Raspberry Pi Forums

AndersM

Thanks!

AndersM

I just upgraded the PI and had forgotten about the Wi-fi driver problem. If I had remembered I should have avoided the upgrade... Now running install-wifi I get: Your current kernel revision = 4.9.80-v7+ Your current kernel build = #1098 Checking for a wifi module to determine the driver to install....

AndersM

In the second, the gate will only be pulled low if the right-hand transistor is off, which will only happen if the left-hand transistor is on, which in turn will only happen if the input voltage is the same as or higher than the output voltage. Thus, current can only flow in one direction, which is...

AndersM

At the top left corner of the schematic of the Pi https://www.raspberrypi.org/documentation/hardware/raspberrypi/schematics/Raspberry-Pi-3B-V1.2-Schematics.pdf is an "ideal diode" It has the advantage of almost no voltage drop. So if you wish to go for a much more complicated solution, build two of...

AndersM

its never a good idea to connect a discharged battery to a charged battery as high currents can end up flowing between the 2 batteries, you may also see voltage spikes when doing this. Yes, these are kind of complications I anticipated. I thought it might require some circuitry including maybe a la...

AndersM

Hi! I'm planning to use a raspberry pi to collect sensor data for a couple of days, approx. 3*24h. I have to run the Pi on batteries. I have a number of power-packs (5V USB 7800 mAh) and can switch batteries a few times a day. What is the best set up to make it possible to continuously run the Pi an...

AndersM

The script worked like a charm!
Mr. Engman you're a life saver!

AndersM

As Pi Camera is small I thought it would be fun to play with stop motion animation. (The youngest son is in the LEGO-animation age...) Having OpenCV3 installed I made a small python program for recording animations. It can handle camera up side down (it is easier to get low down that way) and overla...

AndersM

Anders you are a genius :D thank you for taking the time to think about it. I've adopted your second idea and it works ... Thanks :) with one small flaw. When it works out the average position it gets it wrong when the difference is greater than 180 degrees, e.g. when one is 315 and another is 45, ...

AndersM

Oracle can.

AndersM

You have 1 second delay when the program starts before the GPIO pin 38 is set to input. Then you have 1 second between each new round in the loop. That means that the GPIO pin is checked every second but that the first check is made directly after setting the pin. If you want to have a delay before ...

AndersM

I like the idea of using a recording flag and acting on the release of the button. when the recording is set to true/false I assume i need to use that elsewhere in the code? i.e add a 'camera.stop_recording()' Second thoughts: Since you would like to keep the with picamera.PiCamera() as camera: sta...

AndersM

Might have misunderstood your code but it looks like: a) If you press Rec button more than half a second when pressing it to stop the recording it will restart the recording as it returns to the choice-loop with the Rec button down. b) The program is stuck on the line GPIO.wait_for_edge(17, GPIO.FAL...

AndersM

I had a frustrating time not getting the IMU to work when I first tried. Then I found out that my problem was a polling issue.
See this thread. Could this be the issue here too?

AndersM

Thought a little more. If two active sensors means that the target is in between the two sensors you can us the fact that Python uses True=1 and False=0 to calculate the target angle: angle=0 while True: inN=GPIO.input(IR_N) inNE=GPIO.input(IR_NE) ... inNW=GPIO.input(IR_NW) try: angle= ((360*(inN an...

AndersM

If the code is the exact code in your program there are errors in the syntax of the lists: Remove the last , image_1 = [ o,o,x,x,x,x,o,o, o,o,x,x,x,x,o,o, o,o,x,x,x,x,o,o, o,o,x,x,x,x,o,o, o,x,x,x,x,x,x,o, x,o,o,o,o,o,o,x, x,o,o,o,o,o,o,x, x,x,o,o,o,o,x,x, ] Remove the last , and add a closing ] ima...

AndersM

Could you calculate the position first and then signal the motor? If the PIR just signals active/inactive a solution like this could be possible: *Generate a number by adding the active sensors together with the sensors being numbered N 1, NE 2, E 4, SE 8, ... NW 128. *Use the generated number to fi...

AndersM

Hm ... how do I turn it on again?

The lack of on/off switch is a bit annoying.

AndersM

Use a while loop.

An infinite loop:
Basic

Code: Select all

10 do things
20 goto 10

Python

Code: Select all

while True :
     do things

AndersM

I need someway to have the sensehat run a shutdown command since it will be run headless Have you tried this new stick class ? EDIT: Made a test script called stickpoweroff.py based on the new class: from sense_hat import SenseStick import os stick = SenseStick() for event in stick: if event.key ==...

AndersM

CSV is read by most analysing software

AndersM

I practically always use a thread for serial communication. This way is not on the main loop and it could be asynchronous. I made a small "pong" game to test my analog input using a separate thread for reading the input. It works fine so I will continue down that path. #!/usr/bin/env python import ...

AndersM

One possibilty could be to change the python program you want to run so it waits until a gpio signal is read to execute the main task, and then goes back into waiting for a new gpio-input.

AndersM

Interesting! ... but a bit over my head

AndersM

The marker idea seems good for avoiding partial data loss due to input flush. But now I'm thinking of moving the serial input read to a separate thread so that this thread will be reading at least as fast as the tiny is writing. Then have the reading thread updating the input variable in the main pr...

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