Quoi de neuf 2017
From Eric
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* [[Quoi de neuf 2011 | 2011]] | * [[Quoi de neuf 2011 | 2011]] | ||
| + | == August 2017 == | ||
| + | * 15/08/2017 | ||
| + | ** Painful investigations about RTOS on the Raspberry Pi. Tried Xenomai, FreeRTOS and RTEMS. Nothing runs really "out of the box". Some notes (in french) are available [https://1drv.ms/w/s!AuATPoIeeSgFk8hsuDnJoW0mOKhXcA, here]. | ||
| + | ** I have received the PCB for the LT2944 breakout board from OSH Park: [File:ltc2944_pcb.jpg|400px|thumb|none]] Now I have to solder the very very small guy... | ||
== July 2017 == | == July 2017 == | ||
| - | |||
* 30/07/2017 | * 30/07/2017 | ||
** Playing with the [http://www.linear.com/product/LTC2944 LTC2944] Coulomb counter from Linear Technology. This chip is used as a "fuel gauge" for battery-powered equipments. Here is a picture of the thing: [[File:lptc2944.jpg|400px|thumb|none]][[File:ltc2944_closer.jpg|400px|thumb|none]]Pretty small, isn't it?[[File:ltc2944_all.jpg|400px|thumb|none]] | ** Playing with the [http://www.linear.com/product/LTC2944 LTC2944] Coulomb counter from Linear Technology. This chip is used as a "fuel gauge" for battery-powered equipments. Here is a picture of the thing: [[File:lptc2944.jpg|400px|thumb|none]][[File:ltc2944_closer.jpg|400px|thumb|none]]Pretty small, isn't it?[[File:ltc2944_all.jpg|400px|thumb|none]] | ||
Revision as of 07:13, 19 August 2017
Experiments carried out in the past (from 2011) are described hereafter:
Contents |
August 2017
- 15/08/2017
- Painful investigations about RTOS on the Raspberry Pi. Tried Xenomai, FreeRTOS and RTEMS. Nothing runs really "out of the box". Some notes (in french) are available here.
- I have received the PCB for the LT2944 breakout board from OSH Park: [File:ltc2944_pcb.jpg|400px|thumb|none]] Now I have to solder the very very small guy...
July 2017
- 30/07/2017
- Playing with the LTC2944 Coulomb counter from Linear Technology. This chip is used as a "fuel gauge" for battery-powered equipments. Here is a picture of the thing:
Pretty small, isn't it?
- I have "designed" a small PCB to make it easier to play with it (currently, I am using LT demonstration board connected to an Arduino). I should receive the actual PCB (from Osh Park) soon:
- The Arduino code can be found here, and the Python script to display the sensors' values can be found here.
- Playing with the LTC2944 Coulomb counter from Linear Technology. This chip is used as a "fuel gauge" for battery-powered equipments. Here is a picture of the thing:
- 15/07/2017
- I have built an ESR meter. The design comes from Jay_Diddy_B, see 5 transistor ESR meter design. Explanations are given in W2AEW blog (excellent video as usual, higly recommended blog)
- I have built an ESR meter. The design comes from Jay_Diddy_B, see 5 transistor ESR meter design. Explanations are given in W2AEW blog (excellent video as usual, higly recommended blog)
- 14/07/2017
- I have installed a bunch of NeoPixels (WS1812) in one of these old optic fiber lamps. To drive the pixels, I have simply used an Arduino pro mini with the AdaFruit NeoPixel library. The result is pretty nice.
- I have built a Joule thief (a LED, a 2N2222 and a toroid self).
- I have installed a bunch of NeoPixels (WS1812) in one of these old optic fiber lamps. To drive the pixels, I have simply used an Arduino pro mini with the AdaFruit NeoPixel library. The result is pretty nice.
- 02/07/2017
- I have bought a small 3D printer, the Trinus3D:
- I have printed the small Bulbasaur that was pre-loaded on the SD card:
- I have bought a small 3D printer, the Trinus3D:
June 2017
- 25/06/2017
- I have tried my little thermal printer :
- I have used the library developed by Adafruit to print bar codes, and the library developed by grintor to print QR-Code. I read the QR codes with my mobile phone using Lightning scanning QR. Works pretty well. The printer user manual can be found here.
- To generate and print QR-codes on my PC, I use QR Code studio.
- I have tried my little thermal printer :
- 24/06/2017
- I have managed to use the fantastic DWM1000 chip:
- [Edit 14/07] It seems that I have destroyed one or twop of these bests. Curiously, only DWM playing the role of TAGs seem to fail... Investigations are ongoing.]
- This chip, manufactured by Decawave can be used for in-door localization. It is based on the measurement of the time of flight of radio waves.
- I have used small Arduino pro mini at 3.3V to drive the chips. Hopefully, all the dirty work has been done by Thotro who provides a nice librabry, see here and there, on GitHub.
- To solder the chip, I use a breakout board designed by Wayne and manufactured on demand by OSH park.
- One VERY important thing to now: the power supply must be strong enough to support the peak current demands of the DWM1000. If the power supply is too weak, it will work very erratically. By the way, if you use one of those small breadboard power supply, do not forget to add a LARGE CAPACITOR (see the pictures).
- Up to now, I only use the existing library which gives me 3 distances. Now, I have to implement some smart trilateration algorithm.
- Here is a picture of the 3 "anchors" and the tag:
- I have managed to use the fantastic DWM1000 chip:
May 2017
Nada.
April 2017
Nothing.
March 2017
Void.
February 2017
Empty set.
January 2017
Null.
