two RasberryPi 3+ (europe). Most place have it out of stock.

John Public

I am trying to test HC-12 on a Raspberry Zero. I am following the example at http://dev.drun.net/2017/05/10/reading-hc-12-from-rpi-and-sending-to-domoticz/ I've connected wires as in the picture there and then test if /dev/ttyS0 is available. It is not. I tested both 3.3V and 5V pins on RPi Zero. I ...

John Public

Thanks for the reply. I managed to get the setting back to normal this way:
- I hard-shutdown rpi (pulled the power cord)
- took the SD card to another Windows computer and edited the config.txt to a better value.
It started OK with no data loss, Whew!

John Public

I have a Samsung LE23R86BC which according to specs can handle 1368x768 So I edited /boot/config.txt to have hdmi_group=2 hdmi_mode=39 Now when I boot RPi my monitor says "Mode not supported" and a blank screen. However, the lights blinking on RPi indicate that it has booted. Is there a ke...

John Public

I went ahead and tried with my setup (the one without a transistor). It worked OK - no problems. Most of the time it is turning using the relay ON a 12v connected to a electric strike door lock. When a suitable code is entered it turns the relay off for a few seconds.

John Public

Would this be OK? Connect RPi0 5v to the relay unit or should I connect 3.3V to VCC instead?
I don't want my zero to fry. The 4V7 is a Zener 4.7V

John Public

I have gotten info on how to use a 5v Relay module with raspberry Pi from https://www.raspberrypi.org/forums/viewtopic.php?t=197339 It says that I should use transistor 2n2222 and a resistor r470 as follows. Image4.jpg Unfortunately I don't have 2n2222 but instead have only BC546B. I am using the se...

John Public

OK! Answering myself. It appears that rasbian servers were down or unavailable since after some waiting all upgrades and downloads succeeded.

John Public

I've got the problem solved. The new RPI does not seem to support previous linux distros. The new "stretch" distro is recognised. I was able to to install it. But another problem rises: I installed the Raspbian Stretch Lite and proceeded to install a Gui to it as described on: https://die-...

John Public

I bought two new Raspberry Pi 3 model B+ from Pimoroni last week. I formatted a new SD card and turned power on. The red light blinks but the green light not. The HDMI shows only a color palette on the monitor (and one "lightning" sign). No boot up sequence ever comes up. The same thing ha...

John Public

I am a bit confused. Dropping all pinMode(nnn,i) -functions appeared to fix everything. What is the point of having them if it is more consistent to just read and write and forget about modes? Is there some caveats? Is there a way to check whether a pin is "read"-mode or "write"-...

John Public

My i5 is set to the physical pin 40 (GPIO29 or WiringPi pin #29). I have Raspberry Zero and I'd like to set it to high. I have nothing connected to the pin. For some reason the following code odes not work as I'd expect: printf("set to%d HIGH\n",i5); pinMode(i5,OUTPUT); digitalWrite(i5,HIG...

John Public

I could not find info about using WiringPi in commercial projects. If I create a new executable from my C source files but have WiringPi functions in it what needs to be done permission-wise? I see a lot of projects with wiring pi functions included.

John Public

I need a hard reset when system has locked up and needs a power down & power up.
With that in mind what wires from Arduino shoul go to the run pins?

John Public

Assuming that I have set the voltage to 3.3v in the Arduino what should I connect to the two "run" pins on the Raspberry. The "run" connection are rectangel and round -versions?

John Public

I've Arduino Pro Mini (5V) version. I'd like to use one of the available pin of Arduino to hard reset Raspberry.
What would be most conevenient way to do it from Arduino? I have a bunch of resistors and leds I could use.

John Public

The camera that I bough from Aliexpress has its lens screwed on. I removed it and as far as I can see the lens does not have a filter. The lens part is clear and hollow. The flat sensor does not have a filter. I just see the minuscule sensor element and if it had a filter it would have to be glued o...

John Public

The camera module I have is same as this: https://www.aliexpress.com/item/Pi-camera-module-Raspberry-Pi-2-model-B-B-Plus-lens-Focal-length-5-million-pixel/32421623838.html?ws_ab_test=searchweb0_0,searchweb201602_4_10152_10065_10151_10068_5380020_10171_10326_10084_10083_10080_10304_10307_10082_10081_...

John Public

Is there a way to Turn night-time camera (noir-camera) camera to daylight camera. Is there same raspistill option or other setup setting I could get is to work like a daylight camera? I've taken off the ir-lamps.

John Public

Have you checked the "Camera board"? There's a lot of info on your subject, for example: viewtopic.php?f=43&t=63276

John Public

Arduino has visual datalogger called "Serial plotter" which is simple to use. Is there any similar and easy to use for Raspberry /Linux.

John Public

With a simple 2K resistor in the between like this:

Rpi3 (sender) GPIO (physical pin 32) -------->2K------>Rpi3 (receiver) GPIO (physical pin 32)

Just to bring down the voltage? Can you explain how that help (I'm a noob)

John Public

I am connecting from GPIO12 from one RPi3 (sender) to another RPi3's GPIO12 (receiver). Then I'm sending data by setting (bitbanging) the sender's GPIO high or low. So the sender has GPIO 12 as "output" and the rerceiver as "input". I've got just a straight wire and everything wo...

John Public

After inspection with powerfull magnifiers it appears that a black "thingy" next to where the microusb is connected appears burn out. So I powered it via 5V pin 2 and ground and lo and behold! it works again. I just love these SBCs!

John Public

When I used the "regular" receiver that noise was far less, an occasional beep evry 10 secs or so. The superhet on other hand is just a constant stream of noise, ups and downs.
What about the amperage from a step down?

Search found 90 matches

I'd like to buy two RasberryPi 3+. Most place have it out of stock

hc-12 and Raspberry Zero - not getting /dev/ttyS0

Re: Monitor not showing anything

Monitor not showing anything

Re: 5v relay board and Raspberry zero

Re: 5v relay board and Raspberry zero

5v relay board and Raspberry zero

Re: Two new RPI3 ' won't boot at all

Re: Two new RPI3 ' won't boot at all

Two new RPI3 ' won't boot at all

Re: Having trouble setting GPIO high

Having trouble setting GPIO high

WiringPi in commercial projects?

Re: Reset Raspberry Pi from Arduino

Re: Reset Raspberry Pi from Arduino

Re: Reset Raspberry Pi from Arduino

Re: Turn night-time camera (noir-camera) camera to daylight camera

Re: Turn night-time camera (noir-camera) camera to daylight camera

Turn night-time camera (noir-camera) camera to daylight camera

Re: Read remote JPG and stream as MJPEG from the pi

Arduino -like "Serial plotter" (visual datalogger)

Re: Protection GPIO pins

Protection GPIO pins

Re: Power RPi3 from GPIO pins?

Re: step-up regulator, buck converter 5V->3.3V