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91
General topics / Re: Motion Mote
« Last post by Felix on May 04, 2023, 01:26:25 PM »
The older revision with Moteino as a breakout that plugs into it was able to charge the LiPo battery by just connecting the USB.
That MotionMote revision is no longer available.
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General topics / Motion Mote
« Last post by alexsh1 on May 04, 2023, 12:30:32 PM »
Hi Felix,

The Motion Mote in the old format, where I can re-charge the battery and program it without dismantling, are they going to be available?

Thanks
Alex
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CurrentRanger / Re: Feature request
« Last post by Felix on April 29, 2023, 12:01:26 PM »
Matt, thanks very much for your contribution, I am sure someone will find it very useful!
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CurrentRanger / Re: Feature request
« Last post by mattgaidica on April 26, 2023, 10:08:34 AM »
I just wrote a blog post with some code to enable this, albeit with some caveats that Felix has identified. It is definitely helping me characterize some different power modes in a low-power device very rapidly, and then estimate battery lifetime (which is my big concern).

Modifying Current Ranger to Estimate Battery Life
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CurrentRanger / Re: Same DUT, Different Measurements with Different Hookup Wires
« Last post by Felix on April 26, 2023, 07:48:31 AM »
You're probably seeing the effects of voltage drop over weaker wiring and more loose connections that act as higher resistance.
So then by the time the CR sees this voltage has already dropped a bit over all those interconnects.
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Moteino / Re: Curious why Moteinos don't have SS Pullups Built In
« Last post by Felix on April 26, 2023, 07:45:28 AM »
Because a lot of Moteinos are used without SPI/radio module.
Yes, if you know you will have the SPI always, then the pullup won't hurt to have.
Although the programming jig can have that. In real use the pullup is not needed. So it feels a bit redundant once you get past ISP programming.
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CurrentRanger / Same DUT, Different Measurements with Different Hookup Wires
« Last post by brandock on April 24, 2023, 01:54:50 PM »
Hoping someone can explain this to me.

I created a breakout for my CurrentRanger (attached) with a USB micro female receptacle on one side, and USB A female on the other. GND is connected to GND. VIN and VOUT are not connected to each other. Instead they are broken out by plated holes where I can connect my CurrentRanger to the source and the load. (I went for a little fun and tried to make the breakout actually look like it is being broken.)

OSHPark sent me three copies, as they do.

To copy 1 I soldered IC test clips and attached the LPL Shop banana plugs. https://lowpowerlab.com/shop/product/183

To copy 2 I soldered female headers and attached Dupont male-male connectors, with the other ends clipping into the green thumb terminals.

I measured the current used by one of my projects. With setup 1 (banana plugs) I was reading (if memory serves) 50-60 mA. With setup 2 (Dupont wire) I was reading (if memory serves) about 32 mA.

Question: is this a known thing that the hookup to the DUT can make such a difference in the readings? Or is something else going on that I should look into in my setup?

98
Moteino / Curious why Moteinos don't have SS Pullups Built In
« Last post by brandock on April 24, 2023, 01:37:29 PM »
Recently I accidentally loaded firmware without a bootloader into a Moteino. I used ISP to recover it. While doing so I learned about using a pullup on SS to prevent the radio from interfering with ISP.

For example:
Also, if you do have a radio and flash memory, then you should have pullup resistors on pins 8 (Flash SS) & 10 (Radio SS) when programming via ISP interface.

My question: why not have these resistors on the Moteino as part of the board?

I've been designing a PCB with an onboard RFM transceiver and an ISP header. I am using pin 10 for Radio SS. In my design I have a Radio SS pullup resistor on the board that can be enabled with a jumper, to enable ISP. I could just as well leave it connected at all times, correct? Seems to work fine in my breadkboard tests.

But then I am wondering - why wouldn't Moteinos have any such pullup onboard? Little expectation of needed to use ISP? Space considerations? Just curious as I think about my PCB design. Thanks.
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ATXRaspi / Re: Challenges setting GPIO values
« Last post by tpellegrini on April 18, 2023, 07:14:23 PM »
OK, I finally figured out my issue.

At some point and for some reason, I had enabled SPI. I have now learned after reading hundreds of pages/blog posts that SPI conflicts with the "base" GPIO functionality. When enabled, SPI "takes ownership" of the GPIO pins assigned, which includes the pins used in the example for the ATXRaspi poweroff from software page. GPIO7, GPIO8, and GPIO10 have specific SPI functionality, so when I unwittingly enabled SPI, I effectively "repurposed" those pins to SPI and OUT OF GPIO control. The simple fix, therefore, was to disable SPI via raspi-config, after which full functionality was restored. I'm sure I could also have selected different GPIO pins that were not conflicting with the SPI assignments, but that would have involved disassembly of the components which I knew was not necessary since the system had been working previously.

Not for anything, but an asterix/footnote on the web page detailing the ATXRaspi configuration for software control would be helpful for others like me who are not so well versed in these sorts of things.

Hopes this helps others in need.

100
Pi Gateway / Re: Reached heap limit Allocation failed - JavaScript heap out of memory
« Last post by Felix on April 16, 2023, 08:04:57 PM »
That's strange, how large was that database at time of compaction?
Compacting it more often would probably be the best approach.
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