Go to advanced search

by cmatthews
Mon Jul 08, 2019 7:25 pm
Forum: Troubleshooting
Topic: Pi Zero W - Booting and working, but no ACT light
Replies: 5
Views: 173

Re: Pi Zero W - Booting and working, but no ACT light

I reckon the LED has failed. Low level prodding using the commands that you shared don't yield anything.

It's no big deal at the moment, but I haven't tested any of the other GPIO yet.
by cmatthews
Mon Jul 08, 2019 8:55 am
Forum: Troubleshooting
Topic: Pi Zero W - Booting and working, but no ACT light
Replies: 5
Views: 173

Re: Pi Zero W - Booting and working, but no ACT light

@Andyroo - Thanks again for taking time to respond. I will try the commands that you suggest later when I have the hardware to hand. The suggestion regarding the dtparam commands was actually really helpful because it got me digging around in the overlay README which isn't something that I have real...
by cmatthews
Sun Jul 07, 2019 10:50 pm
Forum: Troubleshooting
Topic: Pi Zero W - Booting and working, but no ACT light
Replies: 5
Views: 173

Re: Pi Zero W - Booting and working, but no ACT light

Thanks for the reply.

I just tried adding those lines to config.txt but no ACT light.

I don't see any flickering on shutdown.

Cheers,

Christian
by cmatthews
Sun Jul 07, 2019 9:58 pm
Forum: Troubleshooting
Topic: Pi Zero W - Booting and working, but no ACT light
Replies: 5
Views: 173

Pi Zero W - Booting and working, but no ACT light

I have a new Pi Zero W which is working, but the ACT LED never comes on. It did light up and flash the first time I booted it. Since then, through several successful reboots while setting it up, I get no activity light. Running the latest Rasbian Buster image. The board is new but has been sat in a ...
by cmatthews
Thu Aug 07, 2014 7:27 am
Forum: HATs and other add-ons
Topic: Gertduino & TinkerKit SensorShield
Replies: 5
Views: 6522

Re: Gertduino & TinkerKit SensorShield

The sensorshield works OK, it is just necessary to program the Gertduino without the shield in place. I never did get to the bottom of why this was the case. The Tinkerkit + Gertboard combination still offers a nice platform in terms of flexibility and ease of use, even with the slight inconvenience...
by cmatthews
Fri Mar 07, 2014 8:22 pm
Forum: HATs and other add-ons
Topic: AVRDUDE complains
Replies: 12
Views: 4857

Re: AVRDUDE complains

You shouldn't really have to, but it would seem that in some cases it causes problems if you dont. It seems that if the connected hardware has low input impedance then there can be issues.

Try uploading with nothing attached, then power down, reconnect hardware and power back up.
by cmatthews
Mon Mar 03, 2014 4:36 pm
Forum: HATs and other add-ons
Topic: AVRDUDE complains
Replies: 12
Views: 4857

Re: AVRDUDE complains

Do you have anything (shield, or other external HW) connected to the Gertduino during upload? There seems to be some circumstances where this makes a difference.
by cmatthews
Sun Mar 02, 2014 7:57 am
Forum: Advanced users
Topic: Pitch Roll Heave
Replies: 4
Views: 1227

Re: Pitch Roll Heave

marshallscott44 wrote:Getting and calculating heave are two very different tasks
Not sure what you mean, but if you come up with a motion sensor which will reliably and directly measure heave of a moving vehicle relative to a reference plane then let me know
by cmatthews
Sun Feb 23, 2014 10:53 am
Forum: Advanced users
Topic: Pitch Roll Heave
Replies: 4
Views: 1227

Re: Pitch Roll Heave

The MPU6050 would do pitch & roll directly. You would just need to integrate aZ Twice In softwaew to get heave.
by cmatthews
Mon Feb 10, 2014 11:28 pm
Forum: Advanced users
Topic: Raspberry Pi on battery
Replies: 2
Views: 883

Re: Raspberry Pi on battery

The screen that you linked requires 12v at 1000mA (i.e. 1Amp). You will therefore need a 12v battery which can output at least 1A, and I would not expect a Smartphone battery to fit that bill. You can buy Lithium Ion batteries which will do the job, but you need to understand what capacity is requir...
by cmatthews
Sun Feb 09, 2014 1:52 pm
Forum: Python
Topic: how to read & write a file
Replies: 1
Views: 485

Re: how to read & write a file

Yes it is certainly possible.

This will get you started: http://docs.python.org/2/tutorial/inputoutput.html

There are lots of other good examples out there too.
by cmatthews
Thu Feb 06, 2014 8:58 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2c is very slow....
Replies: 6
Views: 3154

Re: I2c is very slow....

I think you are just seeing the natural bandwidth limits of the module. It is designed for general purpose motion sensing and doesn't try to output data any faster than you seem to be reporting. It will be faster than 200Hz if you pick up raw values, but if you want processed values like integrating...
by cmatthews
Sat Feb 01, 2014 2:53 pm
Forum: Beginners
Topic: Sound triggered Camera Flash
Replies: 19
Views: 4693

Re: Sound triggered Camera Flash

You might be able to hack a remote flash trigger so that it is activated from a gpio port. Then use a usb microphone to pick up sound. Write some code which detects a spike in Sound level to activate the gpio.
by cmatthews
Fri Jan 31, 2014 8:41 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Attiny85 for analog input digital output, please help.
Replies: 9
Views: 4604

Re: Attiny85 for analog input digital output, please help.

In order to pass the analogue measurement from the ATiny to the raspberry pi over a single digital pin, you could use pulse width modulation with duty cycle representing the voltage value. The raspberry pi only has one hardware pwm channel (can't remember which pin it is on).
by cmatthews
Wed Jan 29, 2014 8:30 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 'Interference' between UART and I2C
Replies: 8
Views: 2021

Re: 'Interference' between UART and I2C

Thanks for taking time to check things out. I am supplying the Vin is at 5v, so will follow your advice and try 3.3v instead.

Christian
by cmatthews
Wed Jan 29, 2014 7:59 am
Forum: General discussion
Topic: Raspbian Kernel Headers
Replies: 3
Views: 564

Re: Raspbian Kernel Headers

I suggest that you Google 'Rasbian Kernel Headers' do some reading, follow some of the extensive guidance, and then come back with a less terse question if you get stuck.
by cmatthews
Wed Jan 29, 2014 7:52 am
Forum: General discussion
Topic: Mobile Power for Raspberry Pi?
Replies: 2
Views: 550

Re: Mobile Power for Raspberry Pi?

It looks like a nice little enclosure, but batteries are not included. How many 18650 batteries do you plan on installing inside?
by cmatthews
Sun Jan 26, 2014 6:24 pm
Forum: HATs and other add-ons
Topic: Shields
Replies: 2
Views: 1740

Re: Shields

The answer is yes, but in some cases you might see a problem where uploading code fails when the shield is plugged in. If this happens then there may be ways around it (e.g. powering the official Arduino Motor Shield fixes the problem in that case). An alternative is to remove the shield, upload the...
by cmatthews
Sun Jan 19, 2014 9:08 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 'Interference' between UART and I2C
Replies: 8
Views: 2021

Re: 'Interference' between UART and I2C

@danjperron - Thanks for the link, there is a 3.3v LDO regulator on the breakout board which I am feeding 5v from an adaptor. Do you think it could be that the existing regulator is letting me down?
by cmatthews
Sun Jan 19, 2014 4:57 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 'Interference' between UART and I2C
Replies: 8
Views: 2021

Re: 'Interference' between UART and I2C

Bypass Capacitors Tried 0.1uF capacitors between Vin and GND on the MPU6050 board (I2C) - No change Tried 0.1uF capacitor between Vin and GND on the GPS board (UART) - No change Tried 0.1uF capacitor bypass on both - no change 10k Pull-Ups Added 10k Pull-up to 3.3v for both SDA and SCL on MPU6050 - ...
by cmatthews
Sun Jan 19, 2014 10:21 am
Forum: C/C++
Topic: I2C in C++
Replies: 5
Views: 4687

Re: I2C in C++

You might find that WiringPi meets your needs: http://wiringpi.com
by cmatthews
Sun Jan 19, 2014 9:46 am
Forum: Off topic discussion
Topic: Writing iOS apps to communicate with RPi
Replies: 6
Views: 6849

Re: Writing iOS apps to communicate with RPi

iSSH on iOS works well with the RPi. It gives you a fully featured SSH client with the capability of rendering x11 if forwarding is used.
by cmatthews
Fri Jan 17, 2014 9:10 am
Forum: Python
Topic: installing some libraries on python
Replies: 5
Views: 8259

Re: installing some libraries on python

This might help get you started with the math/science libraries

http://www.scipy.org/install.html
by cmatthews
Fri Jan 17, 2014 9:08 am
Forum: Python
Topic: installing some libraries on python
Replies: 5
Views: 8259

Re: installing some libraries on python

Example:

Code: Select all

sudo apt-get install python-scipy
Same will be true for others, but you need to find out what the packages are called. Most will probably be of the form

Code: Select all

python-<library>
by cmatthews
Thu Jan 16, 2014 8:38 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 'Interference' between UART and I2C
Replies: 8
Views: 2021

Re: 'Interference' between UART and I2C

Thanks for the suggestions, will check out both avenues.

Go to advanced search