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by gregeric
Tue Mar 14, 2017 2:41 pm
Forum: General discussion
Topic: Pi Zero official case
Replies: 14
Views: 3162

Re: Pi Zero official case

It is well held in the case - deliberately so I'd say, so that you can unplug a HAT from it whilst still housed in the case. rpdom described the procedure already, but: 1. Hold the case with your right thumb over the long edge with the HDMI and USB sockets, with the exposed Zero PCB facing you. 2. N...
by gregeric
Tue Mar 14, 2017 11:53 am
Forum: HATs and other add-ons
Topic: PaPirus functions
Replies: 3
Views: 992

Re: PaPirus functions

This device tree install of the on-board LM75 temp sensor's linux kernel driver may be of interest too.
by gregeric
Tue Mar 14, 2017 11:17 am
Forum: Automation, sensing and robotics
Topic: LM75 Temp Sensor Help
Replies: 2
Views: 2326

Re: LM75 Temp Sensor Help

Thanks for that!

The PaPiRus HATs include an LM75, so this is useful to owners of those boards.
by gregeric
Mon Mar 13, 2017 10:46 pm
Forum: General discussion
Topic: Possible to read Pi Zero [W] input voltage?
Replies: 12
Views: 5624

Re: Possible to read Pi Zero [W] input voltage?

Good find. I'm wondering what else might an ADC be useful for on a mobile phone SoC.

JTAG might not be a necessity to investigate - you can painlessly inject custom VC4 code to probe those registers over USB. See viewtopic.php?f=72&t=130777&hilit=+easy
by gregeric
Sun Mar 12, 2017 10:00 pm
Forum: Beginners
Topic: Pi Zero W, official case and camera
Replies: 5
Views: 1436

Re: Pi Zero W, official case and camera

Yeah, MrEngmans's picture shows the correct orientation of everything, but for the life of me I cannot get the camera PCB to clip in behind those detents on the tabs to the left or right- its just sits there at one wonky angle or another.
by gregeric
Sun Mar 12, 2017 9:32 pm
Forum: General discussion
Topic: Pi Zero, all I see is an unknown device called BCM2708 Boot
Replies: 27
Views: 11236

Re: Pi Zero, all I see is an unknown device called BCM2708

wayne.dolesman wrote:gregric thanks for the forum post that talks about this and gives the same instructions the github repo contains.
No worries wayne. It's been a day or so, and none of the mob that defamed you have been back here to apologise - sad.
by gregeric
Sun Mar 12, 2017 9:11 pm
Forum: Beginners
Topic: placement of resistor in circuit
Replies: 19
Views: 3026

Re: placement of resistor in circuit

mahjongg wrote:I think we have had enough confusion over such a simple question
All the same, I would prefer that you would remove your spurious, erroneous quoted reference to me with your "lesson 1, class 1" instruction.
by gregeric
Sun Mar 12, 2017 4:09 pm
Forum: Beginners
Topic: placement of resistor in circuit
Replies: 19
Views: 3026

Re: placement of resistor in circuit

Not sure why you quoted me there mahjongg, I think your lesson is better directed at Dougie.
by gregeric
Sat Mar 11, 2017 8:04 pm
Forum: General discussion
Topic: Possible to read Pi Zero [W] input voltage?
Replies: 12
Views: 5624

Re: Possible to read Pi Zero [W] input voltage?

They put a APX803 4.6v detector on the B+, this suggests it may not work. Or maybe not good enough for 5V detection? Good point - that might indicate that there is no undocumented/unused Vbatt measuring feature in the BCM2835, but there again, the B+ was designed with full knowledge that the Pi2 wa...
by gregeric
Sat Mar 11, 2017 5:36 pm
Forum: Beginners
Topic: placement of resistor in circuit
Replies: 19
Views: 3026

Re: placement of resistor in circuit

Yes, precisely, so your resistor will dissipate a little more power as heat, but still feebly warm, and most definitely will not emit smoke mimicking an e-cig as you stated.
by gregeric
Sat Mar 11, 2017 5:15 pm
Forum: Beginners
Topic: placement of resistor in circuit
Replies: 19
Views: 3026

Re: placement of resistor in circuit

If its value had been correctly selected for an appropriate LED current (something like 1K), but mistakenly placed like that, it won't get noticeably hot at all.

It's the LED, as mahjongg has stated, which will cause problems for itself &/or the Pi.
by gregeric
Sat Mar 11, 2017 9:06 am
Forum: General discussion
Topic: Pi Zero, all I see is an unknown device called BCM2708 Boot
Replies: 27
Views: 11236

Re: Pi Zero, all I see is an unknown device called BCM2708

The Device Boot section on that first link is an empty holding page, but there's more info on device/slave boot at the end of https://github.com/raspberrypi/usbboot and gsh mentions it here too: https://www.raspberrypi.org/forums/viewtopic.php?f=98&t=171975&p=1101183&hilit=rpiboot#p1101595 Not for t...
by gregeric
Sat Mar 11, 2017 7:53 am
Forum: General discussion
Topic: Pi Zero, all I see is an unknown device called BCM2708 Boot
Replies: 27
Views: 11236

Re: Pi Zero, all I see is an unknown device called BCM2708

Wayne is correct, it wasn't inaccurate: that's the message the bcm2835 gives during the first stage of its USB slave boot. Indeed it can boot linux that way, no SD card at all, but requiring a computer on the other end of the cable, not mass storage. But that's not what the OP is after here I suspec...
by gregeric
Fri Mar 10, 2017 9:11 pm
Forum: Troubleshooting
Topic: LED Latency Issue
Replies: 12
Views: 1802

Re: LED Latency Issue

It's possible to start raspivid (& raspistill) in paused mode with the -s parameter. Sending a SIGUSR1 to it will then toggle it record/pause. That might give you better control & timing. Here are some snippets to start you off with that approach - all bash scripts which you can call with your pytho...
by gregeric
Fri Mar 10, 2017 9:17 am
Forum: C/C++
Topic: GPIO led blink like network link/activity led
Replies: 7
Views: 4017

Re: GPIO led blink like network link/activity led

My led triggers look like this (Pi Zero with wlan0 up and running): cat /sys/class/leds/led0/trigger none kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock [mmc0] mmc1 timer oneshot hear...
by gregeric
Fri Mar 10, 2017 9:07 am
Forum: Raspberry Pi OS
Topic: apt-get install raspberrypi-kernel-headers
Replies: 2
Views: 879

Re: apt-get install raspberrypi-kernel-headers

Code: Select all

uname -r
ls /usr/src/
by gregeric
Thu Mar 09, 2017 9:24 pm
Forum: Beginners
Topic: Record Audio via GPIO
Replies: 8
Views: 5557

Re: Record Audio via GPIO

That Adafruit i2s mic breakout will most definitely work.

It's not an ICS43432, but driver-wise the i2s MEMS mics are all pretty much the same, so I'm pretty sure it will work if you follow my instructions directly: viewtopic.php?f=44&t=173640
by gregeric
Thu Mar 09, 2017 6:19 pm
Forum: Other projects
Topic: Looking for Zero case with space for hats/expansion
Replies: 4
Views: 2138

Re: Looking for Zero case with space for hats/expansion

Bonnets/pHATs seem to plug nicely on top of the Zero when placed inside inside the new, official case. The Zero is housed, but the bonnet/pHAT not.
by gregeric
Thu Mar 09, 2017 9:19 am
Forum: Other projects
Topic: Looking for Zero case with space for hats/expansion
Replies: 4
Views: 2138

Re: Lokking for Zero case with space for hats/expansion

If you're using the Zero with a full-sized HAT then a case designed for the model A+ might prove suitable.
by gregeric
Wed Mar 08, 2017 10:07 pm
Forum: General discussion
Topic: Possible to read Pi Zero [W] input voltage?
Replies: 12
Views: 5624

Re: Possible to read Pi Zero [W] input voltage?

You do have to wonder whether there is some such voltage monitoring buried somewhere in the 2835 SoC, as that has on-chip core voltage regulator & Vbat input in the range 2.5-5V If, like me, you are powering the Zero directly from LiPo, you can implement low-battery signalling (shutdown now!) at say...
by gregeric
Wed Mar 08, 2017 9:44 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: bcm2708-rpi-0-w.dts has no property/override for pwr led
Replies: 4
Views: 948

Re: bcm2708-rpi-0-w.dts has no property/override for pwr led

Issue clarified by PhilE on github: https://github.com/raspberrypi/linux/issues/1886

I shouldn't be hacking the pwr or act leds for my own purposes: better to create a custom led by way of device tree/overlay.
by gregeric
Wed Mar 08, 2017 7:23 pm
Forum: Troubleshooting
Topic: USB ports not grounded?
Replies: 31
Views: 6460

Re: USB ports not grounded?

all metal shell connectors of any PI (USB, HDMI Ethernet) are always electrically connected to the main ground plane of the PI. [slightly off-topic]except for the camera connector lugs on the Zero 1.3 & W. I know there are proper ground points aplenty, but the end result of my literal wiring shortc...
by gregeric
Tue Mar 07, 2017 12:38 pm
Forum: General discussion
Topic: Inside Pi0W
Replies: 15
Views: 5076

Re: Inside Pi0W

Here's Giles Read's x-ray shot of the ZW: https://www.flickr.com/photos/ultrapurple/33224746775/
by gregeric
Tue Mar 07, 2017 10:41 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: bcm2708-rpi-0-w.dts has no property/override for pwr led
Replies: 4
Views: 948

Re: bcm2708-rpi-0-w.dts has no property/override for pwr led

I'll head over to github. As a workaround, I created my own pwr_led overlay: /dts-v1/; /plugin/; /{ compatible = "brcm,brcm2835"; fragment@0 { target = <&leds>; __overlay__ { compatible = "gpio-leds"; pwr_led:pwr { label = "led1"; linux,default-trigger = "heartbeat"; gpios = <&gpio 1 0>; }; }; }; };...
by gregeric
Mon Mar 06, 2017 6:27 pm
Forum: Troubleshooting
Topic: Pi0W and bluetooth speaker ?
Replies: 23
Views: 5558

Re: Pi0W and bluetooth speaker ?

I'm using this http://www.ebay.co.uk/itm/2x3W-Bluetooth-Audio-Receiver-Digital-Amplifier-Module-Board-for-Speaker-TE657-/162314698311?hash=item25cab5be47:g:HxEAAOSwB09YSwQx. No plug is supplied to fit the onboard speaker socket, but I got lucky in that the speakers I salvaged from Samsung LED TVs ha...

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