Raspberry Pi Forums

amcdonley

For some reason "Screen Sharing" app from my Mac Mini (OS 10.12.6 Sierra) started reporting that that "version running on remote computer is incompatible with Screen Sharing". It seems like a crash had left some droppings in /tmp/.X11-unix/ To fix it, I did the following: ssh pi@...

amcdonley

On my robot, I use the 5v RPi for vRef (and VDD) on the 3008, and only level shift the DOUT (using r1.r2 divider) from the 3008. The I2CS, DIN, CLK from RPi (3.3v) go straight into the 3008 no problem, no level shift needed. When running the 3008 with 5v ref, there is no need to level shift your 0-5...

amcdonley

Thanks.

amcdonley

I've been running BOINC projects on my Pi3 at an average load of 2 and 70-74C, powered at 4.97v at the header for the last 18 days with no problems. I updated the OS last night, and rebooted, which started BOINC processing again. Roughly eight hours later, while showing the same load, temps, and vol...

amcdonley

Try check temperature and power status in each loop:

vcgencmd measure_temp
vcgencmd get_throttled

amcdonley

How should I interpret get_throttled=0x10000 or 0x30000 ? This post seems to imply under-voltage and throttling come together (I added hex views) 0: under-voltage (0xX0001) 1: arm frequency capped (0xX0002 or 0xX0003 with under-voltage) 2: currently throttled (0xX0004 or 0xX0005 with under-voltage) ...

amcdonley

Cool - Especially thank you for the one line opencv and all dependencies install. Somewhere I read about a book with 128 steps to follow to install OpenCV, so I have been putting off my initiation into OpenCV. I am running cam-track.py on Stretch upgraded from Jessie (using OS X remote desktop displ...

amcdonley

I added the LiFePO4wered/Pi3 UPS to my RPi3, along with the 15x15x15mm Adafruit heatsink and moved from a metal Flirc case to an acrylic case for the UPS and Pi3. My "boincstatus.sh script checks the temperature and throttled flags once every 10 seconds. I was seeing get_throttled would return ...

amcdonley

The GoPiGo robot pan_servo(angle) function puts 0 degrees facing left, 90 degrees straight ahead, and 180 to the right. (gopigo.py for rev 2.) If I understand the ROS Wiki correctly, ROS (and iRobot) put the robot frame X axis straight ahead, Z up), with positive angles turn left (from the x axis/fo...

amcdonley

mosespi wrote: MoPower UPS

I needed to study this puppy a bit. It looks good as a UPS, but 50ma charge rate won't get me 4000ma over night. Oh well, was hoping.

amcdonley

Thanks @mosespi - gives me some options and helps me understand how schottky diodes work.

amcdonley

Somewhere I saw an I2C Real Time Clock that could wake-up the RPi. I'll have to see if I can drive onto a recharging station, then shutdown with a scheduled "wake me up in four hours". If the bot shuts down right away, it might just work. I'll have to figure out if my Pololu SP power switc...

amcdonley

Good point - so perhaps a large Capacitor (or on the extreme the LiFePO4wered/Pi battery+charger) would isolate the load variation from the battery.

amcdonley

My RPi3 based robot is powered by 6 Ni-MH 5000mAh C-cells. I use a Tenergy 1025 "Smart" charger which auto detects that the nominal battery is 7.2v, charges at 2A using "negative delta-V" to detect when to switch to trickle charging. This all works wonderful IF my robot is shutdo...

amcdonley

The problem space is huge, and OpenCV is *THE* solution. We need to grow the number of people that understand how to apply OpenCV functions to basic vision problems.

There are no vision "components" yet, only tools for folks to build with.

amcdonley

My RPi3 robot is powered by six 5000mAH Ni-MH C-cells, and a Tenergy 1025 Smart Charger. Last weekend, when I plugged my bot in to recharge, the charger blinked "bad battery" condition. Two of the (year old) Tenergy C-cells were at 0 volts, while the other four cells read 1.1 volts. I had ...

amcdonley

What is the meaning/reason for the (45) in the "vcgencmd measure_clock arm" result?

frequency(45)=1200000000

amcdonley

Did you try their sample program ?? sudo apt-get install python-serial Then copy the following into an executable file and run it. #!/usr/bin/python import serial ser = serial.Serial('/dev/ttyAMA0', 38400, timeout=1) try: while 1: response = ser.readline() z = response.split(",") if len(z)...

amcdonley

Anyone integrated the new Dexter Industries laser "Distance Sensor" or the Adafruit VL53L0X Time-of-flight sensor to their robot? They both contain the VL53L0X laser "time of flight" sensor and interface via I2C. The "laser" beam and sensor acceptance cones are quite la...

amcdonley

Thanks for the heads up on einsteinathome.org - I added to my deskPi3 projects. I have been a part of SETI@Home since it started in 1999 and then WorldCommunityGrid. I just don't like having my computers powered off - weird but me. I have BOINC configured for 5GB disk, 80% of memory 70% of CPU time ...

amcdonley

What do your ultrasonic distance scans look like? Do you get wide variations in distance readings? Here is my "sample=30" run of us_servo_scan.py , (from GoPiGo), when placed 60 cm looking at a corner: tMap: ----------------------------------------------------------------------------------...

amcdonley

mattmiller wrote:You might want to consider using ArUco type markers to assist with its situational awareness

Wow - so cool. Thanks.

The markermapper from the same folks puts it all together. I am so pumped. I just need to retire, right now, to have the time to play with all this!

amcdonley

Lately I've been doing a lot of thinking about how best to raise my robot's intelligence level beyond basic motor skills. The need for this stems from my desire for the robot to be able to find its way back to a recharging station, to enable a more continuous robot "life" cycle. With the P...

amcdonley

This is a very apropos question for what I am doing - attempting to convert a robot written in Interactive C (on 68HC11) to Python (on Raspian Jessie). Interactive C had concepts of light weight "processes" and shared memory (even persistent across reboot shared memory) with hardware inter...

amcdonley

Then here is main(): def main(): startup() #prints some instructions. while True: print("Auto mode = ", AUTO) if AUTO == 1: auto_mode() elif AUTO == 0: print("auto mode is off") sleep(1) else: sys.exit() # just for testing purposes And here is auto_mode(): def auto_mode(): print...

Search found 198 matches

remote desktop from Mac to RPi "incompatible version"

Re: MCP3008, Voltage Divider and Pressure Transmitter

Re: Throttling 0x10000?

Throttling 0x10000?

Re: Raspi + L298N = Hang

Interpreting get_throttled=0x10000 or 0x30000

Re: cam-track.py Install - Wow!

LifePO4wered/Pi3, BOINC, and throttled=0x100000

tilt-pan servo reference directions?

Re: Can't Recharge While RPi Is On

Re: Can't Recharge While RPi Is On

Re: Can't Recharge While RPi Is On

Re: Can't Recharge While RPi Is On

Can't Recharge While RPi Is On

Re: Object and Feature Recognition

Robot Life on Ni-MH Batteries

frequency(45)?

Re: RPICT3 Temperature and Current Sensor

Laser Ranging Sensor (VL53L0X)

Re: Distributed Computing for BOINC

What does your Ultrasonic Scan look like?

Re: Using PiCam for situation awareness

Using PiCam for situation awareness

Re: Threads vs processes

Re: Selecting Autonomous and Manual Control